Motorola R-2001A Service Manual page 34

Item
Mod Out connector
Volume control
BW switch
BFO control
Sig Lvl/Zero Beat
indicator
Squelch control
Image/Dplx switch
Demod Out
connector
Oscilloscope Horiz
switch
Table 4-1. Controls, Indicators, and Connectors (Cont)
Description
BNC connector
Potentiometer
Two-position switch
Potentiometer/switch
LED (red)
Potentiometer
Two-position switch
BNC connector
Seven-position
rotary switch
Output connector for all modulation signals
(all signals combined).
Controls speaker output level.
In either Pwr Mon or Monitor modes selects
IF bandwidth. NB is ±6 kHz mod acceptance
bandwidth. WB is ±100 kHz 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 on/off and beat frequency control
for sideband reception. Full Counterclockwise
position is off.
NOTE: To minimize interference the BFO
should be turned off when not in use.
Flashes at a rate equal to the difference
between the received carrier frequency and the
programmed frequency. Also is used as a
squelch indicator.
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.
In duplex generation mode, controls the duplex
frequency output for above (High) or below
(Low) the receive programmed frequency. In the
monitor mode it selects the frequency of the
local oscillator injection above or below the
programmed monitor frequency to remove
image interference.
Receiver audio output.
When in the oscilloscope mode, selects the
horizontal sweep rate or selects the external
horizontal input.
4-9
Function