Shure CB43 User Manual

222 HARTREY AVE. EVANSTON.

AREACODE312/3289000 . CABLE SHUREMICRO

60204 U S A

MODEL CB43

CONTROLLED MAGNETICm CITIZENS BAND MICROPHONE

CONNECTIONS

The internal connections of Model CB43 are shown

in Figure

CARTFIDOE

GREEN

-------------

\_!

INTERNAL

FIGURE

4is~l~~~ tCHffiSIS OR

CONNECTIONS

WHITEIWW IMPEDlWCEl

:WEEN

(HIGH IMmNCEI

ClRWlT

GRWNDl

GENERAL

The Model CB43 LONG RANGER CONTROLLED

MAGNETIC microphone is designed especially for use

with Citizens Band transceivers in either mobile or

base stations. For clearer transmission and improved reliability, this small, rugged, dual-impedance microphone can be' used to replace ceramic or dynamic microphones supplied as original equipment.

Model CB43 provides crisp, undistorted voice response of high intelligibility and high output. Easy impedance selection at the end of the cable makes the microphone suitable for connection to either

high-

impedance or low-impedance (ceramic or dynamic)

inputs.

The microphone fits naturally and comfortably in the hand and is not affected by heat or humidity. The exclusive

ARMO-DURO case is immune to oil, grease, fumes, salt spray, sun, rust, and corrosion-and is outstanding in its ability to resist mechanical shocks and vibration. The "Million-Cycle" leaf-type switch is designed to withstand rigorous

operating

conditions and

constant use.

Microphone Features:

Highly intelligible voice response Replaces either ceramic or dynamic original equip-

ment microphones Dual impedance-matches either high- or low-

impedance inputs Reliable high output CONTROLLED MAGNETIC

cartridge

Unparalleled ruggedness and durability

Tough ARMO-DUR case

Mounting bracket supplied-to fit hang-up button on back of microphone

Refer to the Shure CB Wiring Guide enclosed with the microphone for detailed instructions for connecting the CB43 to your transceiver. If your unit is not listed in the Guide, contact your dealer or Shure Brothers Incorporated for information. This microphone is not designed for use with transceivers requiring five-conductor shielded cable.

The general wiring procedure for transceiver connections is as follows.

Relay or Switching Circuit:

GROUNDED SWITCHING

Most transceivers employ a grounded circuit to switch from the receive to the transmit position. TO

connect the microphone to such a circuit, proceed as

follows.

1. Connect the RED lead to the terminal used to complete the transmitter circuit.

Connect the BLACK lead to the terminal used to complete the receiver circuit. This will usually be a ground return from the loudspeaker. If a microphone switching contact is not required for the loudspeaker ground, insulate (wrap with tape) the BLACK cable lead.

Connect the shield to chassis or circuit ground of the transceiver (see Guide).

ISOLATED SWITCHING

In some transceivers, an isolated circuit is required to switch power supply voltages rather than grounds. If an isolated switching circuit is required proceed as follows.

1. Remove the three No.

4-40

pan head screws from

the back of the microphone case; separate the

case front and back. CAUTION: Microphone case is spring-loaded; care must be taken to hold the two halves of the microphone case together while removing screws.

Clip and remove the bare lead connecting switch terminals

and 4 (see Figure 1).

3. Unsolder the BLACK cable lead from switch terminal

solder the BLACK cable lead to switch

terminal 4.

27A1318

(PF)

1976,

Shure

Brothers

Inc.

(OVER)

Printed

U.S.A.

4. Locate springs in cutouts of cartridge shield and take care not to pinch leads when closing case.

Fasten the two case halves together with the previously removed screws.

5. At the end of the cable, connect the RED lead to the isolated switch contact terminal used to

complete the transmitter circuit.

6. Connect the BLACK lead to the other isolated switch contact terminal used for power supply voltage.

7. Connect the shield to chassis or circuit ground

of the transceiver (see Guide). CAUTION Make certain that the shield is not connected to

chassis ground for those models where the Guide specifies the shield should be connected to circuit ground.

Microphone Audio Input Circuit:

LOW IMPEDANCE Connect the WHITE cable lead to the low-impedance

microphone audio input terminal. Insulate (wrap with tape) the GREEN lead.

HIGH IMPEDANCE (ceramic microphone replace-

ment)

Connect the GREEN cable lead to the

high-impedance microphone audio input terminal. Insulate (wrap with tape) the WHITE lead.

NOTE

The high-impedance connection will generally be used when replacing a ceramic microphone supplied with original equipment. If you do not know whether your transceiver requires a high-impedance or a

low-

impedance microphone, follow the wiring instructions for the low-impedance connection. Check whether there is sufficient output from your transceiver. If the

modulation output is too low, reconnect the micro-

phone for high impedance.

OPERATION

Model CB43 will operate satisfactorily under all or-

dinary conditions of humidity, heat, and cold. Dropping the microphone, or other severe mechanical shocks should be avoided.

Case

Light gray ARMO-DUR@

Dimensions

See Figure 2

2.4

rnm(3/32 IN.)

OVERALL

DIMENSIONS

FIGURE

Net Weight

225 grams (8 oz)

Packaged Weight

369 grams (13 oz)

MOUNTING

mounting bracket for permanent installation is

supplied with each microphone (see Figure 3).

MOUNTING HOLES, CLEARANCE

SCREWS

FOR

SPECIFICATIONS

TY Pe

CONTROLLED MAGNETIC@

Frequency Response

200 to 5.000 Hz

lmpedance (at 1,000 Hz)

Dual. Microphone rating impedance is 150 ohms (190 ohms actual) and "High". For impedance selec-

tion, see section on Connections.

Load lmpedance Range

Low Impedance High Impedance

Output Level (at 1,000 Hz)

Open Circuit Voltage* Power Level8*

*O dB

**0 dB

Switch

Push-to-talk leaf-type switch to actuate microphone circuit and transceiver relay or switching circuit. Mi-

crophone circuit normally open in either high or low impedance.

Cable

1.5113 (5 ft) extended, four conductor, two conductors individually shielded, coiled cable

.........

.......

............

volt per 100 microbars

1 milliwatt per 10 microbars

.200 ohms to 1,000 ohms

.I5 kilohms to 100 kilohms

Low

.....

-32.0 dB mV) (225 mV)

(25

-51.0 dB

IMPEDANCE

Hiah

MOUNTING

BRACKET

FIGURE

FURNISHED ACCESSORY

Mounting Bracket RKGMB

.........................

REPLACEMENT PARTS

Cartridge Switch

..................................

90F1008

R44D

Switch Button .......................... .65A240A

Cable Case Front Case Back

...................................

..............................

FULL ONE YEAR

WARRANTY

70A4137 9021046

90M1047

Shure Brothers Incorporated ("Shure"), 222 Hartrey Avenue, Evanston, Illinois 60204, warrants to the owner of this product that it will be free, in normal use, of

any defects in workmanship and materials for a period of one year from date of purchase. You should retain

proof of date of purchase. Shure is not liable for any consequential damages. If this Shure product has any defects as described above, carefully repack the unit

and return it, prepaid to the above address. If you are

not in the United States, return the unit to your dealer or authorized Service Center for repair. The unit will

be repaired or replaced and returned to you promptly,

and if it cannot be repaired or replaced, you may elect

to receive a refund.