FT-250R O
PERATING
M
ANUAL
30
The
FT-250R
may be used for Packet operation, using the optional
CT-44
microphone
adapter (available from your Yaesu dealer) for easy interconnection to commonly-avail-
able connectors wired to your TNC. You may also build your own cable using a four-
conductor miniature phone plug, per the diagram below.
The audio level from the receiver to
the TNC may be adjusted by using the
VOL
knob, as with voice operation.
The input level to the
FT-250R
from
the TNC should be adjusted at the
TNC side; the optimum input voltage
is approximately 5 mV at 2 k-Ohms.
Be sure to turn the transceiver and
TNC off before connecting the cables,
so as to prevent voltage spikes from
possibly damaging your transceiver.
Also, be certain to turn off the Receiver Battery Saver, if activated (see page 10).
M
ICROPROCESSOR
R
ESETTING
In the event that erratic, unpredictable transceiver operation is encountered, it is possible
that the microprocessor has sustained a static burst or other condition that has caused
corruption of some of its data. If this should happen, resetting of the microprocessor should
clear up the problem. Here is the procedure for resetting the microprocessor (this will
restore all factory defaults, and will erase all memories):
c
Turn the radio off.
d
Press and hold the
PTT
and
LAMP
key while turning the radio on.
e
Rotate the
DIAL
to select “
ALL.RST
ALL.RST
ALL.RST
ALL.RST
ALL.RST
” on the LCD.
f
Press the [
F/L
] key momentarily to initialize the radio.
S
ET
M
ODE
R
ESETTING
This “Reset” procedure restores the Menu (“Set mode”) settins to their factory defaults,
without affecting your regular memories.
c
Turn the radio off.
d
Press and hold the
PTT
and
LAMP
key while turning the radio on.
e
Rotate the
DIAL
to select “
SET.RST
SET.RST
SET.RST
SET.RST
SET.RST
” on the LCD.
f
Press the [
F/L
] key momentarily to initialize the Set mode.
Interface of Packet TNCs & Reset
EAR
MIC
SP
GND
MIC
PTT
GND
TNC
2 K
Ω
10
μ
F
