Radio Shack 21-1177 User Manual

21-117 7.fm Page 1 Thursday, August 5, 1999 8:4 4 AM

Noise-Cancelling Dynamic C B 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 al so ideal for a mobil e
or outdoor PA system.

Cat. No. 21-1177

FEATURES

Frequency Response

close-up vocal use.

Built-In Acoustic Filter —

and pop noise.

2-Foot Cable with 5-Pin (DIN) Connec­tor

— for easy connection to your CB or

outdoor PA system.

Low-Impedance Operation

use your micr ophone with a wide range o f
equipment.

— optimized for

reduces wind

— lets you

INSTALLING THE
BATTERIES

You need two AAA batteries (not sup­plied) t o power yo ur mic roph one. We rec ­ommend alkaline batteries, such as Cat.
No. 23-555.

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
place the batteries.

Note:

briefly when you release the switch on
the microphone’s side.

BATT. LOW

The

indicator lights, re-

BATT. LOW

indicator lights

©

1995 Tandy Corporation.

Radio Shack is a registered trademark used by Tandy Corporation.

All Rights Reserved.

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MOUNTING THE CLIP
HANGER

You can hang the microphone on your
CB’s existin
the supplied clip han

To mount the clip han
plate and drill two holes at the desired lo­cations on the ve hicle ’s dashboa rd. Then
use the suppli ed scre ws to mo unt the c lip
han

er on the dashboard.

Caution:

behind the dashboard.

mounting bracket, or use

er and screws.

er, use it as a tem-

Be sure not to drill into objects

CONNECTING THE
MICROPHONE

USING THE
MICROPHONE

Push the switch on t he microphone’ s side
to send a transmission. Release the
switch to rece ive.

USING THE AMP

To use the microphone’s internal pream­plifier, set

VOL.

fier. To turn off the amplifier, set the
switch to

Note

transmittin

AMP. ON /OFF

AMP. ON/OFF

to vary the output level of the ampli-

OFF.

VOL.

: The

setting only affects your

volume and only works with

set to ON.

to ON. Adjust

Plug your microphone’s 5-pin connector
into you r tr an s m i ttin

device’s plug.

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REWIRING THE MICROPHONE’S DIN PLUG

The following chart shows th e funct ion of t he p ins in the micr ophone cor d’ s DIN plug. This
information is provided in case you need to rewire the plu
brands other than Rad io Shac k, or wi th v arious bu siness ban d, ham, an d br oad cast t rans­ceivers and PA equipment.

to be compatible with CB

Important:

refund or exchan

Do not cut the microphone’s wires. If you cut any wire, you cannot obtain a

e on this product. Radio Shack will provide warranty service if you cut

a wire and find the product is defective.

.

Caution:

If you are u nsure ab out how to rewire t he plu
ment and possibly violatin
and the transmit ti n

device to your local Radio Shack store for service. Only an accurate

Pin #Button Out

(Recei ver)

1 Shield/Ground Shield/Ground
2 Connected to

Pin 4

3 Fl oating Free Grounded to

4 Connected to

Pin 2

5 Grounded to

Pin 1

FCC regulations. Take your micro phone, this owner’ s manual,

Button In

(Transmit)

Floating Free

Pin 1
Audio “H ot”

Floating Free

, do not risk damaging your equip-

circuit analysis can ensure proper compatibility between the microphone and the device
to which you connect it.

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SPECIFICATIONS

Type ..........................................................Dynamic Microphone with Push-to-Talk Switch

Impedance...................................................... .. ................................... 300 ohms at 1 kHz

Output S en s itivity . ...................... .. .. ........... –64 dB ±3 dB at 1 kHz with Maximum Volume

(0 dB = 1 V/

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

Specificati ons are t ypical ; indi vidual unit s might v ary. Specificat ions ar e subj ect to chang e
and improvement without notice.

µ

bar, Distance 0.5M)

RADIO SHACK LIMITED WARRANTY

This product is warranted against defects for 90 days from date of purchase from Radio
Shack co mpany-own ed stores an d authorize d Radio Shack fr anchisee s and dealers .
Within this period, we will repair it without charge for parts and labor. Simply

Radio Shack sales sl ip

does not cover transportation costs. Nor does it cover a product subjected to misuse or
accidental damage.
EXCEPT AS PROVI DED HE REIN, RADI O SHA CK M AK ES 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 pe r m it lim i t at io n or ex cl us io n of im pl ie d w arr a nt ies; th erefore, the afo r e sa id li mi­tation(s) or exclusion(s) may no t apply to the purchaser.

This warranty gives you specific l egal rights and y ou may also h ave other rights which vary from
state to state.

as proof of purchase date to any Radio Shack store. Warranty

We Se rvi ce What We Sell

brin

our

9/94

RADIO SHACK

A Division of Tandy Corporation

Fort Worth, Texas 76102

4A5 Printed in Taiwan