RECEIVER
Sensitivity
AM: 0.5
µ
V for 10 dB (S+N)/N at greater than
½ -watt of audio output.
FM: 1.0
µ
V for 20 dB (S+N)/N at greater than
½-watt of audio output.
Selectivity
AM/FM: 6 dB @ 3 KHz, 50 dB @ 9 KHz.
Image Rejection
More than 65 dB.
IF Frequency
AM/FM: 10.695 MHz 1
st
IF, 455 KHz 2
nd
IF
Adjacent-Channel
Rejection
60 dB AM
RF
Gain
Control
45 dB adjustable for optimum signal
reception.
Automatic Gain Control
(AGC)
Less than 10 dB change in audio output for
inputs from 10 to 100,000 microvolts.
Squelch
Adjustable; threshold less than 0.5
µ
V.
ANL Switchable
Noise Blanker
RF type
Audio Output Power
4 watts into 8 ohms.
Frequency Response
300 to 2800 Hz.
Built-in Speaker
8 ohms, round.
External Speaker (Not
Supplied)
8 ohms; disables internal speaker when
connected.
ATERNATE MICROPHONES AND INSTALLATION
For best results, the user should select a low-impedance dynamic type
microphone or a transistorized microphone. Transistorized type microphones have
a low output impedance characteristic. The microphones must be provided with a
four-lead cable. The audio conductor and its shielded lead comprise two of the
leads. The fourth lead is for receive control, and the third is for transmit control.
The microphone should provide the functions shown in schematic below.
4 WIRE MIC CABLE
Pin Number
Mic Cable Lead
1 Audio
shield
2 Audio
Lead
3 Transmit
control
4 Receive
Control
Fig. 1
Your transceiver microphone schematic.
If the microphone to be used is provided with pre-cut leads, they must be revised as
follows.
1. Cut leads so that they extend 7/16” beyond the plastic insulating jacket of the
microphone cable.
2. All leads should be cut to the same length. Strip the ends of each wire 1/8” and
tin the exposed wire.
Before beginning the actual wiring read carefully, the circuit and
wiring information provided with the microphone you select. Use the
minimum head required in soldering the connections. Keep the exposed
wire lengths to a minimum to avoid shorting when the microphone plug is
reassembled.
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