Nterface, Acket, Vx-8r o – Vertex Standard VX-8R User Manual
Page 14
VX-8R O
PERATING
M
ANUAL
12
I
NTERFACE
OF
P
ACKET
TNC
S
The VX-8R may be used for Packet operation, using the optional CT-44 and CT-131
microphone adapter (available from your Yaesu dealer) for easy interconnection to com-
monly-available connectors wired to your TNC. You may also build your own cable using
a four-conductor miniature phone plug.
The audio level from the receiver to the TNC may be adjusted by rotating the DIAL knob
while pressing and holding the
key, as with voice operation. The input level to the
VX-8R from the TNC should be adjusted at the TNC side; the optimum input voltage is
approximately 5 mV at 2000 Ohms.
Be sure to turn the transceiver and TNC off before connecting the cables, to prevent volt-
age spikes from damaging your transceiver.
TNC
SP
GND
GND
2 k
Ω
10 F
µ
MIC
MIC
EAR
PTT
3.5
φ
φ
φ
φ
φ
Plug
2.5
φ
φ
φ
φ
φ
Plug
CT-44 Microphone Adapter
CT-131 Microphone Adapter