COMTEK BST-75 User Manual
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Page 4
Audio Input Connections
The BST 75-216 base station transmitter uses an XLR-3F connector with
a “Combo” phone jack. The XLR portion of the connector will accept
a true balanced or unbalanced line level signal up to +20 dBm. The
1/4” mono jack portion of the connector can be used for AUX level
audio or line level audio up to +5 dBm. It also can be used to directly
phantom-power most two-conductor electret headset microphones.
Note:
For best performance,
the 1/4” mono jack should be
considered the primary choice
for shorter audio line feed.
Audio Adjustments
In order to ensure the highest possible transmission fidelity, the
transmitter must be modulating at least 50% with normal speech
(0 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 XLR-3 connector located on the back of the transmitter is
used for line level balanced or unbalanced audio source (up to +20 dBm).
c.
Set the AF Gain Control on the back of the base station to fully
counterclockwise. 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 0 dB yellow LED. Only peak level
of speech or music should deflect the VU meter full-scale into the last
red LED.
OPERATING INSTRUCTIONS