RELEASED: 10/2/2006
Page 50
COMMUNICATI0NS
HSD SERIES OPERATION AND MAINTENANCE
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Copyright © 2006 EMCEE Communications. All rights reserved.
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NOTE: In the following steps, the power levels stated are those expected at the
output of the transmitter. Therefore, when measuring these power levels,
be sure to take into account any attenuation factor provided by the
directional coupler and the attenuators used in your test set-up.
HSD Control Board P/N 50528000
5.6.1 Forward Power Calibration:
1. With the OPERATE/STANDBY switch to STANDBY, connect the test
equipment and termination circuit to the transmitter output. Set the transmitter
for the desired output channel frequency.
2. Connect the desired test signal to the input of the modulator. Be the
modulator's power is ON and verify that it provides 87.5% video modulation.
Place the transmitter’s POWER switch to ON, its OPERATE/STANDBY
switch to OPERATE, its HIGH/LOW switch to HIGH, and turn the Aural
Carrier control fully counterclockwise to disable the aural carrier on the
modulator.
3. To set the transmitter's high output power, adjust the POWER ADJUST
control for a (external) power meter reading of 100W (50dBmw) (25 watts
average). (Note that 100W peak visual with 0% APL and 87.5% video
modulation is equal to 59.6W average visual.)
R49
Forward Power
Calibration Control
R48
Reflected Power
Calibration Control
