Cma60 Front And Rear Panels - Standard Communications TVM Series Owner's Manual

Audio Adjustment
The TVM450, TVM550 and TVM550II modulators use the CMA60 Monaural
Audio module. The controls and connections unique to this module are shown in
Figure 4-2.
DEVIATION INDICATOR
Figure 4-2. CMA60 Front and Rear Panels
Inputs to this module are Video, External 4.5 MHz Aural Carrier, and Monaural
Audio. Switches available on this module are AUDIO (MONO or BTSC) and
4.5 MHz (internal or external).
1. To select the Monaural Audio Input, slide the AUDIO switch to the MONO
position and apply a 0 dBm input to the IN (+) and IN (–) terminal screws on
the rear of the CMA60 Monaural Audio Module. The BTSC INPUT LED
lights when the AUDIO slide switch is moved to the BTSC position. Other-
wise, this LED remains unlit.
2. The position of the 4.5 MHz switch is in either the INT (internal) or EXT (ex-
ternal) position, depending on where the 4.5 MHz aural carrier is to originate.
The signal applied to the EXT 4.5 MHz IN jack should be between +35 and
+60 dBmV.
3. Apply a 1.0 V peak-to-peak (p-p) video signal to the VIDEO IN jack.
4. Observe the AUDIO DEVIATION LED bar display. Adjust the AUDIO
DEVIATION potentiometer through the PEAK marking on the face of the
monaural module, so all the LEDs, except the PEAK, light. For BTSC audio
input, adjust the meter for the same indication as Monaural Audio.
TVM450/S/TVM550/S/TVM550II/TVM550IIS
PEAK
MONO AUDIO
AUDIO
AUDIO
−
MONO BTSC
+
MONO GND
Owner's Manual
Installation and Operation
BTSC
INPUT
CMA60
MODULE AUDIO
DEVIATION
4.5 MHz
INT EXT EXT. 4.5 MHz
VIDEO
IN
IN
9037
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