[Elecraft] K3 and JT65-HF

[Don Wilhelm]

Chuck,

It is "almost" that simple.  If you have a desktop PC, is that simple, 
but you connect the K3 line out to the soundcard line-in and the K3 line 
in to the soundcard line out.  The levels should be within the range of 
adjustment using the K3 controls as well as the soundcard "volume 
cotrols" on the computer.

With a laptop, controlling the levels may be more complicated, and may 
require some resistive dividers to work properly.  For instance, the 
laptop headphone output may be greater than what is normally considered 
"line level" - although if the computer is expecting powered speakers, 
that one *may* be OK.  If you have a line out jack from the computer, 
use that instead of the headphone output.

Connecting the K3 line out to the laptop Mic In, may prove to be 
troublesome, although some laptops have a software setting that allows 
either line level or mic level using the same jacks - if that is your 
case, set it for line level.  If your computer is stuck with only mic 
level input, you may have to reduce the K3 line out signal level by 
about a factor of 10.  A 10k resistor in series with the K3 output line 
plus a 1k resistor on the computer side of the 10k resistor from the AF 
line to the AF return (usually the shield).  Place that voltage divider 
close to the computer end to keep noise pickup on that signal line to a 
minimum.

Remember that the audio input level to the K3 is adjusted differently 
than the traditional "wisdom" for other transceivers - use TX TEST to 
set your input level (no RF will be transmitted), use DATA A submode, 
and adjust the Line In level in the K3 (and/or the output volume and WAV 
level in the computer) so the ALC meter illuminates the 4th bar with the 
5th bar barely blinking.  The K3 ALC action does not begin until the 
audio level hits the 5th bar.

Good luck with your connections and with JT65.

73,
Don W3FPR

On 10/18/2011 2:21 PM, Charles Eklund wrote:
> I'm a new K3 user and love it. I'm also getting back into ham radio after 20+ years of little activity. So, all the new digital modes are new to me. I'm going to try JT65 and am trying to figure out the connections between my computer and the K3. Is it as simple as a connection from the earphones on my computer to the Line In on the K3 and the microphone on the computer to the Line Out on the K3?
>
> Thanks.
>
> Chuck, W0BBO
>
> Sent from my iPad
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