Radio Shack Microphone 21 1177 User Guide

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 fre-  
quencies spoken directly into the micro-  
phone 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  
1. Push the tab on the battery com-  
partment cover in the direction of  
the arrow, then lift off the cover.  
Frequency Response — optimized for  
close-up vocal use.  
2. Install the batteries as indicated by  
the polarity symbols (+ and –)  
marked inside the compartment.  
Built-In Acoustic Filter — reduces wind  
and pop noise.  
2-Foot Cable with 5-Pin (DIN) Connec-  
tor — for easy connection to your CB or  
outdoor PA system.  
3. Replace the cover.  
When the BATT. LOW indicator lights, re-  
place the batteries.  
Low-Impedance Operation — lets you  
use your microphone with a wide range of  
equipment.  
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 sup-  
plied) to power your microphone. We rec-  
ommend 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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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 trans-  
ceivers 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
2
Shield/Ground  
Shield/Ground  
Floating Free  
Connected to  
Pin 4  
3
4
5
Floating Free  
Grounded to  
Pin 1  
Connected to  
Pin 2  
Audio “Hot”  
Grounded to  
Pin 1  
Floating Free  
Caution:  
If you are unsure about how to rewire the plug, do not risk damaging your equip-  
ment 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
 
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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  
as proof of purchase date to any Radio Shack store. Warranty  
Radio Shack sales slip  
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 WARRAN-  
TIES AND ANY IMPLIED WARRANTIES ARE LIMITED IN DURATION TO THE DURA-  
TION OF THE WRITTEN LIMITED WARRANTIES CONTAINED HEREIN. Some states  
do not permit limitation or exclusion of implied warranties; therefore, the aforesaid limi-  
tation(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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