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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-imped-
ance 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 CB41 will operate satisfactorily under all or-
dinary 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 (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
. . . . . . . . .
.200 ohms to 1,000 ohms
High Impedance
. . . . . . .
. I 5 kilohms to 100 kilohms
Output Level (at 1,000 Hz)
IMPEDANCE
Low
High
-
Open Circuit Voltage*
. . . . .
- 3 2 3 dB
-13.0 dB
(25 mV)
(225 mV)
Open Circuit Voltage**
. . . .
-
72.0 dB
-53.0 dB
(.25 mV)
(2.25 mV)
Power Level***
. . . . . . . . . . .
-51.0
dB
*O dB = 1 volt per 100 microbars
* *O dB = 1 volt per microbar
***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-
phone circuit normally open in either high or low
impedance.
Grounded-Isolated Switch: Slide switch in micro-
phone 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
,
6.4
mml114 IN.1TRAVEL
TO OPERATE SWITCH
. . . . . . . . . .
1
1 5 j - 4 ; 1 / g T N . l
' 1
3 0 2 mmll-3!I6 IN1
4mm13132
, 3 ! ~ ~ ~ l I N l
OVERALL DIMENSIONS
FIGURE 2
Net Weight
680 grams (1V2 Ib)
Packaged Weight
964 grams (2% Ib)
REPLACEMENT PARTS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cartridge
R44D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable
70A4135
Screen and Grille Assembly
. . . . . . . . . . . . . .
.90E1060
Press-to-Tal k Switch
. . . . . . . . . . . . . . . . . . . . .
.90A1033
Base Plate and Switch Assembly
. . . . . . . . . .
.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.
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