Kenwood hand-helds (TR-2500, TR-2600, 215, etc)
DB-15
1
2
3
8
9
10
11
Connects
to
Microphone jack shell
Earphone jack tip
Microphone plug ring (3 pin connector - not the tip)
No connection
No connection
No connection
Earphone jack shell
Yaesu hand-helds (FI' 727, 470, etc)
These radios use the same connection as the ICOM hand-helds, but the
PI'T
keying
resistor
will
need to be changed. To perform this modification, install a 1.SK ohm
resistor in Rl3 on the DE1200 board.
This
is located just to the right of the J2 jumper.
DB-15
Connects
to
1
No connection
2
Earphone jack tip
3
Microphone jack tip
8
No connection
9
No connection
10
No connection
11
Earphone jack shell
Other hand-helds
Most other hand-held radios use a similar connection.
When jumper J2 is on the center pin and the pin marked NOR, the AFSK output from
the modem is connected to ground through a lOK ohm resistor. This
will
cause many
hand-held radios to key the transmitter. Moving the jumper to the center pin and HT,
will cause the resistor to be isolated from ground except when the Data Engine asserts
Push-To-Talk.
Our experience with hand-helds has indicated that the
PIT
resistor value is the only
change required for most hand-helds, and you can experiment by installing different
values in Rl3.
Watchdog Timer
The DE1200 modem
has
a watchdog timer built in to prevent your radio from
remaining in a transmit state for more than approximately 2-112 minutes.
If
you need
to disable the watchdog timer, place jumper J4 on both pins. Kantronics recommends
that the watchdog timer not be disabled.
e
Copyright 1990, Kantronics Co., Inc.
All
Rights Reserved.
Duplication of
this
manual without permiesion of
Kantronics Co., Inc. is prohibited.
7
DE1200 Modem
April 3,
1990
