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VXR-7000 FM REPEATER OPERATING MANUAL6

The VXR-7000 is provided with an 8-pin modular jack

for line interfacing applications. A Western Electric

modular-type RJ45 plug should be used to connect to

this jack. The LINE jack pin-out is shown below.

Note that there are both 4-line and 8-line types of modu-

lar plugs. If a 4-line modular plug is used, only the LINE

OUT and LINE IN connections will be made. An 8-line

plug is required to access all lines. In accordance with

standard telecommunications interface, the line connec-

tions on the LINE interface jack are impedance balanced,

and are described as follows.

Pins 1 & 2: [RX SQ(+), RX SQ(–)]

An opto-isolator is provided to facilitate E (EAR)

signaling. The opto-isolator comes on when a signal

exceeding the receiver squelch appears on the re-

ceiver channel (with correct CTCSS tone or DCS

code, if enabled). The RX SQ(–) pin is the emitter,

and RX SQ(+) is the collector.

Pins 3 & 4: [LINE IN (Tx Line Audio)]

Analog signals between 300 and 3000 Hz supplied

to this pair are fed to the transmitter when the re-

peater is set to the BASE mode (the REPEATER LED

is turned off) and keyed either by the TX KEY input

signal (see below), or by the EXT PTT signal on pin

12 of the rear panel’s ACC jack. Standard deviation

is obtained with a line level of –10 dBm.

Pins 5 & 6: [LINE OUT (Rx Line Audio)]

Receiver audio is available from this pair, subject to

internal CTCSS or DCS decode if the received sig-

nal strength is above the squelch threshold.

As shipped from the factory, a 1-kHz receiver signal

with standard deviation gives –10 dBm on the line,

but this can be varied by VR4002 and S4001 (on the

repeater’s CNTL Unit).

Pins 7 & 8 [TX KEY(+), TX KEY(–)]

An opto-isolator is provided to facilitate M (MIC)

signaling. That is, a voltage presented to these pins

turns on the opto-isolator and keys the transmitter.

The TX KEY(+) pin is the anode of the opto-isolator,

and RX SQ(–) is the cathode of the opto-isolator.

LINE Interface Port

LINE Jack

Modular Jack Pin Numbering

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 21 22

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Vertex Standard VXR-7000 Spécifications Page 8

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