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VXR-7000 FM REPEATER OPERATING MANUAL4

The VXR-7000 repeater is provided with a 25-pin DB-

25F female connector for interconnections to accesso-

ries. Use a DB-25M 25-pin male connector to connect

accessories to the repeater. The pins on the accessory

connector are explained in detail as follows:

Pin 1: GND

Chassis ground for all logic levels and power sup-

ply return.

Pin 2: +13.8 V [Power Supply]

This pin provides 13.8 Volts, 1.0 A, regulated DC

from the repeater supply. Use a 1 A fuse in the ex-

ternal device’s DC line to prevent damage to the re-

peater.

Pin 3: TX AF IN [Analog Transmitter Input]

(Voice Band: 300 ~ 3,000 Hz)

Input impedance is approx. 600 Ω. This audio is in-

jected before the splatter filter stage, so excess sig-

nal input levels are clipped.

Use shielded cable to connect to this pin, and con-

nect the shield to GND.

Pin 4: TONE IN [Transmitter Input]

(Sub-audible Band: 6 ~ 250 Hz)

The input is high impedance (approx. 22 kΩ). In-

jecting too high a voltage here causes over-devia-

tion of CTCSS or DCS, degrading performance. Use

shielded cable to connect to this pin, connecting the

shield to GND.

Pin 5: N.C. (No connection.)

Pin 6: DISC OUT [Analog Output]

(Wide-Band: 0 ~ 3,000 Hz)

Received signals with standard deviation produce

approx. 1 Vp-p audio at this pin. The output imped-

ance is approx. 600 Ω, and is extracted before the

de-emphasis and squelch circuitry. Use shielded

cable to connect to this pin, and connect the shield

to GND.

Pin 7: GND

Chassis ground for all logic levels and power sup-

ply return.

Pin 8: RSSI [Analog Output]

A DC voltage proportional to the strength of the sig-

nal currently being received (Receiver Signal

Strength Indicator) is provided on this pin. This low

impedance output is generated by the receiver IF

sub-system and buffered by an internal op-amp.

Typical voltages are graphed as follows:

ACC Connector Port

Pin 9: COAX. SW [Logic Output (Active Low)]

This output is intended for controlling an external

coaxial switching relay. It is an open collector out-

put which can sink approx. 10 mA when active. This

signal only switches if the repeater has been pro-

grammed for “SIMPLEX” mode. If programmed

for “DUPLEX,” the signal remains open (high im-

pedance) at all time.

Pin 10: N.C. (No connection.)

Pin 11: NSQ DET

This is an open-collector, active-low output capable

of sinking about 10 mA. It indicates that the receiver

squelch is open. If the squelch control is properly

set, this indicates a carrier on the receiver channel.

Pin 12: EXT PTT

This input is internally pulled up to 5 VDC. When

pulled low by an external device, it keys the repeater

transmitter while the repeater is operating in the

“BASE” mode. Avoid voltage in excess of 5 V on

this pin, or internal damage to the microprocessor

on the repeater CNTL Unit may result.

ACC Jack

DB-25 Pin Numbering

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