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SPLIT BAR SWITCH KIT
The Shure Model RK199S Split Bar Switch Kit is designed to
enable users of Shure base station microphones to monitor a
communications channel by disabling the receiver squelch circuit
before transmitting. Once installed, the microphone Transmit
switch can be depressed only while the Monitor switch is
depressed. The Monitor switch can be momentarily depressed, or
locked in the “on” position by depressing it and sliding it forward.
The RK199S is especially useful in shared-channel radio
systems using a continuous tone coded squelch system (CTCSS).
CTCSS requires the addition of a tone encoder at the transmitter
and a decoder at the receiver. The transmitted carrier is
continuously modulated with a subaudible tone which is
demodulated and decoded at the receiver, and used to activate the
squelch circuit. The receiver remains squelched until it receives a
carrier modulated with a tone of the proper frequency. The
RK199S is designed to be installed in Shure Model 444D, 450 and
522 Base Station Microphones. The RK199S consists of the
following parts.
ITEM
PART NO.
Five-Blade Switch 90A3119
Three-Blade Switch 90A946
Transmit Switch Bar-Spring Assembly 90A1022
Monitor Switch Bar 65A1177A
Right-Angle Bracket 53A667
Transmit Label 28A366
Monitor Label 28B366
Lubriplate Capsule 90MF1371
1
/
2
” No. 4 Phillips Head Self-Tapping
Screws (2)
30E689A
5
/
16
” No. 4 Binding Head Self-Tapping
Screws (2)
30C640C
INSTALLATION
Install the RK199S as follows.
1. Remove the two screws fastening the baseplate to the
bottom of the microphone.
2. Remove the baseplate, taking care not to stress the wiring
to the switch mounted in the baseplate.
3. Loosen (unscrew about one turn), but do not remove, the
screws holding the switch mounting plate to the base (see
Figure 1). NOTE: The screws should be loosened only
enough to allow the switch bar to be pushed down and out
from underneath the switch mounting plate. If the plate is
loosened too much, the tip of the mounting bracket
extending through the upright portion of the base will slip
out of the slot in the switch mounting plate. The tip must
be replaced in the slot before reassembly can be
accomplished.
4. Install the switch bars in the base, beginning with the
Monitor (smaller of the two bars). Slip the pivot of the bar
beneath the switch mounting plate, and snap it into place.
Insert the Transmit bar (larger of the two bars) in the same
manner, and tighten the screws holding the switch
mounting plate to the base. Check the position of the
mounting bracket tip as described in step 3.
MODEL RK199S SPLIT BAR SWITCH KIT
(INSTALLED)
FIGURE 1
Model RK199S User Guide
27B2417 (AD)
2001, Shure Incorporated
Printed in Mexico