IC2E on packet
                   ==============

The IC2E can be used successfully on packet. This is how to achieve it.

TNC                             RIG
~~~                             ~~~
PTT-----------4.7K-------- TIP OF SMALL JACK

TX AUDIO------0.1MF------- TIP OF SMALL JACK

GROUND-------------------- BODY OF BOTH JACKS

RX AUDIO------------------ TIP OF LARGE JACK

This arrangement works with most TNC2 type clones, but it has not been tried on the PK88.

Another possibility would be to use a 1 to 1 audio isolating transformer.  This is a suggestion on how to connect it up:

RX AUDIO---------TIP OF LARGE JACK
GROUND-----------BODY OF LARGE JACK
GROUND-----------TRANSFORMER PRIMARY
TX AUDIO---------TRANSFORMER PRIMARY
PTT--------------TRANSFORMER SECONDARY
                 TRANSFORMER SECONDARY---------TIP OF SMALL JACK

When the PTT line goes low, it makes the Tx connection for the IC2E.

Julian G6LOH @ GB7BIL


                  IC2E on packet
                  ==============

Just another note about using the IC2 with TNCs.
On Kantronics TNCs this can be enabled by using an internal jumper.
No external cross-wiring of PTT and Audio is required.

On some IC2's (like mine) the value of the PTT pull-down resistor needs to be lower for reliable PTT operation. Try 3.3k instead of the 4.7k.

Also, don't forget that the IC2 is NOT intended for use off 12v, use a 9v reg to supply it or (especially on older models) you may lose the PA!

73 Paul G4BKI @ GB7BIL


PORTED AND REALIGNED FROM PC TO AMIGA FORMAT BY BOB G0LBQ - N6XDI.