VXR-9000 FM REPEATER OPERATING MANUAL
DB-25 CONNECTOR PORT
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
[
POWER SUPPLY
]
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
[
ANALOG TRANSMITTER INPUT
]
(
VOICE BAND: 300 ~ 3,000 HZ
)
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
[
TRANSMITTER INPUT
]
(
SUB-AUDIBLE BAND: 5 ~ 250 HZ
)
This pin is sub-audiable input. The input is high im-
pedance (approx. 22 k-ohms), and has a flat response
characteristic (repeater deviation is constant for a given
signal level over the frequency range of 5 ~ 250 Hz). In-
jecting 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.
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
[
ANALOG OUTPUT
]
(
WIDE-BAND: 0 ~ 3,000 HZ
)
Received signals with standard 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
[
ANALOG OUTPUT]
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:
DB-25 PIN NUMBERING
7
0
–60 –100 –110 –120 (dBm)–70 –80 –90
0.5
1.0
1.5
2.0
2.5
DC V
Input Signal Level
R
S
S
I
O
u
t
p
u
t
V
o
l
t
a
g
e
Pin 9: COAX. SW
[
LOGIC OUTPUT
(
ACTIVE LOW
)]
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 sig-
nal remains open (high impedance) at all time.
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