Radio Shack 21-1177 User Manual

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

Cat. No. 21-1177

Noise-CancellingDynamic CB Microphone

Your Radio Shack Noise-CancellingCB 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-InAcoustic Filter —reduces wind and pop noise.

2-FootCable with5-Pin(DIN) Connector— for easy connection to your CB or outdoor PA system.

Low-ImpedanceOperation— 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: TheBATT. 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.

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MOUNTING THE CLIP HANGER

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

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.

CONNECTING THE MICROPHONE

Plug your microphone’s 5-pinconnector into your transmitting device’s plug.

USING THE

MICROPHONE

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

USING THE AMP

To use the microphone’s internal preamplifier, set AMP. ON/OFF toON. AdjustVOL. to vary the output level of the amplifier. To turn off the amplifier, set the switch toOFF.

Note: TheVOL. setting only affects your transmitting volume and only works with

AMP. ON/OFF set to ON.

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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

Button In

#

(Receiver)

(Transmit)

 

 

 

 

 

 

1

Shield/Ground

Shield/Ground

 

 

 

2

Connected to

Floating Free

 

Pin 4

 

 

 

 

3

Floating Free

Grounded to

 

 

Pin 1

 

 

 

4

Connected to

Audio “Hot”

 

Pin 2

 

 

 

 

5

Grounded to

Floating Free

 

Pin 1

 

 

 

 

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.

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SPECIFICATIONS

Type ..........................................................

Dynamic Microphone with Push-to-TalkSwitch

Impedance ...........................................................................................

300 ohms at 1 kHz

Output Sensitivity ......................................

–64dB±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-pinDIN 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-ownedstores and authorized Radio Shack franchisees and dealers. Within this period, we will repair it without charge for parts and labor. Simplybring 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