Vertex Standard VX-4500 Series, Руководство по обслуживанию

Страница: 3 / 45

3
VX-4500/-4600 Series VHF FM Transceiver Service Manual
DSUB 15-pin Accessory Connector
Pin 1: AF IN
(
A
NALOG
I
NPUT
)
External Microphone Input. Nominal input level is
4 mV (or -10 dBm; programmed via the CE115 pro-
grammer) at 600-ohm.
Pin 2: AF OUT
(
A
NALOG
O
UTPUT
)
Low-level receiver output. Peak signal level is -10 dBm
at 600-ohm.
Pin 3: AF GND
Ground for all logic levels and power supply return.
Pin 4: DC OUT
(
13.6 V DC O
UTPUT
)
Switched 13.6V output for supplying power to an ac-
cessory.
Maximum output current is 1 A.
Pin 5: RSSI
(
A
NALOG
O
UTPUT
)
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 gererated by the receiver IF sub-system and
bufferd by an internal op-amp. Typical output volt-
ages are 1 V (@No Signal Input) through 2.5 V (@50 dB
Signal Input).
Pin 6: EXT PTT
Shorting this port to ground causes the transceiver to
be placed in the Transmit mode, while opening the
connection to this port returns the transceiver to the
Receive mode. Opening voltage is 5 V, closed current
approx. 5 mA.
Pin 7: TRX
This port is intended for controlling an external TX/
RX switching circuit. When the transceiver is placed
in the Receiver mode, this port is 5 V. When the trans-
ceiver is placed in the Transmit mode, this port reduce
to 0 V.
This port is open drain output which can sink approx.
50 mA when active.
Pin 8: ING
(
I
GNITION
S
ENSE FEATURE
)
The VX-4500/-4600 may be automatically be switched
to the STND-BY mode when the vehicle's ignition key
is turned on. Maximum current is 20 mA.
Pin 9 - 12: ACC1 - ACC4 ( A
CCESSORY
P
ORT
)
These output port features can be programmed via the
CE115 programmer. Each port is open drain output
which can sink approx. 50 mA when active.
Pin 13: Not Used
Pin 14: Not Used
Pin 15: GND
Chassis ground