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Table 4-1.
Controls, Indicators, and Connectors (Cont)
Item
Description
Function
-
Mod Out connector
BNC connector
Output connector for all modulation signals
-
(all signals combined).
Volume control
Potentiometer
Controls speaker output level.
BW switch
Two-position switch
In either Pwr Mon or Monitor modes selects
IF bandwidth. NB is ±6kHz mod acceptance
bandwidth. WB is ±100kHz mod acceptance
-
bandwidth. In Gen FM mode selects modulation
range. 0-25 kHz dev in NB mode or 0-100 kHz
dev in WB mode.
BFO control
Potentiometer/switch
BFO on/off and beat frequency control
for sideband
re~eption.
Full Counterclockwise
position is off.
NOTE: To minimize interference the BFO
should be turned off when not in use.
Sig Lvi/Zero Beat
LED (red)
Flashes at a rate equal to the difference
indicator
between the received carrier frequency and the
programmed frequency. Also is used as a
squelch indicator.
Squelch control
Potentiometer
Adjusts squelch threshold level, full counter-
clockwise position disables squelch.
NOTE: Monitor sensitivity is greatly decreased
-
(for high-level use) as the control is increased
clockwise beyond the quieting point.
lmage/Dplx switch
Two-position switch
In duplex generation mode, contro!s the duplex
frequency output for above (High) or below
(Low) the receive programmed frequency. In the
~~i i;~;:;
monitor mode it selects the frequency of the
.,~
~~
local oscillator injection above or below the
programmed monitor frequency to remove
image interference.
Demod Out
BNC connector
Receiver audio output.
connector
Oscilloscope Horiz
Seven-position
When in the oscilloscope mode, selects the
switch
rotary switch
horizontal sweep rate or selects the external
-
horizontal input.
-
4-9
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