Model RK199S User Guide, Split BAR Switch KIT

Model RK199S User Guide

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 ªonº 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

1/2º No. 4 Phillips Head Self-Tapping	30E689A
Screws (2)

5/16º No. 4 Binding Head Self-Tapping	30C640C
Screws (2)

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

2001, Shure Incorporated

27B2417 (AD)

Printed in Mexico