[Elecraft] K3 & DM 780

[Don Wilhelm]

  Don,

Listen to the output of your soundcard with headphones (or your computer 
speakers) while "sending" with PSK31 - if you hear the PSK31 "warble", 
then your soundcard output is normal (you will likely only hear it in 
the left ear).  Please verify this before anything else - if the 
soundcard does not output the tones on the left channel, things will not 
work.

Use VOX initially just to keep things simplfied - others have suggested 
VOX settings.  For the time being, turn off PTT -- KEY in both the K3 
and DM780.  Actually, using HRD/DM780, it is best to key the transmitter 
through the RS-232 port than to use the DTR or RTS signaling (DM780 
activates transmit through HRD - but HRD must be configured to activate 
transmit too).  If you use DTR or RTS, those lines will become active 
for a short period when you power the computer on, and will signal to K3 
to go to transmit mode.

Put the K3 into TX Test and verify that the ALC meter goes up to 4 bars 
with flickering of the 5th bar.  Adjust the Line-in level or the 
soundcard output level to produce that amount on the ALC meter.  A word 
about the K3 "ALC" meter - it does not indicate ALC until the 5th bar - 
the lower levels are more like a VU meter to allow you to set the audio 
level below that of the onset of ALC,

73,
Don W3FPR

On 12/31/2010 4:27 PM, goldtr8 at charter.net wrote:
> I want to use DM 780 with my K3 to work either CW or one of the data
> modes.
>
> I can get the DM 780 to decode signals, but if I try to TX, I am unable
> to trigger the radio to do anything.
>
> I have both a USB to serial connection, plus the sound card from the
> laptop connected.  I have been reading the manual and a starter guide
> someone sent me, but I am getting nowhere fast.  I did try different
> settings for the PPT--KEY under the config menu, and I did get a solid
> tone out of the monitor speakers but no TX.
>
> If someone can point me to a resource on the intranet, I will glady do
> some more reading.
>
> Thx  Happy New Year
> Don
> KD8NNU
>
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