Realistic 21-1171 Instruction Manual

HAND HELD DYNAMIC MICROPHONE
With Built-in Solid State Preamplifier
Catalog Number: 21-1171
SPECIFICATIONS
Type
Impedance
Output
Frequency
Directivity
Cable
Battery type :
Accessories :
Dynamic microphone with pre-
amplifier.
Hand held, with push-to-talk switch.
3.3K at 1 kHz (10KS2 load).
—42 dB at 1 kHz (volume at maxi-
mum) =6 millivolts.
400-5,000 Hz ±6 dB..
Omni-directional.
Coiled cord, terminated with 5-pin
DIN type plug.
7 volts mercury battery (Radio Shack
Catalog Number 23-601 or equiva-
lent).
Clip-hanger 1
Screw 2
This deluxe microphone incorporates a built-in pre-amplifier to assure high modulation levels.
It utilizes a 2 stage transistorized amplifier specifically designed to provide communications type
frequency response. It comes complete with a 5-pin DIN plug on the end of a coiled cord. The
clip-hanger can be mounted in any convenient location with the screws provided.
The Microphone is designed for use with CB Transceivers (and other equipment) where the
additional gain provided by the pre-amplifier may be helpful in maintaining maximum modulation
level — and thus maximum talk power and signal "punch". It can be used as a direct replace-
ment in the following REALISTIC CB Transceivers, Catalog Numbers: 21-126/128/136/139/
144/146/149. With 21-124, the DIN plug must be re-wired as follows: move wire from Pin
1 to Pin 2; move wire from Pin 4 to Pin 1; move wire from Pin 2 to Pin 4.
With some units on the market, it may be necessary to re-wire the DIN plug, or the Mic
jack on the Transceiver. Use the information provided below to aid you in making the proper
connections. If you have difficulty, check with a qualified Electronic Service Technician—take
this instruction sheet and the Instruction Manual for your Transceiver.
FUNCTION/OPERATION OF MIC CONNECTOR PINS
Pin Number Button Out (Receive)
Button In (Transmit)
1 Shield/Ground for Audio
Shield/Ground for Audio
2
Connected to + buss of
Floating free
Pre-amplifier
3 Floating free
Grounded (to Pin 1)
4 Audio "hot" Audio "hot"
5 Grounded Floating free