Interface Of Packet Tncs; Reset - Yaesu FT-250R - ANNEXE 824 Manual

Interface of Packet TNCs & Reset
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).
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):
Turn the radio off.
Press and hold the PTT and LAMP key while turning the radio on.
Rotate the DIAL to select "ALL.RST
Press the [ F/L ] key momentarily to initialize the radio.
This "Reset" procedure restores the Menu ("Set mode") settins to their factory defaults,
without affecting your regular memories.
Turn the radio off.
Press and hold the PTT and LAMP key while turning the radio on.
Rotate the DIAL to select "SET.RST
Press the [ F/L ] key momentarily to initialize the Set mode.
30
M
ICROPROCESSOR
ALL.RST" on the LCD.
ALL.RST ALL.RST
ALL.RST
S M
ET ODE
SET.RST" on the LCD.
SET.RST SET.RST SET.RST
EAR
MIC
R
ESETTING
R
ESETTING
FT-250R O
TNC
SP
GND
10 μF
MIC
PTT
2 KΩ
GND
M
PERATING ANUAL