27
ADJUSTMENT WITHOUT MODULATION MONITOR –
NOTE
NOTE
WITHOUT A MODULATION MONITOR, THE FOLLOWING AD-
JUSTMENT WILL NOT ENSURE A 100% MODULATION LEVEL
FROM THE TRANSMITTER.
1. Operate the front–panel breaker to ON.
2. Depress the front–panel ON switch/indicator to illuminate the switch/indicator.
3. Operate the audio source with normal program music.
4. Ensure pilot indicator DS1 is illuminated. If the indicator is not illuminated, the composite
signal is not present at the transmitter.
5. Adjust the composite source output level control until the front–panel COMPRESSION indicator blinks at a
rate of approximately once per second. This will provide a modulation level of less than 100%. However,
the audio input will be adjusted to a level preventing audio input overload and clipping. Ensure the level does
not exceed 3.5 volts peak–to–peak.
SCA.
The SCA input audio level is adjusted by using the output level control on the audio source. To adjust the level to
obtain the desired modulation, proceed as follows:
1. Connect an SCA decoder to the modulation monitor.
2. Operate the front–panel breaker to ON.
3. Depress the front–panel ON switch/indicator to illuminate the switch/indicator.
4. Operate the audio source to output a 400 Hz tone.
5. Adjust the audio source output level for approximately 15% modulation on the SCA decoder. Indicator D8
on the DSP circuit board illuminates to indicate the overload of the SCA input. If D8 illuminates decrease
the audio level until D8 extinguishes.
MOUNTING.
The PNP 1000 transmitter requires 21 inches (53.3 cm) of a 19 inch (48.3 cm) rack cabinet. Do not mount the trans-
mitter directly above or below heat generating equipment. Once a rack location is determined, mount the chassis in
the rack using 4 screws.
Summary of Contents for PNP 1000
Page 1: ...PLUG N PLAY 1000 1000 WATT DIGITAL FM TRANSMITTER April 2002 IM No 597 9972 ...
Page 12: ...47 PNP 1000 SCHEMATICS ...
Page 13: ......
Page 14: ......
Page 15: ......
Page 16: ......
Page 17: ......
Page 18: ......
Page 19: ......
Page 20: ......
Page 21: ......
Page 22: ......
Page 23: ......
Page 24: ......
Page 25: ......
Page 26: ......
Page 27: ......
Page 28: ......
Page 29: ......
Page 30: ......
Page 31: ......
Page 32: ......
Page 33: ......
Page 34: ......
Page 35: ......
Page 36: ......
Page 37: ......
Page 38: ......
Page 39: ......
Page 40: ......
Page 41: ......
Page 42: ......
Page 43: ......
Page 44: ......
Page 45: ......
Page 46: ......
Page 47: ......
Page 48: ......
Page 49: ......
Page 50: ......
Page 51: ......
Page 52: ......
