7
AP Series
Instruction Manual
EAS/ALT IF
AUTOMATIC
- Connect a jumper to the terminal strip auto position. EAS/ALT will switch on when a
+37 dBmV EAS IF signal is detected.
MANUAL
- EAS is active with a ground connection on the manual position of the terminal strip
(Do not insert jumper when manually switching.)
Automatic
Manual
Adjustments
OUTPUT LEVEL
Connect a suitable RF indicator such as a Field Strength Meter (tuned to the visual carrier frequency) or a Spectrum
Analyzer to the RF output of the modulator or a system monitor point and adjust the Output Level control to the desired
reading of the visual carrier.
A/V CARRIER RATIO
To adjust the aural-to-visual carrier ratio, tune the RF indicator device to the aural carrier frequency and adjust the Aural
Level control to obtain the desired aural carrier level. Note that you cannot obtain a ratio smaller (that is, the aural level
relatively higher) than that of the incoming RF signal. Recommended ratio is -15 dB.
STANDBY CARRIER THRESHOLD
The Standby Carrier Threshold is factory-set for -19 dBmV. If it is necessary to set the threshold to some other level, pro-
ceed as follows before installing the AP Processor in its rack or cabinet.
1. Plug the AP Processor power cord into a 117 VAC, 60 Hz outlet. The green Power LED on the front panel will light. A
warmup period of about 30 minutes is required to stabilize the equipment.
2. Set the AP Processor to the desired input and output channels.
3. Connect a television receiver (tuned to the output channel) to the rear-panel RF OUT terminal;use the RF OUT con
-
trol and attenuators as required to avoid overloading the receiver.
4. Using a variable attenuator and a signal level meter, adjust the input signal to the desired threshold level.
Connect the input signal to the RF INPUT terminal.
5. Locate the Threshold Control, R32.
6. Adjust R32 so that the picture just switches between the input signal and the standby carrier.
Use the television receiver as an indicator.
7. After making the adjustment, disconnect the power cord and input and output cabling.
8. Install the unit in its mounting location.
