As relatively straightforward as WL has been to set up, I've been having
little luck with some of the hardware interfaces. This is a different CW
issue, one that's causing me to test my sanity. The archives show a
similar question asked a few months ago, but no reply. I'm using Win2K,
which may itself be the problem, dunno.
Here's the problem. I built a very simple interface to go from 9-pin COM1
to the CW key jack on the back of my IC-765 (the poster several months ago
also had an Icom rig). I basically took the interface for a 25 pin serial
interface found in the CT manual and modified it for 9-pin (DTR on in 4
instead of 20, and GND on pin 5 instead of 7). This worked fine before,
but now when I plug the key jack in the 765 transmits continuously. I've
had that happen with the old interface, turned out a couple of the wires
were shorting. But that's not happening here, since I took a multimeter to
it and everything appears to be fine.
This is the circuit description, anybody see anything wrong?
1. Using a 9-pin connector, I took a line from pin 4 (DTR), through a 1K
resistor into the base of a 2N2222 transistor.
2. Took a line from pin 5 (GND) to the 2N2222 emitter and on to the ground
of the key jack.
3. A line from the 2N2222 collector to the positive terminal of the CW key
jack.
Again, this has worked for me in the past with a 25 pin port; I'm
wondering if there's something basic I'm missing, or something going on
with Win2K and the Icom.
73, Joe KQ3F
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