Radio Shack 21 1177 Users Manual

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21-1177.fm Page 1 Thursday, August 5, 1999 8:44 AM

Cat. No. 21-1177

Noise-Cancelling Dynamic CB Microphone
Your Radio Shack Noise-Cancelling CB
Microphone is designed for use with your
CB in your vehicle, where background
noise is a problem. It picks up voice frequencies spoken directly into the microphone and filters out background noise
from vehicles, wind, the car radio, etc.
The microphone is also ideal for a mobile
or outdoor PA system.

FEATURES
Frequency Response — optimized for
close-up vocal use.
Built-In Acoustic Filter — reduces wind
and pop noise.
2-Foot Cable with 5-Pin (DIN) Connector — for easy connection to your CB or
outdoor PA system.
Low-Impedance Operation — lets you
use your microphone with a wide range of
equipment.

1. Push the tab on the battery compartment cover in the direction of
the arrow, then lift off the cover.
2. Install the batteries as indicated by
the polarity symbols (+ and –)
marked inside the compartment.
3. Replace the cover.
When the BATT. LOW indicator lights, replace the batteries.
Note: The BATT. LOW indicator lights
briefly when you release the switch on
the microphone’s side.

INSTALLING THE
BATTERIES
You need two AAA batteries (not supplied) to power your microphone. We recommend alkaline batteries, such as Cat.
No. 23-555.

© 1995 Tandy Corporation.
All Rights Reserved.
Radio Shack is a registered trademark used by Tandy Corporation.

21-1177.fm Page 2 Thursday, August 5, 1999 8:44 AM

MOUNTING THE CLIP
HANGER

USING THE
MICROPHONE

You can hang the microphone on your
CB’s existing mounting bracket, or use
the supplied clip hanger and screws.

Push the switch on the microphone’s side
to send a transmission. Release the
switch to receive.

To mount the clip hanger, use it as a template and drill two holes at the desired locations on the vehicle’s dashboard. Then
use the supplied screws to mount the clip
hanger on the dashboard.
Caution: Be sure not to drill into objects
behind the dashboard.

USING THE AMP
To use the microphone’s internal preamplifier, set AMP. ON/OFF to ON. Adjust
VOL. to vary the output level of the amplifier. To turn off the amplifier, set the
switch to OFF.
Note: The VOL. setting only affects your
transmitting volume and only works with
AMP. ON/OFF set to ON.

CONNECTING THE
MICROPHONE
Plug your microphone’s 5-pin connector
into your transmitting device’s plug.

2

21-1177.fm Page 3 Thursday, August 5, 1999 8:44 AM

REWIRING THE MICROPHONE’S DIN PLUG
The following chart shows the function of the pins in the microphone cord’s DIN plug. This
information is provided in case you need to rewire the plug to be compatible with CB
brands other than Radio Shack, or with various business band, ham, and broadcast transceivers and PA equipment.
Important: Do not cut the microphone’s wires. If you cut any wire, you cannot obtain a
refund or exchange on this product. Radio Shack will provide warranty service if you cut
a wire and find the product is defective.
.

Pin
#

Button Out
(Receiver)

Button In
(Transmit)

1

Shield/Ground

Shield/Ground

2

Connected to
Pin 4

Floating Free

3

Floating Free

Grounded to
Pin 1

4

Connected to
Pin 2

Audio “Hot”

5

Grounded to
Pin 1

Floating Free

Caution: If you are unsure about how to rewire the plug, do not risk damaging your equipment and possibly violating FCC regulations. Take your microphone, this owner’s manual,
and the transmitting device to your local Radio Shack store for service. Only an accurate
circuit analysis can ensure proper compatibility between the microphone and the device
to which you connect it.

3

21-1177.fm Page 4 Thursday, August 5, 1999 8:44 AM

SPECIFICATIONS
Type ..........................................................Dynamic Microphone with Push-to-Talk Switch
Impedance ........................................................................................... 300 ohms at 1 kHz
Output Sensitivity ...................................... –64 dB ±3 dB at 1 kHz with Maximum Volume
(0 dB = 1 V/µ bar, Distance 0.5M)
Characteristic .......................................................................................... Noise-Cancelling
Cable................................................................................Coiled Cord with 5-pin DIN Plug
Battery Type ............................................................................Two AAA Alkaline Batteries
(such as Cat. No. 23-555, not supplied)
Included Accessories ................................................... One Clip Hanger and Two Screws
Specifications are typical; individual units might vary. Specifications are subject to change
and improvement without notice.

RADIO SHACK LIMITED WARRANTY
This product is warranted against defects for 90 days from date of purchase from Radio
Shack company-owned stores and authorized Radio Shack franchisees and dealers.
Within this period, we will repair it without charge for parts and labor. Simply bring your
Radio Shack sales slip as proof of purchase date to any Radio Shack store. Warranty
does not cover transportation costs. Nor does it cover a product subjected to misuse or
accidental damage.
EXCEPT AS PROVIDED HEREIN, RADIO SHACK MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED WARRANTIES ARE LIMITED IN DURATION TO THE DURATION OF THE WRITTEN LIMITED WARRANTIES CONTAINED HEREIN. Some states
do not permit limitation or exclusion of implied warranties; therefore, the aforesaid limitation(s) or exclusion(s) may not apply to the purchaser.
This warranty gives you specific legal rights and you may also have other rights which vary from
state to state.

We Service What We Sell

9/94

RADIO SHACK
A Division of Tandy Corporation
Fort Worth, Texas 76102
4A5

Printed in Taiwan
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