Acc.connector.port - Vertex Standard VXR-7000 Operating Manual

ACC Connector Port
The VXR-7000 repeater is provided with a 25-pin
DB-25F female connector for interconnections to ac-
cessories. 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 fol-
lows:
Pin 1: GND
Chassis ground for all logic levels and power
supply 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
repeater.
Pin 3: TX AF IN [ Analog Transmitter Input ]
( Voice Band: 300 ~ 3,000 Hz )
Input impedance is approx. 600 Ω. This audio is
injected before the splatter filter stage, so excess
signal input levels are clipped.
Use shielded cable to connect to this pin, and
connect 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-devi-
ation of CTCSS or DCS, degrading performance.
Use shielded cable to connect to this pin, connect-
ing 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 pro-
duce approx. 1 V audio at this pin. The output
p-p
impedance is approx. 600 Ω, and is extracted be-
fore 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
supply return.
4
Pin 8: RSSI [ Analog Output ]
A DC voltage proportional to the strength of the
signal currently being received (Receiver Signal
Strength Indicator) is provided on this pin. This
low impedance output is generated by the receiv-
er IF sub-system and buffered by an internal op-
amp. Typical voltages are graphed as follows:
(DC V)
2.5
2.0
1.5
1.0
0.5
0
-60
Pin 9: COAX. SW [ Logic Output ( Active Low )]
This output is intended for controlling an exter-
nal coaxial switching relay. It is an open collec-
tor output which can sink approx. 10 mA when
active. This signal only switches if the repeater
has been programmed for "SIMPLEX" mode. If
programmed for "DUPLEX", the signal remains
open (high impedance) at all time.
Pin 10: N.C. ( No connection. )
Pin 11: NSQ DET
This is an open-collector, active-low output ca-
pable 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 receiv-
er 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 op-
erating in the "BASE" mode. Avoid voltage in ex-
cess 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
VXR-7000 FM Repeater Operating Manual
-70 -80 -90 -100
Input Signal Level
-110 -120
(dB )