User's Manual

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A120S In-Line Switch User Guide

27C8064 (Rev. 5) Printed in U.S.A.

GENERAL

The A120S Accessory in-Line Switch can be used to add an

On/OFF, Push-To-Talk, Cough Button, or Transmitter-Relay

Keying function to a microphone or other device rated at up

to 3 amps ac (0.5 Adc) 125V, non-inductive load. The switch

has gold-plated contacts for reliable performance even in

low-current circuits. The switch is a double-pole double-

throw type for maximum versatility. Its push button combines

with a rotary knob to provide either spring-return momentary

or locking action.

The unit is supplied with a crimp-on strain relief tor 6.4mm

(0.25-in.) diameter cable and with a ﬂex relief for either large

or small diameter cables. The permanently attached belt clip

can be rotated on the case to any of four positions for the

most convenience in use.

OPERATION

Switch Function Rotary Knob Position

On/Off (Button remains down

until depressed a second time)

Push-To-Talk (Button remains

down only while depressed)

Locking

Momentary

Locking the Switch Button Down

The switch button can be locked down by following these

steps:

Turn the rotary knob to Locking.

Press the switch button down.

Turn the knob to Momentary.

The button will remain locked down until the knob is returned

to locking and the button is depressed again.

SWITCH INSTALLATION AND WIRING

For thicker cable (e.g., one 6.4 mm [0.25 in.] diameter

cable or two 3.8 mm [0.15 in.] diameter cables), cut

off the bottom of the ﬂex relief at the rib. For narrower

cable (e.g., one 2.3 mm [0.39 in.] diameter cable),

use the entire ﬂex relief as supplied. Thread the cable

(s) through the ﬂex relief.

THICKER OR MULTIPLE

CABLES

SINGLE NARROWER

CABLE

FLEX RELIEF

FIGURE 1

For one 6.4 mm diameter cable (0.25 in.), crimp the

strain relief to the cable making sure the eyelet is to-

ward the raw end of the cable. Leave enough raw

cable above the strain relief to permit soldering the

individual conductors to the switch terminals.

NOTE: For all other cables, loosely knot the cable above

the ﬂex relief to form a strain relief. Leave enough raw

cable above the knot to permit soldering the individual

conductors to the switch terminals.

KNOTTED STRAIN RELIEF

6.4 mm (0.25 in.) CABL

STRAIN RELIEF FOR ONE

FOR OTHER CABLES

FIGURE 2

Summary of content (2 pages)

PAGE 1
A120S In-Line Switch User Guide GENERAL The A120S Accessory in-Line Switch can be used to add an On/OFF, Push-To-Talk, Cough Button, or Transmitter-Relay Keying function to a microphone or other device rated at up to 3 amps ac (0.5 Adc) 125V, non-inductive load. The switch has gold-plated contacts for reliable performance even in low-current circuits. The switch is a double-pole doublethrow type for maximum versatility.
PAGE 2
3. Solder the conductors to the switch terminals to obtain the desired function (see Figure 3 for switch conﬁguration.) Take care no to leave long bare conductors that may bridge across terminals and make unintended connections. NOTE: When the switch is used to make connections in the middle of a cable run, It is very important to preserve continuity in the cable shield.