User's Manual

2-9

2.4.1 Two/Four Wire Remote Control Board P/N 923051-1

Provides remote control base station operation on 2 wire or 4 wire, 600 ohm lines. This

board can be configured to key the transmitter using a 2175 Hz tone (2380 Hz upon

request), plus/minus DC Voltages, ground keying and internal or external current loop

keying. Transmit and Receive audio is user selectable for two wires or four wires. Crystals

for tone frequencies other than 2175 Hz or 2380 Hz may be obtained by special order.

See Figure 2-3 for location of jumpers referred to in the following table. Pins are numbers

increase as you go from top to bottom or left to right on the connector.

TABLE 2-3 REMOTE CONTROL BOARD P/N 923051-1 SETTINGS

CONTROL FUNCTION

J1 Jumper Pin 1 and Pin 2 for DC Current Loop Keying

Jumper Pin 2 and Pin 3 for ± DC Keying or Ground Keying.

Note: SW2 must be in position 2 if Pin 2 and Pin 3 are jumpered.

SW1

SW2

Y1,Y2

R22

R25

R44

R10

Jumper Pin 1 and Pin 2 for Ground Keying (Land Line).

Jumper Pin 1 and Pin 4 for ± DC Keying (Land Line).

Jumper Pin 2 and Pin 3 for Ground Keying (Single Key Line).

Jumper Pin 3 and Pin 6 for ± DC Keying (Single Key Line).

Jumper Pin 2 and Pin 5 for No Function.

Jumper Pin 1 and Pin 2 for ± DC or Ground Keying.

Jumper Pin 4 and Pin 5 for Tone Keying.

Note: Both Options may be selected.

Jumper Pin 2 and Pin 3 for No Function.

Jumper Pin 5 and Pin 6 for No Function.

Jumper Pin 1 and Pin 2 to enable Timeout Timer.

Jumper Pin 2 and Pin 3 to disable Timeout Timer.

Jumper Pin 1 and Pin 2 to for Internal Current Loop Keying.

Jumper Pin 2 and Pin 3 to for External Current Loop Keying.

Position 1 Selects 2 Wire Operation.

Position 2 Selects 4 Wire Operation.

Position 1 Selects Normal (Land Line Keying).

Position 2 Selects Local (Single Line Keying).

Determines Keying Tone Frequency.

Sets Tx Audio IN Level (Range -18 dBm to +10 dBm).

Sets Key Tone Level (Range -40 dBm to 0 dBm).

Sets Rx Audio OUT Level (Range -15 dBm to +10 dBm).

Sets Timeout Timer (Range 30 to 300 Seconds).

Sets Receive Audio Output Balance.