Page 1 Instruction Manual 1705A Spectrum Monitor (SN B040000 and Above) 070-8222-08 Warning The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so. Refer to all safety summaries prior to performing service.
Page 2: Table Of Contents
Optional Accessories Safety Information ELECTRICAL SPECIFICATION APPLICATIONS Locating Satellites Satellite Footprints Using the 1705A for Satellite Communication L- - Band Input Signals Zeroing in on a Satellite Locating the Satellite Identifying the Satellite Finding The Correct Transponder Optimize Signal Strength...
Page 3 4- - 3 4- - 3 4- - 3 4- - 4 4- - 4 4- - 4 4- - 4 4- - 5 4- - 5 4- - 5 4- - 6 4- - 6 4- - 7 1705A Spectrum Monitor...
Page 4 Adjustment Procedure 1705A Spectrum Monitor ........... . .
Page 5 ..... . 6- - 25 6- - 26 6- - 27 7- -1 7- - 1 7- - 1 7- - 2 1705A Spectrum Monitor...
Page 6 Cross Index- - Mfr. Code Number to Manufacturer Abbreviations List of Assemblies Column Descriptions Component No. (Column 1) Tektronix Part No. (Column 2) Serial/Assembly No. (Column 3 and 4) Name and Description (Column 5) Mfr. Code (Column 6) Mfr. Part No. (Column 7)
Page 7: List Of Figures
Figure 1-9: Up link Video Exciter, Up converter, and High Power Amplifier (HPA) showing how to hook up a 1705A Spectrum Monitor to look at the Video Exciter output Figure 1-10: 1705A hooked up to look at either the output of the Video Exciter (70 MHz) or the Receiver Input (L-Band)
Page 8 Figure 3-8: Considerations for custom installation of an instrument Figure 4-1: 1705A L- -Band comb display showing the areas each of the six sweep shaper variable resistors adjust Figure 4-2: Output duty cycle of the pulse width modulator used in the +18 V Power Supply...
Page 9: List Of Tables
............... 1705A Spectrum Monitor 1- -4...
Page 10: General Safety Summary
Do Not Operate With Suspected Failures. If you suspect there is damage to this product, have it inspected by qualified service personnel. Do Not Operate in Wet/Damp Conditions. Do Not Operate in an Explosive Atmosphere. Keep Product Surfaces Clean and Dry. 1705A Spectrum Monitor...
Page 11: Symbols And Terms
CAUTION indicates a hazard to property including the product. Symbols on the Product. The following symbols may appear on the product: Double CAUTION WARNING Protective Ground Not suitable for Insulated Refer to Manual High Voltage (Earth) Terminal connection to the public telecom- munications network 1705A Spectrum Monitor...
Page 12: Service Safety Summary
To avoid electric shock, do not touch exposed connections. X-Radiation. To avoid x-radiation exposure, do not modify or otherwise alter the high-voltage circuitry or the CRT enclosure. X-ray emissions generated within this product have been sufficiently shielded. 1705A Spectrum Monitor...
Page 13 Service Safety Summary 1705A Spectrum Monitor...
Page 14: Preface
The procedures are preceded by a list of recommended test equipment. Each procedure has a short form listing of the individual steps. Section 6, Maintenance Section 6, Maintenance, includes preventive, troubleshooting, and corrective information. 1705A Spectrum Monitor xiii...
Page 15 Section 10, Replaceable Mechanical Parts, includes ordering information and Mechanical Parts part numbers for all replaceable mechanical parts. This parts list is referenced to an exploded view mechanical drawing. Also included are lists of accessories and optional accessories. 1705A Spectrum Monitor...
Page 16: Contacting Tektronix
6:00 a.m. - - 5:00 p.m. Pacific time This phone number is toll free in North America. After office hours, please leave a voice mail message. Outside North America, contact a Tektronix sales office or distributor; see the Tektronix web site for a list of offices. Preface...
Page 17 Preface 1705A Spectrum Monitor...
Page 18: Section 1 Introduction
Introduction...
Page 20: Typical Configurations
Section 1 Introduction The TEKTRONIX 1705A Spectrum Monitor is an 8½” wide by 5¼” high special purpose spectrum analyzer. It weighs approximately 8½ pounds and is powered from an ac source. The crt occupies approximately two-thirds of the front-panel area, with the control panel taking up the remainder of the space.
Page 21: Options
Introduction Figure 1-1: 1705A used to locate satellites and determine maximum signal level Options The only options currently available for the 1705A Spectrum Monitor are the power plug options described in Section 7 (Options). If no power cord options are ordered, instruments are shipped with the North American 125 V power cord and one replacement fuse.
Page 22: Optional Accessories
The instrument was tested for compliance in a cabinet. To ensure continued compliance, the instrument will need to be enclosed in a cabinet that is equiva- lent to those listed as Optional Accessories for the 1705A. A drawing of the 1700F00 plain cabinet is contained in the Installation Instructions (Section 3).
Page 23: Electrical Specification
Center Frequency shown by time sharing graphic readout. Exact posi- tion on the trace of the center frequen- cy shown by a caret in all spans except FULL. Check Step 4, 5, 10, 11 Line Edge 1400 1900 1705A Spectrum Monitor...
Page 24: Table 1- 2: Crt Display
Graticule Table 1- 3: Power Source Characteristic Mains Voltage Range Mains Frequency Range Power Consumption 1705A Spectrum Monitor Performance Requirements Supplemental Information Full Span has bright up and frequency readout (without cursor). Bright-up area will be on screen in at least the next narrower span.
Page 25: Table 1- 4: Environmental Characteristics
IEC 801-4 Electrical Fast Transient/Burst Immunity High-quality shielded cables must be used to ensure compliance to the above listed standards. This product complies when installed into any of the following Tektronix instrument enclosures: 1700F00 Standard Cabinet 1700F02 Portable Cabinet 1700F05 Rack Adapter...
Page 26 Low Voltage Directive 73/23/EEC, amended by 93/69/EEC EN 61010-1 Additional Compliance IEC61010-1 1705A Spectrum Monitor Distribution-level mains (usually permanently connected). Equipment at this level is typically in a fixed industrial location. Local-level mains (wall sockets). Equipment at this level includes appliances, portable tools, and similar products.
Page 27 Class 1 (as defined in IEC 1010-1, Annex H) - - grounded product Overvoltage Category Overvoltage Category II (as defined in IEC 1010-1, Annex J) Pollution Degree Pollution Degree 2 (as defined in IEC 1010-1). Note: Rated for indoor use only. 1- 8 1705A Spectrum Monitor...
Page 28: Applications
APPLICATIONS The principal application for the TEKTRONIX 1705A Spectrum Monitor is to provide a convenient method to locate and identify Ku-Band satellites, find the correct transponder and check on its availability, and optimize antenna position- ing and polarization. The remainder of this section provides basic satellite communications application data.
Page 29: Satellite Footprints
United States. With each of these beams there are areas where the signal strength is greater. Figure 1-5 shows a propagation map for the western spot beam for one Ku- -Band satellite. 1- 10 45° N 00° (EQUATOR) SATELLITE EARTH 1705A Spectrum Monitor...
Page 30: Using The 1705A For Satellite Communication
North American continent and Hawaii Using the 1705A for Satellite Communication The 1705A has two separate inputs, one, the L- -Band Input, is specifically designed to work with LNB down converters, which have an output signal range of 0.95 to 1.80 GHz.
Page 31: L- Band Input Signals
1705A display. As it is shipped from the factory the 1705A provides a readout in MHz for both bands. However, the 1705A has several customizing routines that can be used to tailor displays for ease of operation.
Page 32: Zeroing In On A Satellite
Zeroing in on a Satellite In almost all cases a set procedure for Locating, Identifying, Finding (transpond- ers), and Optimizing will be followed. The 1705A Spectrum Monitor is a tool that greatly simplifies the individual steps so the correct satellite transponder can be accessed in the minimum time.
Page 33: Figure 1-6: A Computer Representation Of The 1705A Display Showing The 12.198 Ghz
Introduction Figure 1-6: A computer representation of the 1705A display showing the 12.198 GHz horizontally polarized telemetry beacon on the SATCOM K2 satellite (Span/Div set to 100 kHz with a 10 kHz Resolution filter) Transponder Polarization. Whether one or two polarizations are used can often be an easy way to identify a satellite.
Page 34: Horizontal Polarization
Once the satellite has been found it will be necessary to find the proper trans- Transponder ponder and determine if it is available. With the 1705A frequency readout offset correctly set up, it is possible to directly zero in on the correct transponder.
Page 35: Looking At Exciters With The 70 Mhz Input
Introduction Figure 1-8: Simulation of a 1705A FULL SPAN/DIV display showing six transponders illuminated Looking at Exciters with The 70 MHz Input to the spectrum monitor is a bnc connector. It is designed for the 70 MHz Input use with the IF signal from an up link exciter. Most up link transmitters use an exciter to drive an Upconverter and High Power Amplifier (HPA), and, in most cases, the driving signal to the Upconverter is a 70 MHz IF.
Page 36: Miscellaneous Uses For The 1705A
Figure 1-9: Up link Video Exciter, Up converter, and High Power Amplifier (HPA) showing how to hook up a 1705A Spectrum Monitor to look at the Video Exciter output In addition to the other measurements that can be made a quick check of HPA,...
Page 37: Figure 1-10: 1705A Hooked Up To Look At Either The Output Of The Video Exciter (70 Mhz)
Introduction Figure 1-10: 1705A hooked up to look at either the output of the Video Exciter (70 MHz) or the Receiver Input (L-Band) 1- 18 L-OUT Ku-IN L-BAND 900- -1450 MHZ 1705A SPECTRUM MONITOR 3 dB SPLITTER RECEIVER Ku-BAND 12 GHZ...
Page 38: Section 2 Operating Instructions
Operating Instructions...
Page 40: Front-Panel Controls And Indicators
2. RESOLUTION INPUT 3. INPUT 1705A Spectrum Monitor Turns on or off the Video Filter, which reduces the post detection bandwidth (video), to reduce the high-frequency components for display noise averaging. A front-panel LED indicator lights when the Video Filter is on.
Page 41: Figure 2-1: 1705A Front Panel
Operating Instructions Figure 2-1: 1705A front panel; refer to text for descriptions of controls identified with circled numbers SWEEP 4. SWEEP SPEED 5. CENTER FREQUENCY 2- 2 Tektronix - - 10 - - 20 - - 30 - - 40...
Page 42: Display
A variable control that adjusts the level of graticule illumination. A variable control that adjusts the display brightness. A screwdriver adjustment that aligns the crt trace with the crt graticule to compensate for variations in the magnetic field surrounding the 1705A. Operating Instructions 2- 3...
Page 43: Position
POWER switch state. To totally remove shock hazard, it is necessary to unplug the instrument and wait for the capacitors to discharge. Rear- Panel Connectors Signal input and power input are located on the 1705A rear panel. See Fig- ure 2-2 for the locations of the rear-panel connectors. INPUTS 1.
Page 44: Power
Figure 2-2: 1705A rear panel controls and connectors; refer to text for descriptions of controls identified with circled numbers 3. LNB POWER (Indicator) 4. 70 MHz POWER 5. AC FUSE 6. AC POWER 1705A Spectrum Monitor SPECTRUM MONITOR WARNING TO AVOID ELECTRICAL SHOCK, THE POWER CORD PROTECTIVE GROUNDING CONDUCTOR MUST BE CONNECTED TO EARTH GROUND.
Page 45: Powering- Up
Operating Instructions Powering- up When the 1705A is first powered up, it should come up in a measurement mode. Most commonly it will be configured as it was when it was last turned off. If not, there are some very simple checks that should be made.
Page 46: Vertical Scales 2
Measurement Graticule The 1705A is equipped with an internal graticule crt. The graticule has an 8 X 10 division scale that is lighted. Scale brilliance is controlled by the front-panel SCALE control. Figure 2-4 shows the 1705A graticule. Refer to this figure and subsequent figures when reading the following discussion of the graticule.
Page 47: Table 2- 1: Db Reference
15848.932 141.254 19952.623 158.489 25118.864 177.828 31622.777 199.526 39810.717 223.872 50118.723 251.189 63095.734 281.838 79432.023 316.228 100000.000 354.813 125892.541 398.107 158489.319 446.684 199526.231 501.187 251188.643 562.341 316227.766 630.957 398107.171 707.946 501187.234 794.328 630957.344 891.251 794328.235 1000.00 1000000.000 1705A Spectrum Monitor...
Page 48: Horizontal Scales
Traditionally, many spectrum analyzer measurements and specifications are between 6 and 60 dB. The available sweep for the 1705A is 12 divisions long, which means that not all of the frequencies that it is capable of displaying can be displayed simultaneous- ly.
Page 49: Mid Frequency
SPAN/DIV settings and the readout cursor. 2- 10 MINIMUM FREQUENCY L-BAND = 900 MHz 70 MHz = 45 MHz FREQUENCY SCALE = 10 DIVISIONS SWEEP LENGTH = 12 DIVISIONS MAXIMUM FREQUENCY L-BAND = 2000 MHz 70 MHz = 100 MHz 1705A Spectrum Monitor...
Page 50: Center Frequency Readout
Figure 2-6: Frequency relationship to horizontal graticule scale; center frequency corresponds to the center of the horizontal scale The 1705A is equipped with alphanumeric readout for the CENTER FREQUEN- CY. This readout works in conjunction with a cursor. In FULL SPAN/DIV, the cursor is actually a bright-up zone on the trace.
Page 51: Figure 2-7: Center Frequency Cursor And Readout For The L-Band With Full Span/Div
See Figure 2-9. 2- 12 1400 MHZ - - 10 - - 20 - - 30 - - 40 - - 50 - - 60 - - 70 1705A Spectrum Monitor...
Page 52: Figure 2-8: 1705A Crt With The Scale Turned Down
POINT ON THE TRACE THAT CORRESPONDS TO 1400 MHZ. CENTER FREQUENCY TUNED AT THIS POINT. Figure 2-8: 1705A CRTwith the SCALE turned down to show the relationship between the alphanumeric readout and the front-panel CENTER FREQUENCY tuning 1400 MHZ POINT ON THE...
Page 53: Customizing Frequency Readout
Operating Instructions Customizing Frequency Readout The type and location of the readout for the TEKTRONIX 1705A Spectrum Monitor can be changed from the front panel. The options available are: 1. The choice of having readout or turning it off. 2. The position on the crt where the readout appears.
Page 54: Spectrum Display
[SPAN>] EXIT/SAVE [INPUT] Figure 2-10: Using the 1705A menus. Main menu is entered from the spectrum display by pressing both SPAN/DIV buttons simultaneously NOTE. The 1705A must be returned to the normal operating routine before the front-panel push-button switches perform the label functions. Push the INPUT push button as many times as required to bring up the spectrum analyzer display.
Page 55: Figure 2-11: An Example Of The Readout Displayed While Satellite Frequency Is Being Set
Once the readout has been changed to GHz, the frequency display can be altered to show frequencies ascending or descending from left to right. When L.O. High is selected turning the front-panel CENTER FREQUENCY clockwise incre- 2- 16 12.00 GHZ 1705A Spectrum Monitor...
Page 56: Test Mode
Even though the 1705A will be most often used for Ku- -Band transmissions, it can be used with any satellite system that can be downconverted to its L- -Band input frequencies.
Page 57: Table 2- 3: Azimuth / Elevation Table For 21 Conus Cities
(LNB) to the indoor receiver. If the antenna is to be adjusted manually, a portable ac or battery-powered 1705A may be connected directly to the LNB at the antenna, in which case the spectrum monitor can be used to power the LNB.
Page 58 6. If no satellite signal is observed, or the incorrect satellite is identified, sweep 7. When a satellite signal has been observed on the 1705A display, it may be 8. Optimize the antenna by carefully adjusting azimuth and elevation while 9.
Page 59 10. Before transmitting, the satellite operator will need to be contacted. The 11. During transmit, the 1705A may be used to verify the presence of video, 12. Be sure that there is an agreed upon “good night” for the transmission. The...
Page 60 WARNING The following servicing instructions are for use only by qualified personnel. To avoid injury, do not perform any servicing other than that stated in the operating instructions unless you are qualified to do so. Refer to all safety summaries before performing any service.
Page 62: Section 3 Installation
Installation...
Page 64: Packaging
(such as phase-to-phase in multiphase systems) are not recommended as power sources. Mains Frequency and The 1705A operates over a frequency range of 48 to 66 Hz, at any mains voltage Voltage Ranges between 90 Vac and 250 Vac. These newer versions of the 1705A instruments do not require any internal changes to select their operating voltage range.
Page 65: Operating Options
Under extreme LNB load conditions it is possible for the +18 V supply to load the main 1705A power supply enough to change the low line regulation. Under these circumstances the power supply may go out of regulation when mains voltage falls below 100 V.
Page 66: Figure 3-2: Dimensions Of The 1700F00 Plain Cabinet
All qualification testing for the 1705A was performed with a 1700F00 cabinet installed. See Figure 3-2. To guarantee compliance with specifications, the instrument must be operated in a cabinet. The portable cabinet, 1700F02, has a handle, four feet, a flip-up stand, and has different hole sizes and spacing than the 1700F00.
Page 67: Cabinetizing
3- 4 209.55 mm (8.250 in) 209.55 mm (8.250 in) 174.63 mm (6.875 in) 126.49 mm Rear (4.980 in) Do not attempt to carry a cabinetized instrument without installing the 17.48 mm (0.688 in) 14.00 mm (0.551 in) 1705A Spectrum Monitor...
Page 68: Rack Adapter
Rack Adapter The optional WFM7F05 side-by-side rack adapter, shown in Figure 3-5, consists of two attached cabinets. It can be used to mount the 1705A and another half-rack width instrument in a standard 19-inch rack. CAUTION. Be sure to read and follow the instructions that are shipped with the rack adapter.
Page 69: Figure 3-5: The Wfm7F05 Side-By-Side Rack Adapter
See Figure 3-5. Figure 3-6: A WFM7F05 with a blank front panel (1700F06) 3- 6 6.875 Mounting holes Rear view 1700F06 18.970 5.250 17.270 Controls front panel to rack alignment WFM7F05 1705A Spectrum Monitor...
Page 70 If only one side of the rack adapter is used, a 1700F06 Blank Panel can be inserted in the unused section. See Figure 3-6. The rack adapter and panel are available through your local Tektronix field office or representative. When only one instrument is mounted in the side-by-side adapter, an accessory drawer (1700F07) can be installed in the blank side of the cabinet.
Page 71: Custom Installation
Figure 3-8: Considerations for custom installation of an instrument To mount the 1705A safely, attach it to a shelf strong enough to hold its weight, using the four 0.156-inch diameter holes in the bottom of the 1700F00 cabinet. See Figure 3-8.
Page 72: Section 4 Theory Of Operation
Theory of Operation...
Page 74: Overview
Voltage Power Supply provides 13 kV acceleration potential. Block Diagram RF Input Circuits The 1705A has two separate signal inputs, L- -Band (Sweep range 900 - - (Diagram 1) 2000 MHz, calibrated range 900 - - 1750 MHz) and 70 MHz (45 - - 100 MHz).
Page 75: Deflection Amplifiers (Diagram 4) 4
Block Down Converter (usually at the antenna). The supply can be switched on and off by a recessed slide switch on the rear panel. The voltage is generated on a separate circuit board that is mounted inside the 1705A rear panel.
Page 76: Deflection Amplifiers (Diagram 4)
1705A. A Non-Volatile Random Access Memory (NVRAM) provides a method to store the current front-panel switch settings, at power down, so that the 1705A can come back up with the last front-panel setup.
Page 77: High Voltage (Diagram 8)
The input to the 70 MHz tuner has a 75Ω, 10 dB pad, which allows it to accept signals up to - -20 dBm. The 70 MHz signal (45 - - 100 MHz) is preconditioned 4- 4 anode voltage is provided by an encapsulated 4X Multiplier. IF signal is cabled to the Main board. 1705A Spectrum Monitor...
Page 78: 70 Mhz Local Oscillator
FL1, tuned to 359.4 MHz. The output from FL1 is coupled into DBM U28. 1705A Spectrum Monitor + 130 MHz] provide a 130 MHz 1 IF frequency (136 MHz) and approximately 20 dB down at the Local Theory of Operation IF.
Page 79: Input Filter, Mixer, And If Amplifier
IF frequency. J6 is a test jumper that can be lifted to IF Amplifier, U22, has a gain of 20 dB. U22 requires a 6 V Vcc; VR3 IF frequency. IF signal passes through the 300 kHz Resolution filter or a IF frequency to IF frequency to trouble- 1705A Spectrum Monitor...
Page 80: Z- - Axis Control 4
70 MHz shaper has four adjustments, R48, R49, R55, R56; and the L- -BAND shaper has six adjustments, R35, R51, R58, R75, R81, and R82. Figure 4-1 shows the area of control for the various adjustments on the 1705A L- -Band display, when a comb signal is applied.
Page 81: Bright- - Up Generator
Theory of Operation Figure 4-1: 1705A L- Band comb display showing the areas each of the six sweep shaper variable resistors adjust Bright- Up Generator The Marker Generator is U14. The front-panel CENTER FREQUENCY control provides the voltage from which the digital frequency readout is obtained. In...
Page 82: Z- - Axis Control
U21C grounds R135 through pins 3 and 4. This increases the gain of U27 by approximately a factor of five. U21A also switches, connecting pins 13 and 14, putting a portion of the Vertical Position 1705A Spectrum Monitor Theory of Operation 4- 9...
Page 83: Horizontal Deflection Amplifier 4
R178 and R179. Q18 and Q19 are a temperature- compensated current source from the - -11.8 volt supply. 4- 10 ) for U26B, an inverting of the operational amplifier while holding R 1705A Spectrum Monitor ) consists of R180...
Page 84: Microprocessor Diagram 5 4
Microprocessor Diagram 5 The 1705A is a microprocessor-controlled instrument. Circuitry on Diagram 5 shows the microprocessor, the front-panel LED drive, the crt readout drive, the graticule light circuit, and the trace rotation circuit. Microprocessor The processor (U2) is an 8-bit, 3-port microprocessor running at 12 MHz. U8 is the lower order address de-multiplexer for the Program PROM U9.
Page 85: Indicators, Controls, And Switches 4
Trace rotation compensates for changes in the magnetic field surrounding the 1705A. Q1 and Q2 are emitter followers that provide the Trace Rotation current to a coil around the crt, inside the shield. The voltage on the emitter of either Q1 or Q2 will develop a current through R19 to drive the coil.
Page 86: Volt Supply
See Figure 4-2. The output voltage is fed back to the FB input of U583, which compares it to an internal reference voltage to determine the on time for the 1705A Spectrum Monitor ) for U583 is approximately 8 V and is present on pin 2.
Page 87: Low Voltage Power Supply Diagram
Energy is being stored in the magnetic field of T3. When Q9 turns off, the drain voltage “flies back” in a positive direction. Current now flows in all of the secondary windings and supplies power. 4- 14 15 V, and +5 V. 1705A Spectrum Monitor...
Page 88: Line Rectifier And Filter 4
C52, connected to U5 pin 4, set the internal oscillator to 80 kHz. The circuit works as follows: The oscillator resets the latch and U5 pin 6 goes high, turning the switcher mosfet on. The current through the switcher mosfet 4- 15 1705A Spectrum Monitor...
Page 89: Feedback Transformer Driver And Peak Detector 4
If the +5 V does not reach 4.9 V within 50 ms of power up, U3B will shut down the switcher. The power supply will then cycle on and off every couple of seconds. 4- 16 1705A Spectrum Monitor...
Page 90: Hv Osc And Error Amp
C66 and Q10 are a start delay circuit that holds the Error Amplifier output low, through CR30, until C66 is charged. Delaying the start of the high voltage oscillator allows the Low Voltage Power Supply to start, unencumbered by the load from the high voltage oscillator. 1705A Spectrum Monitor Theory of Operation 4- 17...
Page 91: Power Supply Outputs 4
R7, R20, and R33 act to maintain the summing junction at +5 V. Without any Z–Axis input current, the amplifier output is approximately +10 V. Negative Z–Axis input current will cause the output to go positive. 4- 18 1705A Spectrum Monitor...
Page 92 C6 speeds up the amplifier by coupling ac signals to the base of Q3. CR2 and R41 protect the amplifier during crt arcing. The pinout for the CRT is shown in Figure 4-3. Figure 4-3: Pinout of the CRT Socket 1705A Spectrum Monitor Theory of Operation Description Filament (f)
Page 93 Theory of Operation 4- 20 1705A Spectrum Monitor...
Page 94: Section 5 Checks And Adjustments 5
Checks and Adjustments...
Page 96: Checks And Adjustments
10 ns/Division to 5 ms/Division sweep speeds, triggering to 5 MHz. For example: a TEKTRONIX 7603 Oscilloscope with a 7A18 Dual-Trace Amplifier and a 7B53A Dual Time Base, or a TEKTRONIX 11403A Oscilloscope with a 11A34V Video Amplifier and an 11T5H Video Trigger.
Page 97: Auxiliary Equipment
TEKTRONIX TM500 Series Power Module. Range, 0 to greater than 100 Vdc; accuracy, ±0.1%. For example: A TEKTRONIX DM501A in a TM500 Series Power Module. DC503A, FG503, 067-0916-00, and 015-0408-00. For example: A TEKTRONIX TM506 Power Module.
Page 98: Performance Check
4. Check 70 MHz Linearity 5. Check 70 MHz SPAN/DIV and Readout 1705A Spectrum Monitor Two required (supplied with the Tektronix Comb Generator). For example: Tektronix Part No. 015-1018-00. For example: Coaxial Components Corporation Part No. 2525-4. a. Connect autotransformer.
Page 99: Alternate Method
CHECK - - for 1 marker every 5 Divisions, ±1 Division. CHECK - - for 1 marker every 5 Divisions, ±1 Division. o. CHECK - - that the marker is intensified. q. CHECK - - that the marker is on screen. 1705A Spectrum Monitor...
Page 100: Long Form Procedure
CHECK - - that the noise floor can be positioned on screen. 1. Preliminary Setup a. Connect the 1705A ac power cord to the variable autotransformer. Turn power on and set the autotransformer to the local nominal mains voltage (110 V or 220 V).
Page 101: Table 5- 1: Preliminary Control Settings
Table 5- 1: Preliminary Control Settings POWER INTENSITY FOCUS SCALE VERTICAL POSITION HORIZONTAL POSITION INPUT RESOLUTION VIDEO SPAN/DIV CENTER FREQUENCY SWEEP SPEED 1705A VARIABLE AUTOTRANSFORMER 70 MHz INPUT Set to Preference Set later 70 MHz 300 kHz FULL anywhere SG503 Comb Generator 1705A Spectrum Monitor...
Page 102 1705A Spectrum Monitor c. Connect the leveled sine wave generator output to the comb generator. Connect the comb generator output to the 1705A rear-panel 70 MHz INPUT. See Figure 5-1. REQUIREMENT — Check ac input range, 90 - - 250 V.
Page 103 Connect the leveled sine wave generator to the 70 MHz input without the comb generator. See Figure 5-3. CHECK THAT 3rd MARKER IS +/-- 1 MINOR DIVISION FROM HERE 4th major graticule division marker is on the left edge of the graticule 1705A Spectrum Monitor...
Page 104 Figure 5-3: Output of the SG503 connected directly to the 1705A 70 MHz INPUT 1705A Spectrum Monitor 1705A VARIABLE AUTOTRANSFORMER 70 MHz INPUT g. Set the leveled sine wave generator Frequency to 45 MHz, Amplitude Multiplier to .01, and Amplitude to 0.5 (- -42 dBm).
Page 105 Set the leveled sine wave generator Frequency to 50 MHz. CHECK - - that the tip of the marker is on the crt center line, ±1 minor Division (vertically). Set the leveled sine wave generator Frequency to 90 MHz. 1705A Spectrum Monitor...
Page 106 8. Check Video Filter 9. Check Sweep Speed 1705A Spectrum Monitor k. CHECK - - that the marker tip is on the crt center line ±1 minor Division (vertically). REQUIREMENT - - Video Filter reduces noise by approximately 50%. a. Be sure that the VIDEO FILTER is OFF.
Page 107 Figure 5-4: Equipment connections for L- Band checkout 5- 12 REQUIREMENT - - One marker per Division ±1 minor Division. a. Connect the output of the leveled sine wave generator, through the comb generator, to the 1705A L- -BAND INPUT. See Figure 5-4. 1705A VARIABLE AUTOTRANSFORMER b.
Page 108 Figure 5-5: Aligning L- Band time markers with the graticule lines. The graticule begins with 0 while the time markers are counted 1, 2, 3, etc. The first and last divisions of sweep should be disregarded 11. Check L- -Band SPAN/DIV and Readout 1705A Spectrum Monitor ALIGN 2nd MARKER HERE DISREGARD...
Page 109 Repeat parts f. through i. with CENTER FREQUENCY at 950 MHz and 1700 MHz. k. Remove the leveled sine wave generator and comb generator from the 1705A L- -BAND INPUT. Connect the UHF signal generator output to the 1705A L- -BAND INPUT. See Figure 5- -6. VARIABLE AUTOTRANSFORMER...
Page 110 MHz.) a. Set SPAN/DIV to FULL. b. Set the 1705A SWEEP SPEED fully counterclockwise. c. Set the UHF signal generator Frequency to 1400 MHz and Amplitude to - -30 dBm. Position the tip of the marker to the - -10 graticule reference line (vertical scale).
Page 111 VERTICAL controls, check that the marker tip can be positioned on screen. e. Return to FULL SPAN. Turn the 1705A SWEEP SPEED control fully counterclockwise. g. CHECK - - for more than 1 Division of amplitude change while switching the frequency generator between - -50 dBm and - -53 dBm.
Page 112: Adjustment Procedure
11. Adjust 10 kHz Filter (C52, C62, C64, and R175) 12. Adjust L-Band Linearity (R35, R51, R58, R75, R81, and R82) 13. Adjust Readout Range (R4) 14. Adjust Span/Div Magnification Registration (R27) 1705A Spectrum Monitor Checks and Adjustments 5- 17...
Page 113: Long Form Procedure
(Refer to Figure 5-7 for adjustment locations.) 1. Adjust +5 V 5- 18 Connect the 1705A ac power cord to the variable autotransformer. Turn the 1705A power on. Set the front-panel controls to start this procedure as shown in Table 5- -2.
Page 114 GEOM ASTIG BIAS Figure 5-7: Adjustment locations 1705A Spectrum Monitor a. Turn the INTENSITY control fully counterclockwise. b. ADJUST - - R58 (CRT BIAS) so that the display is just extinguished. c. Set INTENSITY control for a useable display. R111...
Page 115 4. Adjust Trace Rotation 5- 20 Display the DAC test pattern by completing parts a. through c. a. Press both the 1705A SPAN/DIV buttons simultaneously to display the Main Menu. b. Press either SPAN/DIV button to move the cursor to TEST, then press the INPUT button to display the TEST menu.
Page 116 5. Adjust On-Board Regulated Power Supplies 6. Adjust Horizontal Gain Figure 5-9: Location of the shorting strap used when adjusting sweep length 1705A Spectrum Monitor b. Exit the DAC test pattern by first pressing the INPUT button to display the TEST menu.
Page 117 NOTE. Use an insulated tool for the following adjustments. 5- 22 Display the DAC test pattern by completing parts a. through c. a. Press both the 1705A SPAN/DIV buttons simultaneously to display the Main Menu. b. Press either SPAN/DIV button to move the cursor to TEST, then press the INPUT button to display the TEST menu.
Page 118 Repeat this step as necessary until the signal amplitude is 37 to 43 dB above the noise floor. a. On the 1705A select 70 MHz INPUT, turn the CENTER FREQUENCY knob fully counterclockwise, and set the SPAN/DIV to 1 MHz.
Page 119 Set the signal generator Frequency to 70 MHz, and the Amplitude to - -25 dBm. c. On the 1705A set SPAN/DIV to 100 kHz, adjust CENTER FREQUEN- CY to position the marker onto the screen, and set RESOLUTION to 10 kHz.
Page 120 13. Adjust Readout Range 14. Adjust Span/Div Magnification Registration 15. Adjust Span/Div Magnifier Range 1705A Spectrum Monitor g. ADJUST - - R51, R58, R75, R81, and R82 for a linear display with each marker on a graticule mark, ±1 minor Division.
Page 121 ADJUST - - R36 to center the intensified zone on the 900 MHz marker. h. Repeat this step until the intensified zone is centered on appropriate markers. a. Set the 1705A SWEEP SPEED fully counterclockwise. b. Set the signal generator Frequency to 1400 MHz, and Amplitude to - -30 dBm.
Page 122 18. Adjust 2 dB/Div Position 19. Adjust 590 MHz Notch End of Adjustment Procedure 1705A Spectrum Monitor e. ADJUST - - R239 (IF AGC) for maximum signal amplitude. ADJUST - - R240 (RF AGC) so the signal is one major Division (±0.5 major Divisions) down from the top graticule line.
Page 123 Checks and Adjustments 5- 28 1705A Spectrum Monitor...
Page 124: Maintenance 6
Maintenance...
Page 125 Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.com...
Page 126: Visual Inspection 6
Once the dirt is loosened remove it with low- -pressure air (high-velocity air can damage some parts). Hardened dirt or grease may be removed with a cotton-tipped applicator dampened with a solution of mild 1705A Spectrum Monitor 6- 1...
Page 127: Static- Sensitive Components
LOW POWER SCHOTT- KY TTL Voltage 100 V - - 500 V 200 V - - 500 V 250 V 500 V 400 to 600 V 600 to 800 V 400 to 1000 V est. 900 V 1200 V 1705A Spectrum Monitor...
Page 128: Performance Checks And Readjustments 6
Procedure are in Section 5. TROUBLESHOOTING The 1705A is equipped with a microprocessor and, as with all of the new Tektronix monitors, it is capable of some power-up and off-line diagnostics. A thorough understanding of the information available in the diagnostic routines will assist in isolating problems and speed repairs.
Page 129: Diagnostic Routines
[<SPAN] [SPAN>] EXIT/SAVE [INPUT] Figure 6-1: Using the 1705A menus; Main menu is entered from the spectrum display by pressing both SPAN/DIV buttons simultaneously Diagnostic Routines Diagnostics are addressed by pushing both ←SPAN→ buttons at the same time, which brings up the Main menu on the crt screen. Figure 6-1 shows the Main menu, and all of the submenus.
Page 130: Memory Test
INPUT push button. Figure 6-2: 1705A Test menu, displayed when Test is the Main menu selection Memory Test The NOVRAM (Non Volatile Random Access Memory) test is selected from the crt-displayed Test menu by pushing the VIDEO push button.
Page 131 (either turned off or lost due to power failure) so that it can be recalled when the instrument is powered up again. If the 1705A does not come back with its previous front-panel setup, it will provide an error message. See Figure 6-4.
Page 132: Dac Test
Figure 6-5 shows the waveform superimposed over the crt graticule to demon- strate its value as an adjustment tool. The DAC test is selected, from the Test Auxiliary menu, by pushing the 1705A RESOLUTION push button. The test in progress is exited any time the INPUT push button is pushed.
Page 133: Foldout Pages 6
Signals leaving or entering a schematic diagram are cross-referenced with the connecting schematic number in brackets and the schematic grid location in small print. 6- 8 - - 10 - - 20 - - 30 - - 40 - - 50 - - 60 - - 70 1705A Spectrum Monitor...
Page 134: Parts Lists 6
Replaceable Electrical Parts. This list is arranged by assembly as designated in ANSI Standard Y32.16- -1975. The list begins with the part numbers for the major assemblies (etched circuit boards). Each circuit board is identified by an A# (assembly number). 6- 9 1705A Spectrum Monitor...
Page 135: Major Assembly Interconnection 6
A pin replacement kit including necessary tools, instructions, and replacement pins is available from Tektronix, Inc. Contact a Tektronix field office or representative for assistance in ordering this kit. Connectors with Center Polarizers. These polarizers serve as a key for proper mating with the connector on the circuit board.
Page 136 Figure 6-7: Multiple pin connectors used in the 1705A Spectrum Monitor CAUTION. Always remove the assembly from the instrument prior to attempting to replace a soldered-in component.
Page 137: Power Supply Troubleshooting Procedure
Before changing an adjustment, note its position so that it can be returned to its original setting. be advisable to contact your local Tektronix field office or representative before continuing. If the repair is minor, such as replacing a component, see the parts list for replacement information.
Page 138: Low Volts Supply
(secondary ground). 1. Preliminary Checks NOTE. The Low Volts Power Supply troubleshooting is performed without applying ac power. 1705A Spectrum Monitor Table 6- 2: Power Supply Fault Symptoms (Cont.) Power Supply cycles OFF/ON Does not power up 5 V not regulating Improper crt display a.
Page 139: Output Check
Q2 (High Volts Power Supply). a. Connect the negative output from the 20 Vdc Power Supply to TP2. Connect the positive output to the cathode of CR17. Short C47 with a clip lead. Connect the oscilloscope probe ground to TP2. 1705A Spectrum Monitor...
Page 140: High Volts Supply
5. Error Amplifier Check High Volts Supply Table 6- -5 lists the High Volts Supply fault symptoms and procedures. 1705A Spectrum Monitor b. Table 6- -4 lists the signal present in a properly functioning control circuit. Table 6- 4: Control Circuit Test Points...
Page 141: Table 6- 5: High Volts Supply Fault Symptoms
Unable to focus crt using the front- panel control Unable to adjust crt intensity using the front-panel control No crt display Procedure Focus Amplifier Check Z--Axis Amplifier Check Grid Drive Check High Voltage Oscillator Check CRT Voltage Check 1705A Spectrum Monitor...
Page 142: Table 6- 6: High Voltage Oscillator Test Points
- -2530 V. Measure the voltage at the anode end of CR3. It should be 50- -150 V more negative than the reading from the anode of CR4. 1705A Spectrum Monitor Table 6- 6: High Voltage Oscillator Test Points Circuit Location...
Page 143: Test Selected Components 6
If an ordered part has been replaced with a new or improved part that is a direct replacement, the new part will be shipped. If the part does not directly replace the old one, the local Tektronix field office or representative will contact the customer. After any repair or modification of the instrument, circuit readjust- ment may be required.
Page 144: Table 6- 7: Test Selectable Components
NOTE. All screws, unless otherwise noted, are TORX screws and can be removed with a T15 screwdriver tip (Tektronix part number 003-0966-00). The exception is #2 Pozidrive screws which can be removed with a #1 Pozidrive tip (003-0443-00).
Page 145: Graticule Light Removal And Replacement 6
PL317 (longer than PL312). CAUTION. Needle-nosed pliers are not recommended. Replacement bulbs are supplied with this instrument as Standard Accessories. Additional bulbs can be purchased from Tektronix (see Replaceable Electrical Parts list) or from local electronics distribution sources. Procedure 1. Remove the bezel according to the preceding instructions.
Page 146: Removal Of The Crt
5. Replace the trace rotation connector (J2, Main board), and snap the anode 6. Wipe the faceplate of the CRT to remove fingerprints, then replace the bezel. 1705A Spectrum Monitor through the hole in the board. shield, along with the rubber manchet around its back, should come out with the CRT.
Page 147: Removal Of The Rear Panel
333- -3990- -01 SPECTRUM MONITOR DIE IN DIESEM GERAT ENTSTEHENDE RONTGENSTRAHLUNG IST AUSREICHEND ABGESCHIRMT 20kV BESCHLEUNIGUNGSSPANNUNG KLEINER ALS LNB POWER L-BAND INPUT LNB POWER +18VDC@250mA 1705A Spectrum Monitor...
Page 148: Removing The L- - Band Tuner
Tuner 1. Unsolder the five wires from the tuner. 2. Unplug the phone jack from the tuner. 3. Remove the rear-panel L- -BAND INPUT connector hex nut. See Fig- 1705A Spectrum Monitor TO REMOVE FRONT PANEL ASSEMBLY a. Remove the knobs from the front.
Page 149: Removing The 70 Mhz Tuner
3. Remove the 70 MHz tuner cover. It is held on by six screws. See Fig- 4. Turn the 1705A on its left side (crt down) and remove the two screws that 5. Slide the tuner back and upward to remove.
Page 150: Removal And Replacement Of The Power Supply Board
Removal and Replacement of the Power Supply Board 1705A Spectrum Monitor Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.com 2. Remove the plugs from the following connectors: J1 to the Front-Panel board, J4 on the Power Supply board, and J2 on the Main board (Trace Rotation).
Page 151: Removing The Lnb Power Supply Board
Remove these screws to remove LNB Power Supply board (A4) or to replace LNB LED. 333- -3990- -01 DIE IN DIESEM GERAT ENTSTEHENDE RONTGENSTRAHLUNG IST AUSREICHEND ABGESCHIRMT 20kV BESCHLEUNIGUNGSSPANNUNG KLEINER ALS LNB POWER L-BAND INPUT LNB POWER +18VDC@250mA 1705A Spectrum Monitor...
Page 152: Repackaging
REPACKAGING If the instrument is to be shipped to a Tektronix Service Center for service or repair, attach a tag to the instrument showing the following information: 1. Owner (with complete address) and the name of the person at your firm that 2.
Page 153 3. Cushion the instrument on all sides by tightly packing dunnage or urethane 4. Seal the carton with shipping tape or industrial stapler. 6- 28 foam between the carton and the instrument. Allow 3 inches on all sides for cushioning. 1705A Spectrum Monitor...
Page 154: Options 7
Options...
Page 156: Options
Section 10. Field Upgrade Kits Cabinets All of the Safety and EMI tests used to qualify the 1705A were performed in a cabinet. There are two optional cabinets and a dual rack adapter available for the installation of these instruments.
Page 157: Ordering
12 Vdc power source for portable operation. Side- by- Side Rack Adapter (WFM7F05) This side-by-side rack adapter consists of two attached cabinets. It can be used to mount the 1705A and another half-rack width instrument in a standard 19-inch rack.
Page 158: Section 8 Replaceable Electrical Parts 8
Replaceable Electrical Parts...
Page 160: Using The Replaceable Electrical Parts List 8
Section 8 Replaceable Electrical Parts This section contains a list of the components that are replaceable for the 1705A. Use this list to identify and order replacement parts. There is a separate Replaceable Electrical Parts list for each instrument. Parts Ordering Information Replacement parts are available from or through your local Tektronix, Inc., Field...
Page 161: Serial/Assembly No. (Column 3 And 4) 8
Example a. Component Number A23R1234 Assembly Number Read: Resistor 1234 of Assembly 23 Example b. Component Number A23A2R1234 A23 Assembly Number Subassembly Number Read: Resistor 1234 of Subassembly 2 of Assembly 23 R1234 Circuit Number R1234 Circuit Number 1705A Spectrum Monitor...
Page 162 TEXTRON INC CAMCAR DIV S3629 SCHURTER AG H C/O PANEL COMPONENTS CORP S4307 SCHAFFNER ELECTRONIK AG 1705A Spectrum Monitor CROSS INDEX - MFR. CODE NUMBER TO MANUFACTURER Address 2800 FULLING MILL PO BOX 3608 700 ORANGE ST 1201 S 2ND ST...
Page 163 PO BOX 2345 AUGUSTA- - ANLAGE 56 5750 EAST MCKELLIPS RD 2269 SAW MILL RIVER ROAD PO BOX 127 City, State, Zip Code KANAGAWA 228 JAPAN TOKYO JAPAN 6800 MANNHEIM 1 WEST GERMANY MESA AZ 85205 ELMSFORD NY 10523 1705A Spectrum Monitor...
Page 164 A1C36 290- - 1267- - 00 1705A Spectrum Monitor Discontinued Name & Description CIRCUIT BD ASSY:POWER SUPPLY, 1705A CIRCUIT BD ASSY:FRONT PANEL CIRCUIT BD ASSY:MAIN BOARD ASSY,1705A CIRCUIT BD ASSY:MAIN BOARD ASSY,1705A CIRCUIT BD ASSY:MAIN BOARD ASSY,1705A CIRCUIT BD ASSY:GRATICULE LIGHT...
Page 165 152- - 0400- - 00 80009 152- - 0141- - 02 80009 152- - 0400- - 00 80009 152- - 0141- - 02 80009 152- - 0897- - 00 80009 152- - 1165- - 00 80009 152- - 1165- - 00 1705A Spectrum Monitor...
Page 166 151- - 0190- - 00 A1Q9 151- - 1286- - 00 210- - 0406- - 00 211- - 0008- - 00 214- - 3841- - 00 1705A Spectrum Monitor Discontinued Name & Description DIO,RECT:ULTRA FAST;600V,4A,50NS;MUR460,T&R DIO,RECT:ULTRA FAST;600V,4A,50NS;MUR460,T&R DIO,SIG:ULTRA FAST;40V,150MA,4NS,2PF;1N4152,DO- - 35,T&R DIO,SIG:ULTRA FAST;40V,150MA,4NS,2PF;1N4152,DO- - 35,T&R...
Page 167 322- - 3121- - 00 80009 322- - 3402- - 00 80009 315- - 0471- - 03 80009 315- - 0471- - 03 TK1450 GF06UT 100K 80009 322- - 3001- - 00 57668 CRB20 FXE 100K 57668 CRB20 FXE 3K01 1705A Spectrum Monitor...
Page 168 322- - 3260- - 00 A1R83 322- - 3289- - 07 A1R84 322- - 3315- - 00 A1R85 322- - 3385- - 00 1705A Spectrum Monitor Discontinued Name & Description RES,VAR,TRMR:CERMET;100K OHM,20%,0.5W,0.197 SQ,SIDE ADJUST;T&R RES,FXD:MET FILM;10 OHM,1%,0.2W,TC=100 PPM;AX- IAL,T&R,SM BODY RES,FXD,FILM:4.99K OHM,1%,0.2W,TC=T0...
Page 169 131- - 0566- - 00 80009 131- - 0566- - 00 80009 131- - 0566- - 00 80009 671- - 0041- - 01 80009 150- - 1289- - 00 80009 150- - 1290- - 00 80009 150- - 1286- - 00 1705A Spectrum Monitor...
Page 170 260- - 2300- - 00 366- - 0616- - 00 A2S123 260- - 2300- - 00 366- - 0616- - 00 1705A Spectrum Monitor Discontinued Name & Description LED ASSY:DIR;1 IN 1 LED ASSY:DIR;2 IN 3 GRN (PART OF A2DS313) CA ASSY,SP,ELEC:34,26 AWG,5.0 L...
Page 171 PUSH BTN:0.585 X 0.3 X 0.150 *END ATTACHED PARTS* SW,PUSH:SPST,25MA,15VAC *ATTACHED PARTS* PUSH BTN:0.585 X 0.3 X 0.150 *END ATTACHED PARTS* CIRCUIT BD ASSY:MAIN BOARD ASSY,1705A CIRCUIT BD ASSY:MAIN BOARD ASSY,1705A *ATTACHED PARTS* BUS,CNDCT: SHIELD,ELEC:1.29 SQ X 0.675,AL PLATE,ELEC SHLD:CIRCUIT BOARD...
Page 172 281- - 0775- - 01 A3C81 281- - 0773- - 00 A3C82 281- - 0813- - 00 A3C83 281- - 0813- - 00 1705A Spectrum Monitor Discontinued Name & Description CAP,FXD,CER:MLC;0.01UF,10%,100V,SAF,0.100 X 0.170;AX- IAL,MI CAP,FXD,CER:MLC;0.01UF,10%,100V,SAF,0.100 X 0.170;AX- IAL,MI CAP,FXD,CER:MLC;0.01UF,10%,100V,SAF,0.100 X 0.170;AX-...
Page 173 152- - 0141- - 02 05828 GP10G- - 020 05828 GP10G- - 020 80009 152- - 0141- - 02 80009 152- - 0141- - 02 80009 152- - 0141- - 02 80009 152- - 0141- - 02 1705A Spectrum Monitor...
Page 174 A3L2 120- - 0382- - 00 A3L3 120- - 0382- - 00 A3L4 114- - 0475- - 00 A3L5 108- - 0826- - 00 1705A Spectrum Monitor Discontinued Name & Description DIO,SIG:ULTRA FAST;40V,150MA,4NS,2PF;1N4152,DO- - 35,T&R DIO,SIG:ULTRA FAST;40V,150MA,4NS,2PF;1N4152,DO- - 35,T&R DIO,SIG:ULTRA FAST;40V,150MA,4NS,2PF;1N4152,DO- - 35,T&R...
Page 175 151- - 0190- - 00 80009 151- - 0188- - 00 80009 151- - 0188- - 00 80009 151- - 0282- - 00 80009 151- - 0719- - 01 80009 151- - 0367- - 00 56289 CT7916 56289 CT7916 1705A Spectrum Monitor...
Page 176 322- - 3097- - 00 A3R10 322- - 3097- - 00 A3R11 322- - 3097- - 00 A3R12 322- - 3097- - 00 1705A Spectrum Monitor Discontinued Name & Description XSTR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ, AMPL;2N3904,TO- - 92 EBC XSTR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ, AMPL;2N3904,TO- - 92 EBC XSTR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ,...
Page 177 CRB20 FXE 1K00 91637 CCF50- - 2- - G1500F 80009 322- - 3258- - 00 80009 322- - 3289- - 00 57668 CRB20 FXE 2K00 57668 CRB20 FXE 3K01 80009 322- - 3289- - 00 57668 CRB20 FXE 2K00 1705A Spectrum Monitor...
Page 178 322- - 3318- - 00 A3R80 322- - 3289- - 00 A3R81 311- - 2235- - 00 A3R83 322- - 3385- - 00 1705A Spectrum Monitor Discontinued Name & Description RES,FXD:MET FILM;20K OHM,1%,0.2W,TC=100 PPM;AX- IAL,T&R,SM BODY RES,VAR,TRMR:CERMET;10K OHM,20%,0.5W,0.197 SQ,TOP ADJUST;T&R RES,VAR,TRMR:CERMET;10K OHM,20%,0.5W,0.197 SQ,TOP...
Page 179 CRB20 FXE 604E 57668 CRB20 FXE 511E 80009 322- - 3281- - 00 80009 322- - 3281- - 00 57668 CRB20 FXE 15K0 57668 CRB20 FXE 511E 80009 322- - 3289- - 00 80009 322- - 3289- - 00 1705A Spectrum Monitor...
Page 180 322- - 3318- - 00 A3R159 322- - 3414- - 00 A3R160 322- - 3453- - 00 A3R161 322- - 3262- - 00 1705A Spectrum Monitor Discontinued Name & Description RES,FXD,FILM:6.19K OHM,0.2W,5% RES,FXD,FILM:12.7K OHM,1%,0.2W,TC=T0 RES,FXD,FILM:1M OHM.1%,0.2W,TC=T0 RES,FXD,FILM:806 OHM,1%,0.2W,TC=T0 RES,FXD,FILM:54.9K OHM,1%,0.2W,TC=T0 RES,FXD,FILM:4.99K OHM,1%,0.2W,TC=T0...
Page 181 CRB20 FXE 100K 80009 322- - 3177- - 02 91637 CCF50- - 2F340R0F 80009 322- - 3376- - 00 57668 CRB20 FXE 100E 80009 322- - 3177- - 02 57668 CRB20 FXE 100E 80009 322- - 3138- - 00 1705A Spectrum Monitor...
Page 182 322- - 3239- - 00 A3R236 322- - 3258- - 00 A3R237 322- - 3222- - 00 A3R238 322- - 3254- - 00 1705A Spectrum Monitor Discontinued Name & Description RES,FXD,FILM:243 OHM,1%,0.2W,TC=T0 RES,FXD,FILM:243 OHM,1%,0.2W,TC=T0 RES,FXD:MET FILM;10K OHM,1%,0.2W,TC=100 PPM;AX- IAL,T&R,SM BODY RES,FXD:MET FILM;8.25K OHM,1%,0.2W,TC=100 PPM;AX-...
Page 183 160- - 8789- - 00 09922 DILB28P- - 108 80009 156- - 2493- - 00 80009 156- - 1126- - 00 80009 156- - 1191- - 00 80009 156- - 0048- - 00 80009 156- - 1200- - 00 1705A Spectrum Monitor...
Page 184 671- - 1796- - 01 A3A1DS100 150- - 0168- - 00 136- - 1119- - 01 A3A1DS200 150- - 0168- - 00 136- - 1119- - 01 1705A Spectrum Monitor Discontinued Name & Description IC,LIN:BIPOLAR,VR;NEG,ADJUST,1.5A,4%;LM337T,TO- - 220 IC,LIN:BIFET,OP- - AMP;QUAD;TL074CN/LF347N/ MC34004P,DIP14.3 IC,MISC:CMOS,ANALOG SW;QUAD SPST,100 OHM,400NS;DG444,DIP16.3...
Page 185 151- - 0710- - 00 80009 151- - 0622- - 00 80009 151- - 0188- - 00 80009 151- - 0462- - 00 80009 151- - 0188- - 00 80009 322- - 3162- - 00 57668 CRB20 FXE 71E5 1705A Spectrum Monitor...
Page 186 281- - 0537- - 00 A5C290 283- - 0637- - 00 A5C292 283- - 0637- - 00 A5C295 281- - 0772- - 00 1705A Spectrum Monitor Discontinued Name & Description RES,FXD:MET FILM;1.5K OHM,1%,0.2W,TC=100 PPM;AX- IAL,T&R,SM BODY RES,FXD:MET FILM;475 OHM,1%,0.2W,TC=100 PPM;AX- IAL,T&R,SM BODY RES,FXD:MET FILM;10K OHM,1%,0.2W,TC=100 PPM;AX-...
Page 187 CA3102E- - 98 80009 156- - 3047- - 00 80009 152- - 0227- - 00 80009 119- - 4338- - 00 80009 671- - 3637- - 00 22526 65561- - 107 22526 65561- - 104 22526 65561- - 107 1705A Spectrum Monitor...
Page 188 154- - 0995- - 16 W698 174- - 0800- - 00 W890 174- - 2646- - 00 W900 174- - 2645- - 00 1705A Spectrum Monitor Discontinued Name & Description SOCKET:CRT,TUBE,1730,SAFETY CONN,RF PLUG: *ATTACHED PARTS* TERM,LUG:0.2 ID,PLAIN,BRS TIN PL *END ATTACHED PARTS* SW,PUSH:0.4A,125VAC,W/SLDR LUG,BTN W/YEL IND...
Page 189 Replaceable Electrical Parts 8- 30 1705A Spectrum Monitor...
Page 190: Diagrams/Circuit Board Illustrations
Diagrams/Circuit Board Illustrations...
Page 192 ID CONTROL, (ID CONTROL), or /ID CONTROL. Abbreviations are based on ANSI Y1.1- -1972. Other ANSI standards that are used in the preparation of diagrams by Tektronix, Inc. are: Y14.15, 1966 -- Drafting Practices. Y14.2, 1973 -- Line Conventions and Lettering.
Page 194 /V FILTER X- -AXIS /RO-EN NV-RAM Y- -AXIS RO-BLANK FOCUS MARKER Z- -AXIS GENERATOR CONTROL CENTER INTENS FREQUENCY 1705A Spectrum Monitor MULT HIGH Z- -AXIS VOLTAGE AMPLIFIER POWER SUPPLY +40 VDC VOLTAGE +15 VDC POWER +5 VDC SUPPLY - -15 VDC...
Page 195 R116 R172 R117 R173 R118 R174 R119 R175 R120 R176 R121 R177 R122 R178 R123 R179 R124 R180 R125 R181 1705A Comp Diag Diag Comp Diag Diag Diag Comp Diag Diag R182 R238 U17D R183 R239 U18A R240 U18B R184...
Page 196 A3 Main Board See parts list for earier values and serial number ranges. Static Sensitive Devices See Maintenance Section A5 70 MHz Tuner Board...
Page 197 R217 R298 C290 R299 C292 R233 R391 R234 R392 C295 R235 R393 C298 R236 R398 C299 R237 C389 T187 C395 R238 R239 U190 CR280 R240 U283A R305 U283B R306 E100 U296 R307 E101 E102 VR398 E103 J400 J890 1705A Diag...
Page 198 R216 8.25K CR31 <5> /LBAND R215 20.0K +11.8V R214 4.75K R205 8.25K R217 2.74K --- 11.8V 1705A SPECTRUM MONITOR +11.8V C109 5000PF R398 150.0 VR398 6.2V C298 .1UF C299 4700PF --- 32 dBm 3 dB PAD --- 35 dBm 3 dB PAD...
Page 199 R145 R146 R147 R148 R149 R150 R153 R154 R155 R156 R157 R163 R164 R165 R166 R167 R169 R170 R171 R172 1705A Comp Diag R173 R174 R175 R181 R182 R183 R187 R195 R196 R201 R202 R203 R206 R207 R208 R218 R219...
Page 200 --- 11.8V .1UF .1UF CR22 33PF CR25 210UH 1.95UH R148 681.0 1705A SPECTRUM MONITOR Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.com 50 OHM TOP VIEW +11.8VF .001UF R173 750.0 C101 12PF R164 28.0...
Page 201 R127 J100 R128 J101 J200 R129 J201 R131 R132 J202 R142 J203 R143 R144 P100 R151 P101 R158 R159 R160 1705A Comp Diag R161 R231 R232 R241 R242 R243 R244 R247 R301 R302 R303 R304 U13A U13B U13C U13D U14A...
Page 202 --- 11.8V OFFSET --- 11.8V ZAXIS 4.75K 3.01K CR11 10.0K 2.00K <5> RO--- BLANK 30.1K <5> /RO--- EN READOUT INTENS --- 11.8V 1705A SPECTRUM MONITOR R243 J100 P100 1.00M HALF P101 SPAN R126 HALF R242 1.00M SPAN 100.0K J101 <5> /LBAND...
Page 203 CR17 R152 R228 CR18 R162 R229 R168 R230 R176 R308 R309 R177 R178 R179 R180 U21A R184 U21B U21C R185 R186 U26A R188 U26B R189 R190 U30A U30B R191 R192 U30C R193 R194 R197 R198 R199 R200 R204 1705A Diag...
Page 204 R134 1/2W +15V CR17 LM317 +15V +11.8V R116 CR18 .1UF 604.0 R111 10UF --- 15V +11.8V ADJUST R100 4.75K 1705A SPECTRUM MONITOR 15 KHz LOWPASS FILTER R210 20.0K 100PF +11.8V +11.8V R188 6.19K LF351 R209 R204 10.0K 10.0K .001UF LM318 .001UF...
Page 205 Assembly A3 and A3A1. Partial Assembly A3 also shown on Diagrams 1, 2, 3, and 4. Comp Comp Diag Comp Diag Diag R133 R245 R246 R300 J300 J414 P300 U12A U12B Q100 1705A Comp Diag A3A1 DS100 DS200 DS300 P100 P200 P800...
Page 206 .1UF --- 11.8V 150.0K 150.0K 10UF TRACE ROTATION +15V 100.0 CONNECTS 1/2W TO CRT 100.0 <8> .1UF --- 15V 1705A SPECTRUM MONITOR 8031 ONLY 0 OHM MICROPROCESSOR 8031 EA/VP P0.0 P0.1 33PF P0.2 P0.3 12MHZ P0.4 33PF P0.5 P0.6 10UF P0.7...
Page 207 The schematic diagram has an alphanumeric grid to assist in locating parts within that diagram. A2 Front Panel Board Static Sensitive Devices See Maintenance Section A4 18V Power Supply Board 1705A Assembly A2 and A4. Diag Comp Diag Comp DS112...
Page 208 C682 R681 .1UF 10.0K C684 C683 .01UF .01UF Q783 R682 R680 267.0K C782 7.50K +3.75V 10UF R685 15.0K 1705A SPECTRUM MONITOR VIDEO FILTER DS144 INPUT L BAND DS144A S109 LED_LBAND INPUT DS145 INPUT S139 70 MHz DS144C LED_70M SPAN/DIV DS330...
Page 209 Diag Diag Comp Diag Diag Comp Diag CR26 CR27 CR28 CR29 CR30 CR31 FIL1 FIL2 1705A (with cross-references to schematic diagrams 7 and 8). Diag Comp Diag Diag Comp Diag Diag Comp Diag Diag R101 R102 R103 * SEE PARTS LIST FOR EFFECTIVE SERIAL NUMBER RANGES...
Page 210 4.99K 3.74K LM393 4.99K .1UF +5VC 3.74K 10.00K 18.7K PEAK DETECTOR 1705A SPECTRUM MONITOR CAUTION: ALL CIRCUITRY TO THE LEFT OF THE ISOLATION BOUNDARY IS AT POWER LINE ISOLATION POTENTIAL AND REQUIRES BOUNDARY AN ISOLATION TRANSFORMER TO SERVICE CR10 NOT INSTALLED...
Page 211 The schematic diagram has an alphanumeric grid to assist in locating parts within that diagram. Assembly A1. Partial Assembly A1 also shown on Diagram 7. Comp Comp Diag Diag CR30 CR31 FIL1 FIL2 Assembly A10. Comp Diag 1705A Comp Diag Comp Diag R103 Diag Comp SKT1...
Page 212 FIL1 .1UF FIL2 Z AXIS AMPLIFIER NOT INSTALLED <7> J4--- 1 +100V .1UF 100K 3.74K <7> ZAXIS 13.0K NOT INSTALLED 1705A SPECTRUM MONITOR 22.1 +100V 10UF 10UF 10UF .015UF GRID DRIVE .015UF .015UF .01UF 100K BIAS .015UF .015UF 22.1K .001UF 100K .01UF...
Page 214: Replaceable Mechanical Parts
Replaceable Mechanical Parts...
Page 216: Using The Replaceable Mechanical Parts List
Section 10 Replaceable Mechanical Parts This section contains a list of the components that are replaceable for the 1705A. Use this list to identify and order replacement parts. There is a separate Replaceable Mechanical Parts list for each instrument. Parts Ordering Information Replacement parts are available from or through your local Tektronix, Inc., Field...
Page 217 (Column 8) 10- 2 Name & Description Detail Part of Assembly and/or Component Mounting parts for Detail Part *MOUNTING PARTS*/*END MOUNTING PARTS* Parts of Detail Part Mounting parts for Parts of Detail Part *MOUNTING PARTS*/*END MOUNTING PARTS* 1705A Spectrum Monitor...
Page 218 PANEL COMPONENTS CORP TK1373 PATELEC- - CEM (ITALY) TK1543 CAMCAR/TEXTRON TK1617 CRAFT FACTORY PLASTICS 1705A Spectrum Monitor CROSS INDEX - MFR. CODE NUMBER TO MANUFACTURER Address 17301 RIDGELAND 5825 N TRIPP AVE P.O. BOX 804238 3191 CASITAS 810 SE SHERMAN...
Page 219 ORDER BY DESCR 80126 B- - 0779 80009 337- - 3257- - 00 80009 337- - 3931- - 00 80009 200- - 3443- - 00 TK0435 ORDER BY DESCR 80009 253- - 0415- - 00 TK0435 ORDER BY DESCR 1705A Spectrum Monitor...
Page 220 426- - 2103- - 07 - - 55 211- - 0720- - 01 - - 56 211- - 0741- - 00 210- - 1011- - 00 1705A Spectrum Monitor 12345 Name & Description HOUSING,CKT BD:ALUMINUM *MOUNTING PARTS* SCREW,MACHINE:6- - 32 X 0.188,PNH,STL *END MOUNTING PARTS* TUNER:FREQ 950- - 1750MHZ,OUT IF FREQ 479.5MHZ,IMP...
Page 221 161- - 0215- - 00 TK1373 24230 80009 161- - 0066- - 11 70903 CH- - 77893 TK1179 865420000 80009 016- - 0475- - 00 80009 103- - 0158- - 00 80009 200- - 3897- - 01 1705A Spectrum Monitor...
Page 222 Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.com A3A1 1705A Spectrum Monitor...

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