COMTEK BST-25 - Manual (Page 6)

Page 5
Audio Adjustments
In order to ensure the highest possible transmission fidelity,
the transmitter must be modulating at least 50% with normal
speech (-3 dB on the VU meter). This adjustment is made in
the following manner:
a. Ensure that the audio source has been optimized for
best signal-to-noise ratio.
b. The “MIC/LINE” switch located at the back of the
transmitter should be switched to the appropriate setting:
"MIC" for mic level or weak line level input; “LINE” level for
line level input.
c. The “LEVEL” control on the back of the base station
should be set fully counterclockwise and then, while normal
program information is present, slowly rotate the “LEVEL”
control clockwise until the VU meter on the front panel
begins to deflect. Adjustment should be made so that normal
speech or music deflects the meter mid-scale. Only very loud
speech or music should deflect the VU meter full-scale.
Frequency Selection
The BST-25 base station transmitter
has the ability to operate on one of 119 preset channels
between 76.200 MHz and 87.800 MHz (TV channel 5 and TV
channel 6). Channels are designated by both frequency and
channel number. Channels which operate in the TV 5
spectrum are prefixed with a 5 (5-50 is 81.100 MHz),
channels operating in the TV 6 spectrum are prefixed with
a 6 (6-50 is 87.100 MHz). This channel rastering makes it easy
to determine which TV band you are operating on.
IMPORT
ANT