Tektronix TG8000 Service Manual

GPS7 module troubleshooting
DC antenna o utput power
voltage
The GPS7 module
is capable of providing power to a G PS antenna. Use this
procedure to v erify that the GPS7 module is providing power correctly.
1. Disconnect th
e antenna from the GPS7 module.
2. Connect the voltmeter to the GPS7 Antenna input, using a coaxial cable, BNC
T connector, and a B NC to Banana plug adapter. Do not connect a terminator
at this time. The Antenna Power light should be blinking green.
3. Make note of the voltmeter reading, for later use.
4. Set the antenna voltage to 3.3 V.
5. Check the voltmeter reading. It should be between 3.1 V and 4.0 V.
6. Set the an
tenna voltage to 5 V.
7. Check the voltmeter reading. It should be between 5 V and 6 V.
8. Connect a 75 Ω precision terminator to the BNC T connector, to simulate a
typical load. The Antenna Power light should change from blinking green to
solid g
reen.
9. Check the voltmeter reading. It should be between 4 V and 5 V.
10. If the GPS7 module does not provide the corre ct voltages, replace the
GPS7 module.
11. Disconnect the cable from the GPS7 Antenna connector.
12. Reset the GPS7 module to the voltage noted in step 3, or to the correct voltage
for the antenna in use.
13. Reconnect the antenna.
Swap modules and
mainframes
If you have other TG8000 modules or mainframes available, they can be used to
help isolate problems.
Swap the GPS7 module into slot 1 of another TG8000 mainframe. If
the GPS7 module works in that mainframe the problem is in the original
mainframe.
Swap a second GPS7 module into slot 1 of the test m ainframe. If this module
works in the test mainframe the problem is the original GPS7 module.
Put a module of a different type into slot 1 o f the test mainframe. An
AGL7 module is a good one to use, as it uses most of the same signals as a
GPS7 module. If that m odule works in the test mainframe then suspect the
original GPS7 module, but the problem could still be in the mainframe.
10–18 TG8000 Multiformat Test Signal Generator Service Manual

Tektronix TG8000 Specifications

General

Brand	Tektronix
Model	TG8000
Category	Portable Generator
Language	English