[Elecraft] DM 780 and K3

[Jim Stafford]

Ok, I think 24 hours and searching every last manual, option, etc in
both the HRD - DM780 and K3 is long enough before asking for help!  That
said, I will probably find the solution about 5 minutes after hitting
the SEND button on this message.

I have done PSK31 with other rigs and have gotten some results with the
K3 (no contacts but it appeared to send the characters) but that was 
using the
BPSK31 setting in the K3.  I want to use the DATA A mode which I think I
should be using with the external sound card in my computer.  Everything
seems to be connected - DM780 is working with HRD, etc.  I see data
streams and all is receiving ok.  I load the buffer and it seems to send
ok. In fact the transmit light on the K3 lights up but nothing gets
sent.  It is NOT in the TX TEST mode but it acts that way.  The stream
gets sent but no power out.  I can't seem to get the VOX to work and the
PTT is some sort of "VIA Ham Radio Deluxe" method.  I thought I could
use the DTR or RTS method but even though I have the PTT set to that in
the K3 and DM780, nothing happens on that method except DM780 does seem
to be sending the data.  That method doesn't even put the K3 into the TX
mode.  All my wires are connected correctly and I "print" stations fine. 
  The transmitted signal in the waterfall appears to have data on it, ie 
when the characters are finished, there is a "steady" out put with no 
modulation.

I've run thru HRD's forums, this reflector, the Yahoo Group, and googled
the web.  Nothing.

Here are my K3 settings:

VOX ON
VOX GN 50
AntiVOX 0
PTT - KEY   RTS-OFF or any combination (tried'em all)
MIC BTN OFF (but ON does not work either)
MIC + LIN   ON
MIC SEL RPL (rear panel)

on DM-780

Connected to HRD
I have a TX button set but it only puts the rig into the TX mode (no
power out)
PTT - none of the 3 options work

Shouldn't the cable I'm using between HRD and rig work to put PTT on the
line? And why won't VOX work?  I've used both methods on other radios
with various interfaces.

I'd think I have a bad serial cable but a friend has tried all the same
options in sync with me and neither get anything out UNLESS we put the
K3 into the PSK31 mode and not DATA A.  There seems to be a lot more
flexibility in DATA A with respect to filter and shifting than in PSK31.

Ok, I'll be back in about 5 minutes with the answer.  IT always seems to
work that way.

73, jim/w4qo