Copyright 2005 ISC Technologies
11. Connect the 50-ohm cable from the power amplifier’s output through the 250-watt F.S.
directional wattmeter to the 250-watt R.F. load.
12. Connect the exciter’s output from the 5-watt F.S. directional wattmeter to the power
amplifier’s input.
13. Switch ON the power supply and key the exciter momentarily. Check that the power
amplifier’s power output is about 250 watts.
14. If this is not the case, follow the power amplifier alignment and logic circuit alignment
procedures in Section 6 before continuing with this installation.
15. Key the exciter momentarily and note the reflected power between the exciter and the
power amplifier. If this is greater than 0.2 watt, contact ISC Technologies Customer Service
before continuing.
16. Switch OFF the power and disconnect the 5-watt F.S. directional wattmeter between
the exciter and power amplifier. Connect the exciter directly to the power amplifier.
17. Switch ON the power supply and key the exciter. Check that the power amplifier’s
output power is acceptable.
18. Switch OFF the power supply and disconnect the 250-watt R.F. load. Remove the front
panel of the power amplifier and connect the power amplifier’s output to the antenna
system through the 250-watt F.S. directional waif meter.
19. Switch ON the power supply and key the exciter momentarily. Note the reflected power
from the antenna system.
20. If the power amplifier shuts down, remove JR26 or JR27 (whichever is installed) on the
logic board and note the reflected power from the antenna system.
DANGER
If the reflected power is greater than 8% of the required output power, the power
amplifier should not be used in this application subject to a void warranty. Contact
ISC Technologies Customer Service.
21. If the reflected power is less than 8%, and the power amplifier shuts down with
JR26/JR27 installed, switch OFF the power supply and contact ISC Technologies
Customer Service.
22. Replace JR26 or JR27 if removed previously. (The power amplifier did not shut down,
and reflected power is less than 8%).
23. Disconnect the 250-watt F.S. directional wattmeter, and replace the front cover. The
power amplifier is ready for use.
