GPS7 module troubleshooting
Oven oscillator frequency
adjustment
The oven oscill
ator frequency adjustment saves the current tune voltage for
the oven. This will be used when the instrument is in “internal” mode. If the
instrument is locked to a GPS signal, this should be done periodically to account
for crystal drift. This adjustment can be done without any d isruption to operation,
and is best done in the instrument's operating environment. This adjustment can
be done without putting the instrument into Factory Mode, so the instrument
does not hav
e to be taken out of service.
To adjust the oven oscillator frequency, perform the adjustment procedure. (See
page 2-5, To
adjust the master clock using an installed GPS7 module.)
Acquire new position
The GPS7 module must have a valid 3D GPS position to properly lock to GPS
time. If the GPS antenna is moved, a new position must be acquired for correct
time inf
ormation. There must be a good antenna feed, and the GPS receiver must
be locked to at least four GPS satellites for this procedure to complete successfully.
The unit will require approximately 60 seconds to acquire a new position.
1. Navigate to GPS7:GPS SETUP:ACQUIRE POSITION, and then press the
ENTER button.
2. Select GPS7:STATUS.
3. Wait u
ntil the status display shows Locked.
4. This process requires four satellites to complete successfully. If the signal is
marg
inal the acquisition may take longer. If the signal is poor, or if there is no
signal, the acquisition will not finish.
TG8000 Multiformat Test Signal Generator Service Manual 10–17
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