COMTEK BST-50b - Manual (Page 6)

Page 5
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. While normal program information is present, slowly
rotate the “LEVEL” control on the back of the base station
clockwise until the VU meter on the front panel begins to
deflect. Only very loud speech or music should deflect the
VU meter full scale.
Audio Processing and Frequency Selection
To accommodate a wide variety of receivers, the BST-50b base
station transmitter has the ability to operate both companded
and non-companded. (Refer to page 11 for listing of receivers
to determine whether you need to operate companded or
non-companded.) The display on the front panel will indicate
non-companded channels (1:1 audio processing) or
companded channels (2:1 audio processing). The up/down
button allows you to scroll through two sets of letter channels
(A-J 1:1 and A-J 2:1). All narrow-band number channels are
companded (2:1 modulation).
IMPOR
TANT