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OPTIONAL CONVERSION
A split-bar TransmitlMonitor Switch is available for
use with transceivers with a receiver squelch circuit.
Depressing the Monitor bar disables the receiver
squelch circuit so that the operator can determine the
presence of signals below the squelch threshold before
transmitting. The Monitor switch is either momentary or
locking; and the switch can be wired either to ground or
to unground the squelch circuit. The Transmit switch
bar can be depressed only while the Monitor bar is de-
pressed, thus requiring the operator to verify that the
channel is idle before transmitting.
TheTransmit switch
is momentary only and cannot be locked. The
TransmitlMonitor Switch Kit is Shure Model RK199S.
General microphone wiring instructions are supplied
with the kit, but specific transceiver wiring details must
be obtained from the transceiver schematic
andlor the
manufacturer of the unit.
SPECIFICATIONS
Type
CONTROLLED MAGNETICB
Frequency Response
100 to 10,000 Hz (see Figure 2)
+I0
t
Z
10
B
B
=
10
g
_I
'-20
20
50
100 1.000 10,000 20poO
FREWENCY
IN
HERTZ
TYPICAL FREQUENCY RESPONSE
FIGURE
2
Polar Pattern
Omnidirectional
lmpedance
(at 1,000 Hz)
Dual. Microphone rating impedance is 150 ohms (210
ohms actual) and "High"
Load lmpedance Range
Minimum Recommended
High Impedance
.......
15 kilohms 100 kilohms
Low
Impedance
.......
150 ohms 1,000 ohms
Output Level
(at 1,000 Hz)
lmpedance
High Low
Open Circuit Voltage*
........
-53.0 dB -72.0 dB
(2.24
mV) (0.25 mV)
........................
Power Level** -50.5 dB
*O dB
=
1 volt per microbar
**0 dB
=
1 milliwatt per 10 microbars
Switches
Press-to-talk Switch
-
locking or nonlocking opera-
tion to actuate microphone circuit and an external
relay or control circuit. Microphone circuit normally
shorted in high-impedance position and normally
open in low-impedance position
lmpedance Selection Switch-double-pole,
double-
throw slide switch in microphone base to provide
either high- or low-impedance operation
Cable
2.lm (7 ft) four-conductor, two conductors shielded,
nondetachable
Case
Two-tone gray ARMO-DURB
6.4nmll,4 INITRAVEL
TO OPERATE SWITCH
OVERALL DIMENSIONS
FIGURE
3
Net Weight
736 grams (1 Ib 10 oz)
Shipping Weight
1020 grams (2 Ib 4 oz)
REPLACEMENT PARTS
Cartridge
................................................................
R44D
On-Off Switch
.......................................................
RK141 S
For additional service or parts information, please
contact Shure's Service Department at 1-800-516-2525.
Outside the United States, please contact your authorized
Shure Service Center.
OPTIONAL CONVERSION PART
TransmitIMonitor Split-Bar Switch Kit
..................
RK199S