4.
Locate the 50W Power Amp Circuit Board; access is possible through the protective cage.
J5
J2
R83
Figure 22-7. Location of 50W Power Amplifier Circuit Board
5.
Remove connector J5. This connector
MUST
be removed before proceeding with the
connection of a dummy load at J2.
6.
Remove connector J2. and install a 50 ohm dummy load; reinstall J5.
7.
Adjust R83 for 15.8Vrms (+37dBm) while transmitting 5 watts using frequency selective volt
meter. (FSVM) 50Vrms when transmitting 50 watts.
WARNING: R83 will tune clockwise to
lower gain and counter clockwise to increase gain.
8.
For 100 watt systems repeat steps 5, 6 and 7 for the other 50 watt amp.
9.
Again remove connector J5
, then remove the dummy load and reinstall the connector at J2.
10.
Reinstall the connector at J5.
11.
The TX Filter was configured at the factory. Use the 9508 filter calculation macro provided
with this equipment. Tune in accordance with the steps shown in section 10.6.2.1 of the 9780
Instruction Manual.
12.
Remove connector J5 from the Power Amplifier Circuit Board.
13.
Disconnect the line coupling from the 2W I/O connector on the rear of the 9508 RF chassis and
connect a 50 ohm dummy load.
14.
Reinstall the connector at J5.
RFL 9785
RFL Electronics Inc
.
March 1, 2013
22-
6
(973) 334-3100