User Manual

System Components
9. All adjustments are factory preset; no field adjustments are necessary.
Allow the PA to warm up for a period of 5 minutes before taking
measurements. Key the Exciter and check forward Power (factory
adjusted), reflected power (close to zero) at the wattmeter and also at
the Display meter. Also available at the display panel are: DC supply
voltage, Drive voltage and temperature. Rotate the knob on the
display panel to read their values. Check measured data against the
Test Data sheet provided; they should be within 5% of each other.
10. Check forward output power with the desired input power level. Check
results against the Test Data sheet provided. If RF Out power is more
or less than the required output, adjust exciter output.
11. In the Power Amplifier unit itself there are three cooling fans. One at
the rear of the unit, which stays ON as long as the DC power is applied
and the other two fans at the front of the unit turns ON when the Power
Amplifier is keyed and RF Input power is detected. These fans will turn
OFF at about 2 minutes and 20 seconds after the system is unkeyed.
12. Check spurious and harmonics taken from the sampled output of the
wattmeter on a Spectrum Analyzer. These should be at least 65dBc.
13. Un-key the Exciter.
14. Turn Power Off.
15. Remove the dummy load. Leave the Isolator/Circulator and the
wattmeter connected as before.
16. Connect the antenna to the Isolator/Circulator output through the
wattmeter. Before connecting the antenna to the RF Output, have the
antenna and RF cables thoroughly checked by a professional.
17. Apply Power to the system. Wait for the internal diagnostic test time
period to elapse.
18. Manually key the exciter as before. Check reflected power, it should
be no more than 0-3% of the forward power. For reflected power more
than 5% of the forward power, unkey the system and have the antenna
and RF cables checked. Systems running with high reflected power
will cause irreversible damage to RF transistors and/or the
Isolator/Circulator.
19. Check display meter readings as before.
20. Unkey the transmitter. Monitor the system operation with actual
paging data for a short period of time. Check spurious and harmonics
as before.
21. The Power Amplifier is now ready to be put in service.
Version 3 3-17 07/18/01