6
1
PANEL DESCRIPTION
1
r
ANTENNA CONNECTOR [ANT]
Connects a 50
Ω
antenna with a PL-259 connector and a
50
Ω
coaxial cable.
t
POWER RECEPTACLE [DC13.8V]
Accepts 13.8 V DC ±15% with the supplied DC power
cable.
NOTE: DO NOT
use a cigarette lighter socket as a
power source when operating in a vehicle. The plug
may cause voltage drops and ignition noise may be su-
perimposed onto transmit or receive audio.
D
DATA socket Pin assignment
q
DATA IN
Input terminal for data transmit.
See p. 100 for details on how to
toggle data speed between
1200 (AFSK) and 9600 bps
(G3RUH, GMSK).
w
GND
Common ground for DATA IN,
DATA OUT and AF OUT.
e
PTT P
PTT terminal for packet operation only. Connect ground to
transmit data.
r
RS232 OUT
Data out terminal for RS232 connection (GPS operation).
t
DATA OUT
Data out terminal for 9600 bps operation only.
y
AF OUT
Data out terminal for 1200 bps operation only.
u
RS232 IN
Input terminal for RS232 input.
i
P SQL
Becomes high (+5 V) when the transceiver receives a sig-
nal which opens the squelch.
• To avoid unnecessary TNC transmission, connect squelch to the
TNC to inhibit transmission when receiving signals.
• Keep audio output at a normal level, otherwise a “P SQL” signal
will not be output.
ANTENNA INFORMATION
For radio communications, the antenna is of critical impor-
tance, to maximize your output power and receiver sensi-
tivity. The transceiver accepts a 50
Ω
antenna and less
than 1:1.5 of Voltage Standing Wave Ratio (VSWR). High
SWR values not only may damage the transceiver but also
lead to TVI or BCI problems.
w
u
t
q
e
r
y
i
Rear panel view
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