Greetings.
I am no longer able to control my K3 (SN 7845)with my Dell Optiplex 740,
running Windows 7 or with my Dell Latitude D610, running Windows XP. The
arrangement used to work (running 4800 baud), but not now. I am using
the "real" serial port on each computer.
I've tried two different "straight through" serial cables that have
worked with the K3 and both Dells previously. Both cables show
continuity on all nine wires. Today I used both cables to connect my AIM
4170C analyzer to the Optiplex and everything appeared to work properly.
So, I think I've ruled out the serial cables. I have run the Optiplex's
device manager ragged, checking and rechecking the COM1 port many times.
I've tried updating the driver several times and have always gotten a
message that the most current driver is installed. I've also always
gotten a "the device is working properly" message.
I have tried all sorts of baud rate combinations (less than, equal to
and greater than 4800 baud) with the K3 and the Optiplex, always
starting my experiments with the same baud rate for COM1 and the K3 and
then either leaving the COM1 baud rate constant while varying the K3
baud rate or leaving the K3 baud rate constant while varying the COM1
baud rate. In every instance, all the K3 Utility gives me are scrolling
messages that say, "Attempting to contact K3 on port COM1 at 38400
bit/s", "Attempting to contact K3 on port COM1 at 19200 bit/s",
"Attempting to contact K3 on port COM1 at 9600 bit/s", "Attempting to
contact K3 on port COM1 at 4800 bit/s", etc.
I've pulled the top cover off the K3 and measured the voltage on pin 8
of U1 on the KIO3 board. I measured a little over -7 VDC, so that looks
okay, as per KE7X's book.
I sent the K3 to Elecraft a few months ago to fix a zapped toroid in the
directional coupler. The computer control worked before the zap.
Elecraft satisfactorily repaired the K3 and fully tested before it was
returned to me. As far as I can tell, none of my settings were changed
while the rig was at Elecraft. I've operated the K3 mobile, with no
computer control and it has worked like a champ. However, a few days
ago, when I connected it back up to Optiplex (and later the Latitude), I
became aware of the serial port problem.
I am at my (half) wit's end and have to believe I am overlooking
something obvious. Can anyone please suggest what, if anything, to try next?
Many thanks and 73.
Rene K5JX
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