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Aeroflex NAV 2000R Operation Manual

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OPERATION MANUAL

NAV 2000R
SIGNAL GENERATOR
MANUAL NUMBER: 06-0520-5A (Hard Copy)
E6-0520-5A (CD-ROM)
REVISION: 0
DATE: 07/26/2007
WARNING: INFORMATION SUBJECT TO EXPORT CONTROL LAWS
This document contains controlled technology or technical data under the jurisdiction of the Export Administration
Regulations (EAR), 15 CFR 730-774. It cannot be transferred to any foreign third party without the specific prior
approval of the U.S. Department of Commerce Bureau of Industry and Security (BIS). Violations of these
regulations are punishable by fine, imprisonment, or both.
This document is proprietary to Aeroflex, and is not to be reproduced or otherwise
disseminated without the written consent of Aeroflex.
400 New Century Parkway – New Century, Kansas – 66031
Telephone: (800) 237-2831 / (913) 764-2452 Fax: (913) 782-5104
www.aeroflex.com

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  • Page 1: Operation Manual

    U.S. Department of Commerce Bureau of Industry and Security (BIS). Violations of these regulations are punishable by fine, imprisonment, or both. This document is proprietary to Aeroflex, and is not to be reproduced or otherwise disseminated without the written consent of Aeroflex.
  • Page 2 ELECTROSTATIC DISCHARGE GENERAL WARNINGS FOR ALL EQUIPMENT CAUTION: THIS EQUIPMENT MAY CONTAIN ELECTROSTATIC DISCHARGE (ESD) SENSITIVE COMPONENTS. TO PREVENT ESD SENSITIVE EQUIPMENT FROM POSSIBLE DAMAGE, OBSERVE THE FOLLOWING PRECAUTIONS WHEN HANDLING ANY ESD SENSITIVE COMPONENTS, OR UNITS CONTAINING ESD SENSITIVE COMPONENTS: Maintenance or service personnel must be grounded though a conductive wrist strap, or a similar grounding device, using a 1 MΩ...
  • Page 3 DRAWING NO. _LEVEL DRAWING NO. LEVEL Safety and Regulatory 00 Table of Contents Section I Section II Section III Section IV Section V Appendix A DRAWING REVISION HISTORY – NAV 2000R – JULY 26, 2007 – PAGE 1 OF 1...

  • Page 5: Safety And Regulatory

    Three-phase alternating current. This symbol indicates that the equipment requires 3-phase ac input. Earth (ground) terminal. This symbol indicates the ground (earth) terminal. SAFETY AND REGULATORY INFORMATION NAV 2000R – REVISION 0 – JULY 26, 2007 - PAGE 1...
  • Page 6 Out-position of a bistable push control. This symbol indicates the out (off) position of a bistable push control. CE Mark. ™ of the European Community. Fuse Symbol. To indicate a fuse. SAFETY AND REGULATORY INFORMATION NAV 2000R – REVISION 0 – JULY 26, 2007 - PAGE 2...
  • Page 7 (from a drop or fall) should be checked by service personnel for loose or damaged parts inside. See parts lists for approved replacement parts. SAFETY AND REGULATORY INFORMATION NAV 2000R – REVISION 0 – JULY 26, 2007 - PAGE 3...
  • Page 8 United States (transmit an over the air signal) a station license must be in effect for your location in accordance with FCC Part 87 rules. SAFETY AND REGULATORY INFORMATION NAV 2000R – REVISION 0 – JULY 26, 2007 - PAGE 4...

  • Page 9: Table Of Contents

    SELCAL MODE ..................3-19 3.5.14 UTILITY MENU..................3-21 3.5.15 EXTERNAL MODULATION MODE............3-23 3.5.16 CALIBRATION MODE................3-23 3.5.17 DISPLAY DEFINITION DURING POWER ON SEQUENCE ....3-24 TABLE OF CONTENTS - NAV 2000R – REVISION 0 – JULY 26, 2007 - PAGE TC-1...
  • Page 10 INTERNAL & EXTERNAL MODULATION SUMMING......4-16 4.5.9 AUDIO HIGH/LOW INDICATION ............4-16 4.5.10 % MODULATION LEVEL SET ATTENTUATOR ......... 4-17 4.5.11 % MODULATION CENTERING & CALIBRATION ......4-17 TABLE OF CONTENTS - NAV 2000R – REVISION 0 – JULY 26, 2007 - PAGE TC-2...
  • Page 11 (-50 UNIT WITH MOD STATUS 7)............4-25 SECTION V MAINTENANCE INFORMATION BILLS OF MAT, ASSY DWGS, SCHEMATICS & TEST PROCED ..5-1 APPENDIX A GPIB COMMAND QUICK REFERENCE ..........A-1 TABLE OF CONTENTS - NAV 2000R – REVISION 0 – JULY 26, 2007 - PAGE TC-3...

  • Page 12: General Information

    Aeroflex Operation Manual SECTION I GENERAL INFORMATION 1.1 GENERAL INFORMATION The Aeroflex NAV 2000R generates ADF, MARKER BEACON, HF/VHF, COM and SELCAL signals for test applications. 1.2 EQUIPMENT DESCRIPTION The NAV 2000R VOR/ILS/COM Signal Generator contains necessary hardware and firmware to provide modulated RF signals to verify operation of VOR navigational, ILS (Glideslope, Localizer, and Marker Beacon), and COM communications LRU systems for aircraft.

  • Page 13: Section Ii

    10 years minimum data retention in the absence of external power. Data Input / Output Compatible with IEEE Standard 488-1978 Electrical Specifications Power Requirements 115/230 V 60/50 Hz 750 mA max, 70 W NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 1-2...
  • Page 14 < -30 dBc Non-harmonics < -60 dBc at > 5 kHz from carrier SSB Phase Noise < -115 dBc/Hz at > 25 kHz from carrier (CW only) NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 1-3...
  • Page 15 ± 0.01 degree relative to calibration standard used during Radial accuracy (Audio) calibration. ± 0.05 degree relative to calibration standard used during Radial accuracy (RF) calibration. NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 1-4...
  • Page 16 ±0.0053 @ 0.200 DDM GLIDESLOPE mode Modulation tones Frequencies 90 Hz, 150 Hz ± 0.005% Frequency accuracy ± 10% Frequency adjustment range Distortion (audio) < 0.1% THD NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 1-5...
  • Page 17 10 Hz to 18 kHz Adjustment Resolution 0.1 Hz ± 0.005% Frequency Accuracy Distortion (audio only) < 0.1% THD Amplitude modulation Range Preset Variable 0 to 99% in 0.01% increments NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 1-6...

  • Page 18: Units And Accessories Supplied

    JPN 01-0520-50 NAV 2000R CD Operation Manual JPN E6-0520-5A Detachable Power Supply Cord 1.5 UNITS AND ACCESSORIES REQUIRED The NAV 2000R requires the following items to be interconnected to a remotely operated test equipment environment. ITEM DESCRIPTION TYPE GPIB Cable It is recommended that a HP type 10833X braided shield cable, or equivalent, be used.

  • Page 19: Optional Equipment

    If you have any questions regarding service, you may contact the factory at the address listed below: Aeroflex 400 New Century Parkway New Century, KS 66031 Phone: (913) 764-2452 Fax: (913) 782-5104 http://www.aeroflex.com NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 1-8...

  • Page 20: Installation

    2.3 EQUIPMENT INSTALLATION The NAV 2000R VOR/ILS/COM generator is manufactured as a bench test unit, but may be rack mounted using optional rack mount handle flanges.

  • Page 21: Operation

    IEEE Standard 488-1978, "Standard Digital Interface For Programmable Instrumentation." 3.2 FRONT PANEL DESCRIPTION Figure 3-1 shows the NAV 2000R front panel. Shown on the Figure are the display (including its fields), the mode select keypad, cursor keypad and select key, hot keys keypad, numeric keypad, power switch, and RF output connector.

  • Page 22: Rear Panel Description

    To turn on the NAV 2000R, press the power button located at the bottom left corner of the front panel. Upon power up, the NAV 2000R will perform a self-test and when complete will indicate self-test results on the display.

  • Page 23: Nav 2000R Modes

    Aeroflex Operation Manual 3.5.1 NAV 2000R MODES The NAV 2000R local operation is menu driven through the use of mode menu pages. There are six generator modes and three utility modes. Each top level generator mode menu is accessed by pressing the corresponding mode menu select key.

  • Page 24: Getting Around In The Menus

    NAV 2000R. 3.5.3 GETTING AROUND IN THE MENUS All front panel user inputs to the NAV 2000R are entered through selection of menu page fields. Each mode of operation has a set of pre-defined user programmable items. These items are programmed through the menu page display fields.

  • Page 25: Changing Field Data / Alphanumeric

    While editing, if the value of the numeric data moves outside its standard setting, two asterisks ('*') are displayed, one on each side of the field. The NAV 2000R output signal changes immediately during editing. This enables real time skewing of numeric parameters.

  • Page 26: Entering Field Values With The Keypad

    DDM value will be accepted but the message "NON-STANDARD DDM VALUE" will appear. Pressing the 90 Hz or 150 Hz hot keys will toggle the indicated tone off or on. NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 3-6...

  • Page 27: Rf Level Entry

    FREQ. MHz This field allows the RF frequency to be programmed. The RF frequency may be programmed in 0.00001 MHz steps within the NAV 2000R frequency range of 0.15000 MHz to 450.00000 MHz. CHANNEL This field steps the RF frequency output up and down in 50 KHz steps using the cursor control up and down arrow keys.
  • Page 28 Aeroflex Operation Manual AUDIO Selecting the audio control mode field places the NAV 2000R into VOR audio control mode. The audio control mode, designated as the "VORa" mode, commands the NAV 2000R to allow the VOR audio composite output to be varied. Within this mode, RF control is not allowed and the RF attenuator is fixed for a minimum output level of -127 dBm.
  • Page 29 OFF, CODE, and TONE. A selection of OFF, the default setting, commands the NAV 2000R to force the percent of modulation to 0%. A selection of CODE, causes the NAV 2000R to Morse code modulate using the specified identification string. A selection of TONE, commands the NAV 2000R to modulate a steady tone.

  • Page 30: Vor Audio Control Mode (Vora) Field Definition

    The VOR audio control mode, VORa, is entered by pressing and releasing the SEL key while the AUDIO control mode field, on VOR page 1, is selected. This mode allows the user to specify the NAV 2000R audio output signal level using volts RMS. No RF level control is allowed while within this mode of operation.

  • Page 31: Rf Output Level

    Programs the %MOD of the 90 and 150 Hz tones. The valid entry range for this field is from .000 to .400 DDM (Difference in Depth of Modulation) with .001 resolution. The NAV 2000R computes the percent of modulation ratio between the 90 and 150 Hz required to produce the commanded DDM. The percent of modulation of each tone will be set to the proper ratio forcing both tones to total the standard modulation of 40%.
  • Page 32 Programs the 1020 Hz tone modulation percentage. This is a numeric field type and is programmable from 0 to 99% in 0.01% steps. An entry of 0% modulation commands the NAV 2000R not to modulate the ident tone. The VAL flag will be set when any value, other than the default value of 20%, is entered.

  • Page 33: Loc Audio Control Mode (Loca) Field Definition

    OFF, CODE, and TONE. A selection of OFF, the default setting, commands the unit to force the percent of modulation to 0%. Selecting CODE, causes the unit to Morse code modulate the specified identification string. And a selection of TONE, commands the NAV 2000R to modulate a 1020 Hz tone.

  • Page 34: Glideslope Mode Field Definitions

    Programs the modulation percentage of the 90 and 150 Hz tones. The valid entry range for this field is from .000 to .400 DDM (Difference in Depth of Modulation) in .001 steps. The NAV 2000R computes the percent of modulation ratio between the 90 and 150 Hz tones required to produce the commanded DDM.
  • Page 35 Programs the modulation percentage of the 90 and 150 Hz tones. The valid range for this field is from .000 to .800 DDM in .001 steps. The NAV 2000R computes the percent of modulation ratio between the 90 and 150 Hz tones required to produce the commanded DDM. The modulation percentage of each tone will be set to the proper ratio and with both tones totaling the standard modulation of 80%.

  • Page 36: Adf Mode Field Definitions

    This field allows the RF frequency to be programmed. The RF frequency may be programmed in 0.00001 Mhz steps within the NAV 2000R frequency range of 0.15000 mhz to 450.00000 mhz. NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 3-16...
  • Page 37 OFF, CODE AND TONE. A selection of OFF, the default setting, commands the NAV 2000R to force the percent of modulation to 0%. A selection of CODE, causes the NAV 2000R to generate the specified Morse Code identification string using audio ON/OFF keying. A selection of TONE, commands the NAV 2000R to modulate a steady tone.

  • Page 38: Marker Beacon Mode Field Definition

    This field programs Marker Beacon modulation percentage. Only one Marker Beacon frequency is modulated at a time. This is a numeric field type and is programmable from 0 to 99.0% in 0.01% steps. NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 3-18...

  • Page 39: Communication Mode Field Definition

    This toggle menu selects the Marker Beacon modulation technique: OFF, TONE, CODE. When the default option of CODE is selected, the NAV 2000R will pulse the modulation on and off at a rate as defined by the Beacon selected. If TONE is selected, the NAV 2000R will modulate a constant marker beacon tone.

  • Page 40: Selcal Mode

    SELECT Selecting the SELECT mode field places the NAV 2000R into the SELCAL mode of operation. The SELCAL mode menus are described in Section 3.5.13. 3.5.13 SELCAL MODE The SELCAL mode allows the NAV 2000R to output the signals necessary to test SELECTIVE CALLING.
  • Page 41 This field programs the modulation percentage of the COM test tone. This is a numeric entry field type and is programmable from 0 to 99% in 0.01% steps. The default for this field is 30%. NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 3-21...

  • Page 42: Utility Menu

    This option permits the user to display and modify the current NAV 2000R GPIB address. The address field specifies the desired GPIB address of the NAV 2000R for talk and listen. This is the address the NAV 2000R responds to during a host computer call for talk or listen bus transactions. This field is a numeric data type and has a valid range from 0 to 31.
  • Page 43 " on the status line. CALIBRATION MODE The calibration mode places the NAV 2000R into a mode that guides the test/calibration user through the calibration and alignment steps of the NAV 2000R. The calibration mode is covered in detail in Section 3.5.16.

  • Page 44: External Modulation Mode

    1 volt peak. 3.5.16 CALIBRATION MODE The calibration mode of operation will aid the user in the calibration and alignment of the NAV 2000R unit. To calibrate the NAV 2000R, follow the instructions found on these pages. Additionally, the user should refer to the calibration procedure contained within this manual.

  • Page 45: Display Definition During Power On Sequence

    3.5.18 STORING & RECALLING SETUPS The NAV 2000R has the ability to store and recall up to 49 different NAV 2000R conditions. All NAV 2000R selection options are stored to memory for later recall. The store function saves current NAV 2000R status, configuration setup, system mode of operation, field data, and the current page and field selector positions.

  • Page 46: Gpib Remote Interface Description

    NAV 2000R will truncate extra characters. A maximum of 511 bytes of characters can be returned by the NAV 2000R at once. At present, all GPIB commands return only a few bytes of information. Therefore, 32 bytes are sufficient.

  • Page 47: Command List

    Aeroflex Operation Manual 3.6.2 COMMAND LIST This Section contains the NAV 2000R command list. Each command is described using the following method: 1> Values to/from the NAV 2000R are denoted with the following letters: D Decimal characters; 0 - 9 H Hexadecimal digits;...
  • Page 48 MODE= AAAAA FORMAT: The MODE= command sets the NAV 2000R mode of operation. It is equivalent to pressing the front panel mode select keys. The ASCII argument specified will determine the mode to be set. The valid modes of operation selectable remotely are: VOR, VORa, LOC, LOCa, G/S, MKR, COM [M], and EMM.
  • Page 49 The power units are specified following the data field. If a measure unit, either dBm, uV, or mV, is not specified, the NAV 2000R will default the data to be in dBm units. Range limits are checked to insure the user does not select a power level out of range for the selected mode of operation.
  • Page 50 This command may be used to set the repetition rate at which the Morse Code identifier is transmitted. Rate may be programmed from 1.0 to 65.0 s. with 0.1 s. resolution. NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 3-30...
  • Page 51 This command sets the marker beacon frequency to a specific value. This command must follow a marker beacon mode set command since marker beacon frequency is automatically set to be the default when the beacon mode changes. NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 3-31...
  • Page 52 VOR modes of operation. During the VORa audio control mode, an ASCII string of "ON" or "OFF" must be specified. With normal VOR mode, a numeric value may be specified with 0.01 % resolution. NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 3-32...
  • Page 53 EXT MOD= AAA FORMAT: This command either switches "ON" the external modulation input to be summed with internally generated audio, or switches the external modulation input "OFF". NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 3-33...
  • Page 54 Selective Calling pulses is stopped, however the RF carrier remains on. NOTE: If the NAV 2000R's RF carrier has not been turned on prior to sending this command, no action is performed. The RF carrier can be turned on in two ways: by sending the SCL RF KEY= ON command, or by using the SELCAL menus while the NAV 2000R is in Local mode.
  • Page 55 This command programs the pulse width of PULSE #2 in the Selective Calling mode of operation. The range is from 0 to 2.000 S in .001 S steps. NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 3-35...

  • Page 56: Using The External Audio Input

    3.8 USING AUDIO OUTPUT The composite audio signal is accessible at the rear of the NAV 2000R. This signal is capable of driving a 600 Ω load and is calibrated to provide a fixed 2 V peak signal. Only during the audio control modes, VORa and LOCa, the output varies, from 0 to 1 V rms, according to the value set within the audio level field.

  • Page 57: Theory Of Operation

    The NAV 2000R Theory of Operation is contained in this Section. The General Description section describes the function of the various parts of the hardware. The Functional Description discusses the output parameters of the NAV 2000R. The Software section covers the software with respect to how it affects the hardware.

  • Page 58: Chassis Interior Layout

    DSP board and amplitude modulate the RF input signal. The conditions of the modulating audio composite signal is controlled by the system computer. NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 4-2...

  • Page 59: Com Signal Generator

    RF carrier. 4.3.6 SYSTEM COMPUTER BOARD THEORY OF OPERATION The system computer board controls the operation of the NAV 2000R. It consists of a microprocessor, a boot ROM, four memories, a GPIB interface, a video generator, a keyboard interface, buss control circuitry, discrete hardware control, and a slave controller.

  • Page 60: Dsp Board Theory Of Operation

    4.3.7 DSP BOARD THEORY OF OPERATION The digital signal processor board of the NAV 2000R is designed around Analog Device's digital signal processor, ADSP 2105. The board generates various fixed level complex waveforms. The digital signal processor uses a sine lookup table ROM to obtain values for sine and cosine functions (reference DSP Board Block diagram, JPN Drawing 40-5743-00, located in Section V of this manual).
  • Page 61 = Instantaneous phase of the ident tone. df = Peak frequency deviation = +/- 480 Hz f m = Frequency modulation = 30 Hz NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 4-5...

  • Page 62: Rf Modulator Module Description

    .1 dB step. The boards are interfaced to the NAV 2000R system computer via the audio board which controls the RF board and step attenuator. An in depth treatment of the modulation process is provided in the following sections.

  • Page 63: Audio Board Operation

    The audio signal input to the audio board can either be generated by the NAV 2000R DSP board or applied via an external input. The external input may be switched on or off. It is AC coupled into the modulator audio circuitry.
  • Page 64 The required attenuation values used to achieve from 0% to 100% modulation are stored in the NAV 2000R system computer. Therefore, to achieve 50% modulation, the modulating signal applied to the audio board will have its amplitude reduced by a factor of one half. Note that percent modulation is...

  • Page 65: Rf Modulator Board Operation

    0 dBm to -127 dBm in 1/10th dB steps. The drivers for each of the step attenuators, along with the 1/10th dBm control circuit, are found on the audio board. NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 4-9...

  • Page 66: Synthesizer

    The 10 MHz is used by the microprocessor and direct digital frequency synthesizer as basic operating clocks. The microprocessor interfaces with the NAV 2000R system buss and generates the control signals required to program and monitor frequency generation. The Direct Digital Frequency Synthesizer clocks into the Digital to Analog Converter values at a 10 MHz rate that produces a sine wave of 700 kHz plus or minus 1.2 kHz with millihertz of resolution.

  • Page 67: Nav 2000R Software

    The Reverse Power Protection (RPP) module provides a mean for interruption of the RF path between the unit under test (UTT) and NAV 2000R output. Should a high RF signal be fed to the NAV 2000R output connector, while testing a transceiver for instance, an internal switch in series with the RF output will open.

  • Page 68: Self Test

    4.4.1 SELF TEST The NAV 2000R performs a self test during power up. This self test includes the following checks and measurements. The CPU board reads, calculates, and compares the calculated checksum with the stored checksum within EPROM, EEPROM (UV BOOT and DYNAMIC ROM), and Battery RAM.

  • Page 69: Calibration

    1) Re-initialize the registers to update data integrity: In the event the battery RAM is replaced with a new part, the power up self test of the NAV 2000R will fail the CPU RAM register memory test. This tells the user that one of the set-up registers contains bad data.

  • Page 70: Detailed Circuit Description

    3) Re-configure the NAV 2000R to the user's preference: The user can now set the NAV 2000R to their desired configuration. This could be to set the GPIB address, and External Modulation settings. 4) Re-calibrate the unit to insure good calibration constants: Since the unit's calibration constants are contained within the battery RAM module, the unit must be re- calibrated to insure the unit is producing the desired signals.

  • Page 71: Dsp Board Circuit Description

    U28. A low at pin 34 of U28 starts a timer within U28. If a key is held for longer then the programmed times additional interrupts will occur. Processor U1 determines and drives the NAV 2000R display. Timers within U1 generate the horizontal sync and vertical sync for the display. The values and fields displayed are generated by software within the processor and written to video rams U33 and U34.

  • Page 72: Rf Modulator Module Circuit Description

    4.5.6 RF MODULATOR MODULE BUS INTERFACE CIRCUITRY (AUDIO BD-A1) The RF Modulator Module interfaces to the NAV 2000R via system bus connector, J1. RN1 and RN2 provide pull ups to the system data bus, address bus, and control lines. The bus request is the system bus request 1.

  • Page 73: External Audio Control

    The bus grant is open collector as it is for all modules in the NAV 2000R.

  • Page 74: Audio High/Low Indication

    DAC to achieve the various attenuation’s which produce the various % modulations. The DAC audio output is buffered by part of op amp U9 and applied to the percent modulation centering and calibration circuit. NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 4-18...

  • Page 75: Modulation Centering & Calibration

    The Voltage Reference U15 provides a stable +5.0 V DC voltage which is used to calibrate and stabilize the NAV 2000R modulation performance. It is used by the Detected Audio Hi/Lo Indication, Audio High/Low Indication, RF Level High/Low Indication, RF level set, % Modulation Centering & Calibration, and Detector Bias networks.

  • Page 76: Programmable Step Attenuator Control

    RT1(T) is a function of temperature. If the VGA gain is a function of temperature and input control voltage and is written, Gvga(T,Vagc) then, it follows that the resultant gain be temperature independent if adequate compensation is achieved, Gcomp(Vagc) = Gvga(T,Vagc)*G(T) . NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 4-20...

  • Page 77: Audio Modulated Amplifier

    VGA with a DC bias of 0.25 volts on its Vagc input (U1 pin 8) is about -22 dBm. The 14 dB balanced pad attenuates the signals delivered to each of the inputs of the RF leveling VGA to -36 dBm. NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 4-21...

  • Page 78: Fixed Gain Amplifiers

    -3 dB insertion loss so that there will be a 0.0 dBm carrier level at the output of the NAV 2000R - if no other attenuation is inserted by the programmable attenuator.

  • Page 79: Lpf & Integrator

    80 mV, "RF level too high" is indicated. Conversely, if the leveling loop gain control voltage attempts to raise the RF output by developing a voltage greater than 1.05 V, "RF level too low" is indicated. Both error indications are +5 VDC. NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 4-23...

  • Page 80: Programmable Step Attenuator

    The synthesizer generates a CW frequency at a -20 dBm level in 10 Hz steps from 150 kHz to 450 MHz. To set the synthesizer frequency, the NAV 2000R CPU board first checks the new frequency flag (RAM location 5 of REF/CONTROL board within the synthesizer) to verify that the last frequency loaded has been processed.

  • Page 81: Rf/Output Board Circuits

    Refer to the JPN schematic 02-5868-00 during the following discussion. The RF/OUTPUT board consists of a MAIN PLL, RF frequency dividers, harmonic suppression filters, a 400 MHz PLL, a Mixer and filter, and output leveling. NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 4-25...

  • Page 82: Main Vco

    With sequential programming of the A and N counters, this produces frequency steps of 50 kHz at the RF frequency. As noted earlier, the NAV 2000R synthesizer has step size of 10 Hz. To produce this smaller frequency step, the 10.7 MHz reference input is shifted up or down in frequency to produce the proper RF frequency.

  • Page 83: Main Vco

    VCO runs only during low band operation (150 kHz - 56.25 MHz). It is always operated at 400 MHz. Its tuning voltage should be approximately 5 VDC. NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 4-27...

  • Page 84: Reverse Power Protection (-50 Unit With Mod Status 7)

    OFF position, relay K101 is in its normally open state. This prevents any damage to the instrument while it is not in use. On power-up, a reset command is issued by the NAV 2000R CPU board to flip-flop U2. U2’s output turns on Q1 and Q2 providing drive to relay K101’s control pin thereby closing the path between the NAV 2000R output stage and the unit under test.

  • Page 85: Maintenance Information

    MAINTENANCE INFORMATION BILLS OF MATERIALS, ASSEMBLY DRAWINGS, AND SCHEMATICS To assist in the maintenance of the NAV 2000R Signal Generator, Bills of Materials, Assembly Drawings, Schematics, and Test Procedures are included in the NAV2000R Maintenance Manual (PN 06-0520-50 for hard copy, E6-0520-50 for CD) available separately from Aeroflex.

  • Page 86: Gpib Command Quick Reference

    1.00 mV to 224 mV (to nearest .1 dBm) Default: -127.0 dBm BEARING Command: BEARING= Values: 0.00 to 359.99 degrees (0.01 degree steps) Default: 0.00 degrees NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG A-1...
  • Page 87 IDENTIFICATION MODE Command: IDENT MODE= Values: OFF, TONE, CODE Default: IDENTIFICATION CODE Command: IDENT CODE= Values: 6 characters of A thru Z, 0 thru 9 Default: JCAIR NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG A-2...
  • Page 88 TO, FROM Default: FROM 30 Hz PERCENT MODULATION Command: 30HZ %MOD= Values: ON, OFF Default: 9960 Hz PERCENT MODULATION Command: 9960HZ %MOD= Values: ON, OFF Default: NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG A-3...
  • Page 89 80.0 Hz to 100.0 Hz (0.1 Hz steps) Default: 90.0 Hz 150 Hz FREQUENCY Command: 150HZ= Values: 135.0 Hz to 165.0 Hz (0.1 Hz steps) Default: 150.0 Hz NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG A-4...
  • Page 90 150 mS to 750 mS (1 mS steps) Default: 450 mS WORD RATE Command: WORD RATE= Values: 1.0 to 65.0 seconds (.1 second steps) Default: 30.0 seconds NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG A-5...
  • Page 91 Command: 90HZ %MOD= Values: 0.00 to 99.00% (0.01% steps) Default: 40.00% 150 Hz PERCENT MODULATION Command: 150HZ %MOD= Values: 0.00 to 99.00% (0.01% steps) Default: 40.00% NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG A-6...
  • Page 92 ADF %MOD= Values: 0.00% T0 99.00% (0.01% steps) Default: 95.00% MODULATION FREQUENCY Command: ADF FREQ= Values: 10.0 Hz to 18000.0 Hz (0.1 Hz steps) Default: 1000.0 Hz NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG A-7...
  • Page 93 TONE #2 PERCENT MODULATION Command: COM %MOD2= Values: 0 to 99.00% (0.01% steps) Default: 00.00% TOTAL PERCENT MODULATION Command: TOTAL %MOD= Values: 0 to 99.00% (0.01% steps) Default: 30.00% NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG A-8...
  • Page 94 SCL 2 CODE= Values: AA - SS Default: PULSE #1 TONE #1 FREQUENCY Command: SCL 1 TONE 1= Values: 100 to 9999.9 Hz (0.1 Hz steps) NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG A-9...
  • Page 95 10 Hz to 18000.0 Hz (.1 Hz steps) Default: 1000.0 Hz TEST TONE PERCENT MODULATION Command: SCL %MOD= Values: 0 to 99.00% (0.01% steps) Default: 00.00% NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG A-10...

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