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The VXR-9000 repeater is provided with a 25-pin DB-
25F female connector for interconnections to
accessories.Use a DB-25M 25-pin male connector to con-
nect accessories to the repeater. The pins on the acces-
sory connector are explained in detail as follows:
Pin 1: GND
Chassis ground for all logic levels and power supply
return.
Pin 2: +13.6 V
[ P
]
S
This pin provides 13.6 Volts, 2.0 A, DC from the repeater
supply. There is a internal 3 A fuse to prevent damage
to the repeater.
Pin 3: TX AF IN
[ A
T
I
This pin is audio input. Input impedance is 600 Ohms.
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
[ T
] ( S -
I
This pin is sub-audiable tone input. The input imped-
ance is 600 Ohms, and has a flat response characteristic
(repeater deviation is constant for a given signal level
over the frequency range of 5 ~ 250 Hz). Injecting too
high a voltage here causes over-deviation of CTCSS or
DCS, degrading performance.
Use shielded cable to connect to this pin, connecting the
shield to GND.
DB-25 P N
VXR-9000 FM R
] ( V
: 300 ~ 3,000 H )
B
: 5 ~ 250 H )
B
O
M
DB-25 C
Pin 5: TX ATT
This output is intended for controlling an external co-
axial switching relay. It is an open drain output which
can sink approx. 1.5 A when active. The delay time
which is between the repeater cause to transmit mode
and this port switches to ground can be programmed
by your VERTEX STANDARD dealer.
Pin 6: DISC OUT
[ A
] ( W
O
-B
Received signals with full system deviation produce
350 mVrms audio at this pin. The output impedance is
600 Ohm, 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: N.C.
No connection.
Pin 8: RSSI
[ A
O
]
A DC voltage proportional to the strength of the signal
currently being received (Receiver Signal Strength In-
dicator) 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:
(DC V)
2.5
2.0
1.5
1.0
0.5
0
–60
–70
–80
Input Signal Level
Pin 9: COAX. SW
[ L
( A
O
L
This output is intended for controlling an external co-
axial switching relay. It is an open drain output which
can sink approx. 1.5 A when active. This signal only
switches if the repeater has been programmed for "SIM-
PLEX" mode. If programmed for "DUPLEX," the signal
remains open (high impedance) at all time.
P
: 0 ~ 3,000 H )
–90
–100
–110
–120 (dBm)
)]
7
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