1. Manuals
  2. Brands
  3. Wavetek Manuals
  4. Transmitter
  5. 3ST
  6. Operation manual

Wavetek 3ST Operation Manual

System sweep transmitter
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
OPERATION MANUAL
MODEL 3ST
SYSTEM SWEEP TRANSMITTER
This document contains information proprietary to
Wavetek. The information in this document
is not to be used or duplicated in any manner without
the prior approval, in writing, of Wavetek.
Wavetek
Wavetek
Wavetek
Wavetek
Wavetek
CATV Division
5808 Churchman Bypass
Indianapolis, IN 46203-6109
(800)851-1198
(317)788-5960
Fax: (317)782-4607
E-Mail: catvsupport@wavetek.com
Internet: http://www.wavetek.com
11/96 Rev. I,
Manual Part No.
6510-00-0273

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 3ST and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Summary of Contents for Wavetek 3ST

  • Page 1 MODEL 3ST SYSTEM SWEEP TRANSMITTER This document contains information proprietary to Wavetek. The information in this document is not to be used or duplicated in any manner without the prior approval, in writing, of Wavetek. Wavetek Wavetek Wavetek Wavetek Wavetek...
  • Page 2 This warranty is not transferrable and does not apply to used or demonstration products. The obligation of Wavetek arising from a Warranty claim shall be limited to repairing, or at its option, replacing without charge, any assembly or component (except batteries) which in Wavetek’s sole opinion proves to be defective within the scope of the Warranty.

  • Page 3: Table Of Contents

    Contents SECTION 1 - GENERAL INFORMATION 1.1 INTRODUCTION ..............1-1 1.2 SPECIFICATIONS ............. 1-2 1.2.1 Frequency ..............1-2 1.2.2 Level Measurement ........... 1-2 1.2.3 Hum Measurement ............. 1-2 1.2.4 Carrier to Noise Measurement ........1-3 1.2.5 Telemetry ..............1-3 1.2.6 Transmitter ..............1-4 1.2.7 Spectrum Mode ............
  • Page 4 3.2.3 Support Mode Selection Keys ........3-4 3.2.4 Arrow Keys ..............3-4 3.2.5 Alpha-Numeric Entry Keys ........3-5 3.2.6 Printing ................ 3-6 SECTION 4 - OPERATION - HOW TO USE THE 3ST TRANSMITTER 4.1 INTRODUCTION ............. 4-1 4.2 STEALTH SWEEP START-UP PROCEDURE ..4-1 4.3 SETUP ..................
  • Page 5 4.14 STATUS ................4-59 SECTION 5 - REVERSE SWEEP OPTION 5.1 INTRODUCTION ............. 5-1 5.1.1 Wavetek Stealth Reverse Sweep Concept ....5-1 5.1.2 Basic Reverse Sweep Procedure ......5-1 5.1.3 Interfacing With Different Network Architectures 5-2 5.2 HOW TO SETUP FOR REVERSE SWEEPING ..5-5 5.2.1 Enable or Disable Reverse Sweep ......

  • Page 6: Section 1 General Information

    Sweep response measurements won't be affected by signal levels changing in the headend. The Transmitter 3ST has all of the mea- surement capability of the 3SR Receiver, so the Headend Technician can keep an eye on headend levels.

  • Page 7: Specifications

    The 3ST Transmitter is a standard 19" rack mount unit, that weighs approximately fifteen pounds. Its 320 X 240 dot matrix LCD shows measurement data in both graphical and numerical form.

  • Page 8: Carrier To Noise Measurement

    Resolution: <0.2% Accuracy: +0.7% 1.2.4 Carrier to Noise Measurement Non-scrambled channels only. No preselection required for 78 channels at +10 dBmV input level. Carrier to Noise Ratio Depth of Measurement Characteristics Out of Measurement Range Video Carrier Level (dBmV) *Specified results with the measurement offset within 2 to 3 MHz range above the video carrier.”...

  • Page 9: Transmitter

    1.2.6 Transmitter Frequency Range: 5 to 1,000 MHz Level Range: +20 to +50 dBmV ; settable in 2 dB increments Spectral Purity: Hars -30 dBc; Spurs -35 dBc 1.2.7 Spectrum Mode Spans: 3, 5, 10, 20, and 50 MHz (0.3, 0.5, 1, 2, and 5 MHz/div) Sweep Rates: 2 seconds (50 &...

  • Page 10: Depth Of Modulation

    +0.5 dB (typical) Flatness: +0.5 dB @ 25 °C, @ 20 dBmV Dimensions: Transmitter 3ST: 48.3 cm (W) x 13.3 cm (H) x 35.6 cm (D), 19" (W) x 5.25" (H) x 14" (D) Weight: Transmitter 3ST: 6.8 kg (15 lbs.)

  • Page 11: Standard Accessories

    Fuse 1.25 A, 250V 5X20mm SLO-BLO (2 required) 1.2.13 Standard Accessories Line Cord Channel Plan Transfer Cable Operations Manual 1.2.14 Options 16/64 QAM Digital Carrier Power Measurement - Enables Stealth to perform accurate level measurements on digital carriers. 1.2.15 Optional Accessories 1010-00-0342 Citizen PN60 (thermal fusion) Printer 1019-00-0457...
  • Page 12 Specification Change - The transmitter output is being changed from +10 to +40 dBmV to +20 to +50 dBmV. To determine which transmitter output range is available on your unit, access the Status screen by pressing the FCN key followed by the status second function key.

  • Page 13: Section 2 Installation

    SECTION 2 INSTALLATION 2.1 INTRODUCTION This section provides information on how to install the 3ST Transmit- ter. 2.2 UNPACKING AND INSPECTION The instrument was inspected, and given final operational and quality control tests prior to being carefully packaged for shipment. The unit should operate in accordance with the specifications listed in this manual.

  • Page 14: Warranty Information

    The output level will be attenuated by the tap value of the directional coupler. For example, if a sweep signal level of +16 dBmV is desired on the system and the output of the 3ST Transmitter is set to +36 dBmV, a directional coupler value of 20 dB may be used, or the combination of a lower value directional coupler and an attenuator pad.

  • Page 15: Power Requirements

    The Sweep System Transmitter 3ST operates on 90-265 VAC, 57-63 Hz single phase input power source. 2.6 CABLE SPECIFICATIONS There are two cables associated with the operation of the 3ST Transmitter; Stealth to Stealth, and a Serial Printer cable. The following information describes each of the associated cables.
  • Page 16 Serial Printer Cable The Serial Printer Cable, (1217-50-0151) can be used to print data directly from the 3ST Transmitter.

  • Page 17: Technical Support

    2.7 TECHNICAL SUPPORT Although we've worked hard to make the 3ST as easy-to-use as possible, the wide range of network architectures available today can make proper configuration a difficult task. If you have a problem using your unit you can contact Wavetek's Technical Support for help.
  • Page 18 Specification Change - The transmitter output is being changed from +10 to +40 dBmV to +20 to +50 dBmV. To determine which transmitter output range is available on your unit, access the Status screen by pressing the FCN key followed by the status second function key.

  • Page 19: Section 3 User Interface

    SECTION 3 USER INTERFACE 3.1 INTRODUCTION This section will help you become familiar with the front-panel controls of the Model 3ST Transmitter. Included are descriptions of the front-panel and notes on the use of features. 3.2 FRONT-PANEL DESCRIPTION The hardware portion of the user interface consists of a 320x240 dot matrix LCD and a 40-key keypad.

  • Page 20: Measurement Mode Selection Keys

    3.2.2 Measurement Mode Selection Keys Measurement modes are chosen by pressing the appropriate Mea- surement Mode Selection key. There is a key for each of the eight major measurement functions. These keys are located directly below the display. LEVEL: Signal level measurements on individual channels are made by entering a specific channel number and pressing the channel key.
  • Page 21 SCAN: Use the Scan mode to get a good look at absolute carrier levels. In this mode a bar graph showing all carrier levels is displayed. SWEEP: This mode injects a low level signal in vacant spectrum areas, and transmits telemetry to any 3SR Receivers that are connected to the system.

  • Page 22: Support Mode Selection Keys

    3.2.3 Support Mode Selection Keys Support modes are accessed using the Support Mode Selection keys. There is a key for each of the four support functions. These keys are located to the right of the display. Allows the user to access measurement files. File: Auto: This function provides automated FCC 24 hour testing...

  • Page 23: Alpha-Numeric Entry Keys

    3.2.5 Alpha-Numeric Entry Keys The Alpha-Numeric keys are used to enter data as needed during the operation of the unit. There are three indicators associated with keypad entry. These indicators appear in the title bar to the left of the time. The three are as follows: C - alpha entry mode 3 - numeric entry mode - multiple choice mode...

  • Page 24: Printing

    Alpha Entry Mode Most numeric keys have alphabetic characters printed on them. These characters can be accessed when the alpha entry indicator appears in the title bar. In the alpha entry mode, a cursor appears below the active position. Repeated pressing of an alphanumeric key sequences through the values printed on the key.

  • Page 25: Section 4 Operation - How To Use The 3St

    Stealth Transmitter Stealth Receiver Sweep insertion is prior to sampling of system levels by 3ST Transmitter The Model 3ST's output may be injected as shown above, using a directional coupler at the output of the combining network, or it may even be injected at an input to the combining network.
  • Page 26 We recommend that the telemetry be set at 10 dB below the video carrier level. Any response irregularities caused by the combining network will be eliminated in the normalization process. After the transmitter is properly connected, the next step is to build a channel plan.
  • Page 27 Editing A Channel Plan The next step is to edit the channel plan to characterize it for your particular system. Cursor down to Edit Channel Parameters and press ENTER. A listing of all the channels within the frequency range designated in the Build Channel Plan phase will appear on the screen.

  • Page 28: Setup

    The next step is to test the sweep by connecting the Model 3SR receiver to a test point and pressing the SWEEP key (Ensure the 3ST Transmitter is also in the Sweep mode). After telemetry is found, the receiver will begin sweeping. If telemetry is not found make sure the 3ST Transmitter and the 3SR Receiver are configured for the same telemetry frequency.

  • Page 29: General Setup

    4.3.1 General Setup Use the Up and Down soft keys to scroll to additional setup items. When lists are being displayed, the up arrow soft key dims when the first item in the list is reached and the down arrow soft key dims upon reaching the last item.
  • Page 30 Operator Name Allows the user to enter the operators name. The name will appear in the header section of the Auto Test report. Contrast Level Adjusts the contrast level of the LCD for optimum viewing by the operator. The level is varied on a scale from 1-15. Use the UP and DOWN arrow keys to adjust the contrast.
  • Page 31 Sets the printer interface to the specific type of printer used. Use the UP and DOWN arrow keys to select the desired printer. The re- quired serial printer configuration is as follows: • baud rate consistent with 3ST (recommend 9600 or 19.2K) • 8 data bits • 1 stop bit •...

  • Page 32: Measurement Setup

    Beeps The 3ST Transmitter produces beeps to alert you of certain operat- ing conditions. The arrow keys are used to turn Beeps on or off as desired. Diagnostics Press the ENTER key to enter the diagnostic mode. The diagnostic mode allows the user to reset the unit to all factory default settings.
  • Page 33 Signal Level Units Use the UP and DOWN arrow keys to select the desired level units (dBmV, dBµV, dBm). Test Point Compensation Test Point Compensation is used to account for loses associated with certain amplifiers. Use the UP and DOWN arrow keys or the numeric entry keys to enter the Test Point Compensation.

  • Page 34: How To Setup Your Channel Plan

    4.3.3 How To Setup Your Channel Plan The procedure explained in Section 4.2 should be performed when first using the Model 3ST Transmitter. Select Channel Plan Press the ENTER key to call up a list of existing channel plans. If the unit is being used for the first time, the only Channel Plan available will be the standard NCTA plan.
  • Page 35 This sequence allows the user to create a channel plan by "learning" the channels on a cable system. NOTE: Ensure that the 3ST Transmitter is connected to the cable system. Step 1: Enter a name for the new channel plan that will be built.

  • Page 36: How To Edit Channel Parameters

    Press the ENTER key followed by the OK soft key to set the stop frequency. The 3ST Transmitter will sequence through all channels in the selected fixed plan until the stop frequency is reached. This opera- tion can be terminated by pressing the STOP soft key. When com- pleted, individual channels contained in the newly built plan can be edited.
  • Page 37 Use the UP or DOWN arrow keys to select the channel that you wish to edit. Press the EDIT soft key to view and edit the following parameters: 4-13...
  • Page 38 Note: If the parameter that you wish to edit does not appear on the screen, keep pressing the arrow soft key to scroll through the list. Enabled Y/N - If the channel is not enabled it will not be included in any measurement modes.
  • Page 39 Label The label is provided to associate a channel's number with it's programming. Using the alpha keys, label the channel with a desired name (up to four characters). "Special" characters can be selected using the up/down arrow keys. The label will appear to the left of the channel number on most screens.
  • Page 40 Scrambled Y/N - Select Yes if the channel is scrambled. When a channel is designated as scrambled, the sweep will only look at the video carrier as a sweep reference, instead of both the video and audio carrier. Note: a diamond will appear to the left of the channel type indicator on most screens.
  • Page 41 If sweep points are entered in the following frequency ranges they will be automatically shifted to avoid measurement inaccuracies. 197.88 to 198.12 lower to 197.87 441.13 to 441.37 lower to 441.12 496.13 to 496.37 lower to 496.12 827.63 to 827.87 lower to 827.62 882.63 to 882.87 lower to 882.62...
  • Page 42 Use the Up and Down arrow soft keys to cursor to a channel. Use the C/N, HUM, and MOD soft keys to select the desired Auto Test measurements. Note: C/N, Hum, and Modulation cannot be measured on a scrambled channel or a sweep point. Hum and Modulation cannot be measured on a Digital type carrier.
  • Page 43 Copy Remote Plan This selection allows you to copy a channel plan from one unit to another. Connect a cable between the serial ports of two units. Ensure that the baud rate is set the same for each unit (General Setup screen). A baud rate of 19.2K is recommended for uploading plans.

  • Page 44: Sweep Transmitter

    Forward Telemetry Level This is the level of the carrier that the 3ST uses to transmit telem- etry data. Use the edit box to set the Telemetry Level to an appro- priate value. When adjusting the Telemetry Level, take into consid- eration the following losses;...
  • Page 45 Forward Sweep Insertion Level This is the level at which the 3ST inserts (transmits) sweep points. All sweep points are inserted at the same level. Use the edit box to set the Sweep Insertion Level to an appropriate value (This will typically be at maximum (+50 dBmV) to over come test point loss.).

  • Page 46: How To Perform Level Measurements

    IMPORTANT: The frequency the reverse telemetry carrier should be carefully selected such that it will not interfere with any existing carriers on the reverse plant. Access Reverse Sweep Plans Reverse Sweep Plans are used to define the frequencies at which sweep points will be inserted by 3SR units with the Reverse Sweep option.
  • Page 47 Label (up to four characters) Scrambled Channel Type: TV Channel Single Number Dual (0-999) Freq. Mode • Channel number or frequency • Channel label • Video carrier frequency and level (numerical) • Audio carrier frequency and level (numerical) • Analog meter of carrier levels •...

  • Page 48: How To Measure Tilt-Balancing An Amplifier

    Scale Adjustment The UP and DOWN arrow keys can be used to adjust the reference level on the analog meter. This is helpful when the audio and video levels differ by large amounts. To automatically scale the analog meter, press the FCN key followed by the Scale second function key.
  • Page 49 Information displayed in the Tilt mode is as follows: • High and low carrier frequencies • High and low carrier levels • Tilt measurement • Reference level and scale • Selected channel plan • Test point compensation (appears only if a nonzero value is programmed during setup) When the TILT key is pressed the screen will automatically display up to nine video carrier levels that were defined in the Edit Channel...

  • Page 50: Scan Mode

    To adjust the Ref Level, press the Ref Level soft key. Now the Ref Level can be changed by using the UP and DOWN arrow keys or by entering a numeric value followed by the ENTER key. The refer- ence level is at the top of the graph. NOTE: The reference value is limited by unit and the scale setting.
  • Page 51 • Audio carrier frequency and level (numerical) • Histogram graph of carrier levels • Delta between audio and video levels • Selected channel plan • Test point compensation (appears only if a nonzero value is programmed during setup) • Limits annunciators When the SCAN key is pressed a graph showing all carrier levels is displayed.
  • Page 52 Press the TILT soft key to turn tilt compensation on or off. Tilt channels must be programmed in the Channel Plan Edit mode, before this function can be implemented. The tilt is based on the levels of the highest and lowest channels configured for tilt. When turned on, the compensation value can be adjusted using the UP and DOWN arrow keys or by entering a numeric value followed by the ENTER key.
  • Page 53 • Adjacent Channel Error • Video Level Too High/Low • ∆VA Too High/Low The limit annunciators are updated with each scan update. An "aggregate" result summary can be accessed by pressing the LIM soft key. This performs a limit check of all channels contained within the scan and reports an overall pass/fail conclusion.

  • Page 54: How To Measure C/N

    4.7 HOW TO MEASURE C/N It is a good engineering practice to use a bandpass filter on the input of the receiver when making C/N measurements. This is to ensure accuracy and extend measurement range. If a preamplifier is used to boost test point levels prior to measurement, it should be placed between the bandpass filter and the receiver.
  • Page 55 Information displayed in the C/N mode is as follows: • Channel number • Channel label • Carrier frequency • Noise offset frequency • Noise frequency • Bandwidth • C/N ratio • Channel plan To make a carrier to noise measurement, press the C/N key. The C/N ratio of the tuned channel or frequency will be displayed.

  • Page 56: How To Measure Hum

    4.8 HOW TO MEASURE HUM Hum is undesirable modulation of the television video carrier by power line frequencies and harmonics (e.g., 60 or 120 Hz), or other low frequency disturbances (FCC limit: < 3%). To measure Hum, simply press the Hum key when tuned to any non-scrambled chan- nel.

  • Page 57: Modulation

    Note: The <1kHz setting does not include the 1Hz component, it only includes 50 to 1000Hz. Information displayed in the Hum mode is as follows: NOTE: HUM measurements taken while the desktop charger is in use will affect the HUM reading. For the most accurate reading disconnect the charger prior to taking HUM measurements.

  • Page 58: Spectrum Analyzer Mode

    4.10 SPECTRUM ANALYZER MODE The spectrum analyzer display provides a view of the system spectrum with variable spans from 50 MHz to 3 MHz and a dynamic range of better than 60 dB. When the Spectrum key is pressed, the following screen is displayed.
  • Page 59 Level Adjustments A LVL (level) soft key is used to adjust the vertical parameters of the graph. These parameters include Max Hold, Ref Level and Scale. The Max Hold function ensures that the highest signal over multiple sweeps is displayed. When the Max Hold soft key is pressed, as indicated in the left hand corner of the display, the highest signal level is displayed.
  • Page 60 How To Make FCC In-Channel Response Measurements (FCC limit: , + 2 dB) The frequency response of any channel can be measured using the spectrum analyzer mode. A flat signal source must be inserted at the input of the modulator or processor. In testing a modulator this source may be a full field multiburst signal, or a sweeping function generator.
  • Page 61 Press the OK soft key once the carrier has been turned off. The CSO/CTB measurement is now displayed. 4-37...
  • Page 62 The light trace represents the carrier prior to it being turned off. The dark trace represents the distortion products. The measurement value is computed by a ratio of the peak level of the video carrier to the peak of the distortion products of the second and third order beats.

  • Page 63: Sweep Mode

    4.11 SWEEP MODE The Transmitter Sweep mode operates the same as the Scan mode with the following exceptions: • Sweep telemetry is transmitted • Sweep points are injected • Sweep point levels are displayed in the graph NOTE: Sweep telemetry will cease when another mode is selected. 4-39...

  • Page 64: File

    4.12 FILE The File menu consists of two File submenus; Store Measurement, and Measurement Files. 4.12.1 How to Store/View/Delete Measurement Files The Store Measurement feature allows the user to store sweep, spectrum and scan measurements. To store a measurement, press the File key while taking the measurement.
  • Page 65 To view measurement files, press the Measurement Files soft key. A listing of all currently stored measurement files is displayed. Use the UP and DOWN arrow keys to select the file to be viewed. Once selected, press the View soft key. Scan measurements can be stored, but can only be viewed/printed using the Stealthware Data Analysis software.

  • Page 66: Auto

    4.13 AUTO The Auto menu consists of three File submenus; Test Locations, Perform Auto Test, and Auto Test Results. 4.13.1 How To Create/Edit/Delete Test Locations Test Locations allow the user to create specific test point location parameters used in the Auto Test report. The Test Locations can be created directly on the Stealth unit, or using the SteathWare Data Analysis software and downloaded to the Stealth unit.
  • Page 67 Press the New soft key to create a new Test Location file. The unit will then prompt for a file name. Once a name is entered, press the OK soft key to execute the operation. 4-43...
  • Page 68 Each location in the list has an associated type and values for the descriptive parameters. The parameters are shown in the following table. Parameter Default Units 1 Area 15 column alpha numeric field 2 Amp Id 15 column alpha numeric field 3 Power Configuration IN / OUT / THROUGH 4 Feeder Maker Config...

  • Page 69: How To Perform An Auto Test

    Characteristic Trunk Head Extender Fiber Field 1 Area 2 Amp Id 3 Power Configuration yes 4 Feeder Maker Config yes 5 Trunk Termination 6 Voltage Setting 7 Rev Pad 8 Rev Equalizer 9 Fwd Pad 10 Fwd Equalizer Editing of location files is done by pressing the Edit soft key. The optional fields will be enabled or disabled according to the location type selected (see table above).
  • Page 70 Auto Test Location Using the Up and Down arrow keys, select an Auto Test location. Select NONE if location information is not desired. Press the OK soft key when completed. To create a new Auto Test location, press the New soft key. Auto Test Characteristics 4-46...
  • Page 71 Use Up and Down arrow keys to scroll through the location character- istics for the test being performed. Press the ENTER key after each parameter is entered to update the display. If changes are made and you want them updated in the location file, press the Save soft key. If changes are made and the Save soft key is not pressed, the changes will only affect the Auto Test that is about to be performed.
  • Page 72 Voltage Measurements Use the numeric entry keys to enter the following system voltage measurements: • AC Voltage • DC Voltage (regulated) • DC Voltage (unregulated) The voltage measurements are printed in the Auto Test report. Press the OK soft key when completed. 4-48...
  • Page 73 Test Point Compensation Test Point Compensation is used to account for loses associated with certain amplifiers. Use the UP and DOWN arrow keys or the numeric entry keys to enter the Test Point Compensation. (-100.0 to +100.0 dB in 0.1 dB steps). Press the OK soft key when the desired value has been entered.
  • Page 74 Results File Enter a file name for the Auto Test results to be stored. If an existing file name is used, a warning message will appear prompting the user to overwrite the existing file or create a new one. When the desired file name has been entered, press the OK soft key to proceed with the Auto Test.
  • Page 75 While the Auto Test is in progress, the measurement currently being performed (i.e. Level, C/N, Hum, or Modulation) is indicated on the screen. A bar graph showing the percentage of completion is dis- played. Scheduled If the Scheduled mode is selected, the start, stop, and interval information must be entered prior to commencing the Auto Test.
  • Page 76 Using the numeric entry keys, enter the start and stop information for the date and time as well as the interval amount. Press the ENTER key after each parameter is entered to update the display. Use the Up and Down arrow soft keys to select the parameter to be entered. Press the OK soft key to commence the Schedule Auto Test.

  • Page 77: Viewing/Printing Auto Test Files

    4.13.3 Viewing/Printing Auto Test Files Upon completion of the Auto Test, the unit will enter the Auto Test Results Mode to display the Auto Test files. This allows the user to view or print the Auto Test results. Use the Up and Down arrow soft keys to select a file, then press the View soft key.
  • Page 78 Information provided on each interval includes: • Interval number • Date measurement was made • Time measurement was made • Temperature • Pass/Fail test results An "X" in the Pass/Fail column indicates an overall failure of the measurements taken during that interval. A check mark indicates that all measurements were within the specified limits.
  • Page 79 ------------------------------------------------------------------------- WAVETEK STEALTH 24 HOUR TEST REPORT Model: 3ST Serial No: 1234567 Cal Date: 06/21/95 ------------------------------------------------------------------------- Operator: JOHN File: PROOF1 ------------------------------------------------------------------------- Location Name: 1028_ELM_ST Location Type: Trunk Test Point Type: Forward Trunk In Test Point Compensation: +0.0 dB ------------------------------------------------------------------------- Area:...
  • Page 80 The channels with the asterisks indicate those channels that ex- ceeded the Max Delta Adjacent Channels limit. The limits that the readings were compared to, are printed at the bottom of the report. To the right of the limits, the report displays each interval that failed the specific limit.
  • Page 81 Use the More soft key to toggle between Level measurements, C/N, Hum, and Modulation measurements. When viewing the list of C/N, Hum, and Modulation measurements, the following symbols will replace the measurement value if an error occurred: • UNDER - under range •...
  • Page 82 ------------------------------------------------------------------------- WAVETEK STEALTH AUTO TEST REPORT Model: 3ST Serial No: 1234567 Cal Date: 06/21/95 ------------------------------------------------------------------------- Operator: JOHN File: PROOF1 Inverval: 1 Date: 07/20/95 Time: 15:18:09 Temp: 75 F ------------------------------------------------------------------------- Location Name: 1028_ELM_ST Location Type: Trunk Test Point Type: Forward Trunk In Test Point Compensation: +0.0 dB...

  • Page 83: Status

    4.14 STATUS To view the Status screen, press the FCN key followed by the Status second function key. The Status screen provides unit information to the user. An important feature is the amount of memory currently being used. This allows the user to decide if unwanted files should to be deleted to make more memory available for newer files.

  • Page 84: Section 5 Reverse Sweep Option

    5.1.1 Wavetek Stealth Reverse Sweep Concept With the reverse sweep option, a transmitter is built into the hand- held sweep receiver. The headend sweep transmitter (3ST) is set up to receive the reverse sweep sent from the field. When a reverse...

  • Page 85: Interfacing With Different Network Architectures

    1. The connections are similar to those made for forward sweep, with the transmitter output connected to the combin- ing network. The difference is on the input to the 3ST transmitter. The system signals along with the transmitted signals are tapped off and coupled together with the reverse signals using a splitter.
  • Page 86 In these architectures the installation of the transmitter in the headend is slightly modified, as shown in figure 3. Notice that a diplex filter is used on the input of the 3ST Transmitter. This provides optimal isolation between forward paths and minimal insertion loss.
  • Page 87 Combining Network System Sweep Transmitter 3ST FILE AUTO SETUP PRINT SWEEP LEVEL TILT SCAN SPECT Figure 3. Transmitter Connections In Headend For Hybrid Fiber/Coax Networks Figure 4. Fiber Node Test Point Connections Dual Cable Network Another possible, though rare, network configuration is the "Dual Cable Network", in which a full bandwidth is used for both forward...

  • Page 88: How To Setup For Reverse Sweeping

    5.2 HOW TO SETUP FOR REVERSE SWEEPING To setup the Reverse Sweep on the 3ST, press the SETUP key and select the “Sweep Transmitter” option from the Setup menu. The Sweep Receiver setup screen will appear.

  • Page 89: Select The Frequency Of The Reverse Telemetry Carrier

    IMPORTANT: Reverse Sweep should be disabled when there are no 3SR units being used with the Reverse Sweep option. This will optimize the update rate of the Forward Sweep. It should also be disabled if you are using the 3HRV for reverse sweeping. 5.2.2 Select the Frequency of the Reverse Telemetry Carrier This is the frequency at which 3SR units with the Reverse Sweep option will transmit telemetry data.

  • Page 90: Creating A New Reverse Sweep Plan

    5.2.5 Creating a New Reverse Sweep Plan Press the New soft key to create a new Reverse Sweep Plan. You will be asked to enter a name for the plan that you are creating. Use the alphanumeric keys followed by the ENTER key. Then press the OK soft key to continue.
  • Page 91 Next, enter the Start Frequency. This will be the frequency of the first sweep point in the plan. Use the numeric keys followed by the ENTER key. Then press the OK soft key to continue. The Interval is entered next. This interval determines the spacing between sweep points.
  • Page 92 Finally, you are asked to enter the Stop Frequency. There will be no sweep points generated beyond the Stop Frequency. Use the numeric keys followed by the ENTER key. Then press the OK soft key to continue.

  • Page 93: Editing A Reverse Sweep Plan

    Sweep points are generated beginning at the Start Frequency and continuing until the Stop Frequency is reached. The frequency of each point is calculated by adding the Step Interval to the frequency of the previous point. After it has been created, the new plan will appear in the Reverse Sweep Plan list.
  • Page 94 Note that the frequency of the selected sweep point also appears in the edit box below the list. You can change the frequency by using the numeric keys followed by the ENTER key. The list will be updated when the ENTER key is pressed. To remove a sweep point, use the up or down arrow to select the point to be removed, then press the Delete soft key.

  • Page 95: Appendix A: Status Indicators

    INTRODUCTION There are numerous status indicators/icons displayed on the Stealth 3ST. The following is a list of all status indicators/icons and an explanation of each. The status indicators are displayed in the title bar as shown in the example below.

  • Page 96: Appendix B User Messages

    APPENDIX B USER MESSAGES INTRODUCTION There are numerous user messages that will appear on the unit. Some messages can be caused by improper operation or unit malfunc- tion. The following list provides an explanation of the condition that caused the message to appear, followed by the suggested response: Message ERROR...
  • Page 97 Message ERROR... Insufficient signal level to perform the measurement! Condition A minimum carrier level is required for C/N and HUM measurements. Response Choose another channel or frequency with greater than the minimum level. Message SORRY... This is an illegal name and cannot be used.
  • Page 98 Message ERROR... The selected reference has been corrupted! Condition The reference cannot be used because of a non-volatile memory failure. Response Delete the corrupted reference and select another. Message SORRY... Not enough sweeps have occurred to store an accurate reference. Please allow more time in SWEEP.
  • Page 99 Message SORRY... There is not enough memory to store a new file! Condition Memory is currently at maximum capacity. Response Delete unwanted files to make more memory available. Message WARNING... The selected sweep file will be deleted! Condition A sweep file is about to be deleted. Response Press OK to delete.
  • Page 100 cancel. Message SORRY... The active plan cannot be deleted! Condition An attempt to delete the active channel plan. Response Select a different plan as the active plan, then delete the desired plan. Message ERROR... This plan is corrupted and cannot be used! Condition The plan cannot be used because...
  • Page 101 Response Press OK to delete, STOP to cancel. Message SORRY... The last channel cannot be deleted! Condition An attemp was made to delete the last channel of a plan. Response A channel plan must contain at least one channel. If desired, delete the entire plan.
  • Page 102 Response Press OK to reset settings, STOP to cancel. Message ERROR... C/N cannot be measured on a scrambled channel! Condition A channel that has been programmed as scrambled in setup has been selected in C/N mode. Response Select a channel that is not scrambled.

Table of Contents