Shure CB41 User Guide

222 HARTREY AVE., EVANSTON.

IL.

60204 U.S A.

DATA

MODEL CB41

@

AREA

CODE

312/328-9000

.

CABLE

SHUREMICRO

SHEET

CONTROLLED MAGNETICB BASE STATION CITIZENS BAND MICROPHONE

CONNECTIONS

GENERAL

The Shure Model CB41 LONG RANGER base Sta­tion microphone is designed especially for use with
Citizens Band transceivers. For clearer transmission
and improved reliability, this sturdy dual-impedance

microphone can be used to replace ceramic or dy-

namic microphones supplied as original equipment.

Model CB41 provides crisp, undistorted voice re­sponse of high intelligibility and high output. Easy
impedance selection at the end of the coiled cable
makes the microphone suitable for connection to either
high-impedance or low-impedance (ceramic or dy­namic) inputs.

Height adjustment for maximum user comfort, a
momentary or locking press-to-talk transmit-receive

switch for greatest ease of use, and a selector switch
for either grounded or isolated transceiver switching

(no internal microphone wiring change required) make

the Model

CB41 the choice for unparalleled versatility.

The microphone is not affected by heat or humidity.
Its exclusive
grease, fumes, salt spray, sun, rust, and

ARMO-DUR@ case is immune to oil,

corrosion­and 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:

w

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

Adjustable height for maximum comfort
Momentary or locking press-to-talk transmit-receive

switch
Selector switch for either grounded or isolated

transceiver switching-no internal wiring change
required

Unequaled ruggedness and durability
Tough ARMO-DUR case

The internal connections of Model CB41 are shown

in Figure

-WE

Refer to the Shure CB Wiring Guide enclosed with
the microphone for detailed instructions for connect­ing the CB41

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. Passage of the CB41
cable through small-diameter connectors may be
eased by lubricating the outer jacket of the cable.

The general wiring procedure for transceiver con-

nections is as follows.

Relay or Switching Circuit:

GROUNDED SWITCHING

Most transceivers employ
switch from the receive to the transmit position. To
connect the microphone to such a circuit, proceed as
follows.

1. Turn the microphone upside down and check

2.

3.

4.

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. Turn the microphone upside down and check

2.

3.

1.

TRIWSYIT-REEIYL

SWITUI

WNW-ISOLATED

CAY

-w

INTERNAL

CONNECTIONS

FIGURE

1

to your transceiver. If your unit is not

a

grounded circuit to

that the Grounded-Isolated switch in the base-

plate is in the Grounded position.

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).

that the Grounded-Isolated switch in the base-

plate is in the Isolated position.

Connect the RED lead to the isolated switch con­tact terminal used to complete the transmitter

circuit.
Connect the BLACK lead to the other isolated

switch contact terminal used for power supply

voltage.

-I

Copyright

27A1314

(PH)

1976,

Shure

Brothers

Inc.

(OVER)

Printed

in

U.S.A.

4. 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

low­impedance 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.

phone circuit normally open in either high or low
impedance.

Grounded-Isolated Switch: Slide switch in micro­phone base. See section on Connections for function.

Cable

1.8m (6 ft) extended, four conductor, two conductors
individually shielded, coiled cable

Case

Black ARMO-DUR@

Dimensions

See Figure 2

OPERATION

Model CB41 will operate satisfactorily under all or­dinary conditions of humidity, heat, and cold. Dropping
the microphone, or other severe mechanical shocks
should be avoided.

SPECIFICATIONS

TY Pe

CONTROLLED MAGNETIC@

Frequency Response

200 to 6,000 Hz

Impedance

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

Open Circuit Voltage*

Open Circuit Voltage**

Power Level***

***O dB = 1 milliwatt per 10 microbars

Switches

Transmit-Receive Switch: Press-to-talk, momentary
or locking, leaf-type, to actuate microphone circuit
and transceiver relay or switching circuit. Micro-

(at 1,000 Hz)

.........

.......

.200 ohms to 1,000 ohms

.I5 kilohms to 100 kilohms

(at 1,000 Hz)

Low

.....

-323 dB
mV) (225 mV)

(25

....

-

72.0 dB -53.0 dB

(.25 mV) (2.25 mV)

...........

-51.0 dB

*O dB = 1 volt per 100 microbars

*

*O dB = 1 volt per microbar

IMPEDANCE

-13.0 dB

High

-

,

1

15j-4;1/gTN.l

'1

302 mmll-3!I6

OVERALL DIMENSIONS

FIGURE

6.4

mml114 IN.1TRAVEL

TO OPERATE SWITCH

IN1

2

4mm13132

..........

,3!~~~lINl

Net Weight

680 grams (1V2 Ib)

Packaged Weight

964 grams (2% Ib)

REPLACEMENT PARTS

Cartridge R44D
Cable 70A4135

Screen and Grille Assembly
Press-to-Tal k Switch
Base Plate and Switch Assembly

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

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

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

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

..........

.90E1060
.90A1033
.90A1864

FULL ONE YEAR WARRANTY

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.