Bulletin:   KA1050
Vendor:     Kantronics
Subject:    DCD / CARRIER DETECT ON HF IMPROVEMENTS

I noticed that the KAM, when connected or trying to connect, will start
to transmit on top of an other signal at times. This will happen when a
received signal appears just before the the KAM wants to transmit.
It is visible by looking at the mark/space display. After a quiet period
a received signal will light up the bargraph display and the KAM will
transmit on top of it.  This modification greatly improves the reception of
packet as well as prevent you from transmitting on top of another signal.

The best way to do this mod is by just soldering a 22k or 27k
resistor across R47. R47 is a 220k resistor. It might be a bit
difficult with out the right tools to remove the old R47. So
leave it in and just solder the new one across it on the other
side of the board.

The mod changes the time constant of the rc network formed by
C29 and R47. Which is part of the carrier detect function on hf.
Now that it operates faster, it will do a better job. You should
see a lot more stations while monitoring and have less retries
while connected or trying to connect.

de Nand VE3IWJ