[Elecraft] DM 780 and K3

[Bob Cunnings]

Have you tried a VOX gain of 100? It takes a setting greater than 50
to work with my setup.

Bob NW8L

On Sun, Aug 10, 2008 at 11:18 AM, Jim Stafford <w4qo at amsat.org> wrote:
> 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
>
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