Standard Communications TVM Series Owner's Manual page 20

Controls and Connections
Front Panel for TVM450S/TVM550S/TVM550II Models with
CSG60 Audio Module
Refer to Figure 3-1 for the following description:
29. LEFT CHANNEL – Seven-segment LED bar display. Indicates the peak
audio deviation in percent. When the sixth bar is lit, a representation of the
rear panel left input (38), when combined with the right channel input (37),
produces 100 percent or
25 kHz peak aural deviation. The seventh bar indicates overdeviation and
should light only occasionally. The bar display is precalibrated with an inter-
nal 15 kHz low-pass filter for accurate monaural or BTSC (L + R) indication.
30. INPUT LEVEL (L) – Potentiometer. For adjusting the left channel audio in-
put level. The center detent position is calibrated for 25 kHz peak deviation
of the aural output, with 0 dBm peak program audio level. Rotating the po-
tentiometer varies input levels.
31. MONO INPUT LEVEL – Potentiometer. For adjusting the mono channel
audio input level. The center detent position is calibrated for 25 kHz peak
deviation of the aural output, with 0 dBm program audio input level. Rotating
the potentiometer varies input levels.
32. STEREO INPUT – Red LED. Lights when a BTSC stereo signal is present.
33. VIDEO LOCK – Green LED. Lights when the BTSC signal is synchronized
with the internal horizontal sync frequency.
34. RIGHT CHANNEL – Seven-segment LED bar display. A representation of
the right channel audio input level. When the sixth bar is lit, a 25 kHz peak
deviation output level has been achieved, indicating a 0 dBm input level. The
seventh bar indicates overdeviation when lit.
35. 4.5 MHz OUTPUT LEVEL – Potentiometer. Adjusts the 4.5 MHz output
level.
36. INPUT LEVEL (R) – Potentiometer. Adjusts the right channel audio input
level. This adjustment is made when a BTSC stereo format is selected. In
the center detent position, the input level is preset for 0 dBm.
Rear Panel for TVM450S/TVM550S Models with CSG60
Audio Module
Refer to Figure 3-1 for the following description:
37. R (+) and R (–) – Screw terminals. A 600-ohm balanced, right-channel
audio input for the BTSC stereo generator.
38. L (+) and L (–) – Screw terminals. A 600-ohm balanced left-channel audio
input for the BTSC stereo generator.
39. MONO (+) and (–) – Screw terminals. A 600-ohm balanced monaural audio
input for the BTSC generator. This is used for commercial insertion.
40. GND – Screw terminal. An external ground connection for the modulator.
Page 3-4 Owner's Manual TVM450/S/TVM550/S/TVM550II/TVM550IIS