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 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 V audio at this pin. The output imped-
p-p
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.
4
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:
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
VXR-7000 FM R O
EPEATER PERATING
M
ANUAL