Retrofit Instruction
connection from the output of the translator to the load and verify the load is
good.
40. Decrease the aural power as low as possible using the equipment that is
supplying the 45 MHz IF signal.
41. Do the following steps to ensure that the power meter is properly
calibrated. Using a spectrum analyzer and the external wattmeter and, apply a
black picture with “0 IRE setup”, adjust the power control such that the
wattmeter reads the desired peak sync power times 0.6, and then follow the
procedure in the UST-106A instruction manual to adjust the power meter to
read 100% . Increase aural power until the desired visual to aural ratio is
achieved. Observe the -4.5 and +9 MHz intermodulation products. These
signals should be -50 dBc or lower.
42. Set the Meter Selector on the top Meter Panel to Aural. Follow the
procedure in the UST-106A instruction manual to adjust the aural power
meter to read the desired power.
After completing the procedure outlined above, the transmitter is ready to go
on line. Turn off the transmitter and remove the dummy load and wattmeter.
Connect the antenna to the output connector and adjust the power control for
100% on the multimeter (when the meter selector is in the forward position)
and check the reflected power. The reflected power should be about the same
as that recorded before the modification.