External Modulation Mode; Calibration Mode - Aeroflex NAV 2000R Operation Manual

Under the GENERAL heading are; MODE: indicates current selected mode, OPERATION: LOCAL or
REMOTE operation is selected, GPIB ADDRESS: selected GPIB address, MODULATE: indicates
whether EXTERNAL audio ,INTERNAL audio, or both is applied to the NAV 2000R modulator, ON TIME:
indicates total time that the NAV 2000R has been powered on, in hours since manufacture, CYCLES:
indicates the number of times that the NAV 2000R has been switched on.
Under the CPU heading are; VERSION: indicates software version number of the CPU board, ROM:
indicates results of the UV BOOT ROM and DYNAMIC EPROM self tests, RAM: indicates results of the
STATIC RAM and Battery RAM self tests.
Under the DSP headings are; VERSION: indicates software version number of DSP software, BUS
RESPONSE?: indicates proper operation of DSP board bus interface, PROGRAM BOOT?: indicates
results of the self test of DSP boot RAM, SINE ROM OK?: indicates results of the self test of DSP ROMS.
Under the RF SOURCE heading are; VERSION: indicates software version number of the internal RF
generator software, BUS RESPONSE?: indicates proper operation of FREQ GEN bus interface, RF
LEVEL: indicates whether RF LEVELING circuits are within limits, RF FREQUENCY: indicates frequency
control loops operation.
Under the MODULATOR heading are; BUS RESPONSE?: indicates proper operation of MODULATOR
bus interface, AUDIO LEVEL: indicates the current level of audio at the modulator input, DETECT
AUDIO: indicates detected audio check during self-test passed or failed, RF LEVEL: indicates RF output
level is being controlled.
EXECUTE DISPLAY TEST
This option allows a visual test of the display. The test turns on all of the display's pixels. A message,
"PRESS KEY TO STOP", is moved around in the display in random places. Observe the display to
determine if all of the pixels turn off and on properly. Then press any key to terminate the display test.
SET ALL REGISTERS TO DEFAULT
Sets all saved registers information and current field data selections to default factory settings.

3.5.15 EXTERNAL MODULATION MODE

External Modulation Mode (EMM) allows an external modulating signal to modulate the RF input. It is
accessed through the Utility Menu by depressing a Mode control key for two seconds and then choosing
option 2 from the Utility Menu. The External Modulation is AC coupled and is applied to the EXT MOD IN
port on the rear panel of the RF Modulator Module. The EMM menu shows external audio level high, low,
or O.K. depending upon whether or not the peak of the audio signal is set appropriately. The level of an
audio signal applied to the external modulation input is nominally 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. This procedure furnishes more detailed
test equipment setup instructions and should be used as the primary procedure. The pages displayed
within the CALIBRATION mode are useful as aids and when selected, automatically sets NAV 2000R
inputs and outputs to the required state for the alignment being made. Upon completion of each page of
instruction press the "ENT" key. If an adjustment is to be skipped, pressing the 120 degree Bearing hot
key will select the next page and therefore, setup conditions for that step of alignment.
NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 3-24
Aeroflex Operation Manual