[Elecraft] K3-JT65

[Jim Brown]

On 1/1/2013 3:44 PM, George Rebong wrote:
> I want to try JT65 on my K3. I have the E-MU0204 soundcard and it doesn't decode and my radio doesn't Xmit.
> May be my setting is wrong. Any tip's how to set up JT-65.

First, I strongly suggest that you use JT65-HF for any JT65 except 
moonbounce.  Far more user friendly than WSJT, and it has a 
multi-decoder. In the setup screen, make sure that you've selected the 
EMU card.

By all means use the auto-synchronization option in the JT65-HF setup, 
and give it a few minutes to stabilize once you've started the program.  
You can tell that it's out of sync if the lines in the waterfall slant a 
bit rather than going straight.  It is also sometimes necessary to stop 
and re-start JT65-HF a few times.

Make sure that your computer clock is accurate to within a second or 
two.  There are several good free time synch programs around. I use 
NetTime, which is on the same distribution server as JT65-HF. It can run 
in the background and re-synch at whatever interval you choose.

Make sure that signal levels coming into the sound card, and from the 
sound card to JT65-HF, are good.  You will get the best decoding of weak 
signals if you're hitting the sound card as hard as you can WITHOUT it 
hitting clip on strong signals.  You set this either with the output 
level of the radio or the input gain of the sound card. Once you have 
that set, use the horizontal slider in JT65-HF to set the signal level 
(a horizontal bar by the slider) to 0dB on band noise with no signal.  
Sometimes VERY strong signals will cause the level to go above 10-12 dB 
during a receive cycle, and JT65-HF will stop decoding. This is easy to 
fix -- just turn down the RF gain or reduce the level using the 
horizontal slider.

And, of course, RTFM, both for the K3 and JT65-HF.

73, Jim K9YC