Power supply negative (–) to the outer conductor
Power supply positive (+) to the inner conductor
Adjustments
Note: Normal setup and operation does not require internal access. Refer all service
and internal adjustments to qualified service personnel. Specifically, the user may
not make adjustments to the transmitter module. See the “Troubleshooting” section
for additional information.
Use the same adjustment procedures for use with Clearcom, RTS, and 70-volt line
applications.
Audio Compression Adjustment*
The “Audio Compression" switch limits audio signal dynamic range as follows:
HARD ALC improves intelligibility by providing about 35 dB of automatic level control
with fixed gain at low input levels. SOFT ALC position provides soft, 2:1 logarithmic
gain compression—demphasizing louder audio while emphasizing low-level audio.
LINEAR does not alter the audio signal at all, and provides no dynamic range
adjustment.
Set the “LOW” and “HIGH” frequency compensation controls to the mid, or “0,”
position.
*The adjustment procedure for an intercom system or 70-volt line input is identical,
except the mic/line switch is not needed and is nonfunctional.
Note: Whenever a different dynamic-range setting is selected, it will be necessary to
readjust the variable audio level control to achieve the 0 VU reading on the front-
panel bargraph. If the VU meter consistently reads significantly lower than 0 VU,the
system will not be operating at the best possible signal-to-noise ratio.
Audio Level Setting
The RMT-10 accommodates audio levels between –40 dB to +20 dB, a 60 dB range.
If you know the approximate level of the input audio, set the mic/line as follows:
Program Audio Level
Mic/Line Switch Setting
–10 to +20 dBu
“LINE”
–40 to –10 dBu
“MIC”
Next, adjust the front-panel INPUT LEVEL ADJUST control until the front-panel VU-
meter bargraph just reaches the “0 VU” position on voice peaks.
If you don't know the approximate level of the audio input, set the MIC/LINE
switch to LINE. Apply the desired program audio signal to the audio input connector.
Observe the front-panel VU meter. Adjust the front-panel variable audio level control
until the VU-meter bargraph just reaches the “0 VU” position.
If the VU meter bargraph consistently reads well below 0 VU, set the MIC/LINE
switch to the MIC position and readjust the variable audio level control for 0 VU
reading. If the VU-meter bargraph cannot be adjusted up to the 0 VU level with the
MIC/LINE switch in the MIC position, increase the audio level at the source.
Transmitter
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