[Elecraft] CW Decode and Preamp?

[na5n at zianet.com]

Gwen Patton writes:

> I do try to have the decode around 3 or 4, but code that'll decode with the preamp off doesn't even make the CWT bar flicker with it on.

I copy code in my head but have played with the CW decoder on my KX2 for  
amusement and also at our FD station so the others could see what was being  
sent and received.  A couple were interested in learning the code.  One  
fella brought an MFJ CW reader.  We could not get a "solid copy" on either  
of them except on very strong signals.  With typical band conditions and  
even sorta weak QRP stations, I can get maybe 80% copy - not bad, but not  
100% copy.  I've also found the threshold around 3-5 to be the best, like  
you, though does tend to change from station to station and day-to-day  
depending upon band conditions.

> So there's more at work here than signal strength.

The advice on better copy without excessive RF gain is valid.  However, you  
do need that extra gain to properly drive the CWT and decoder on most  
signals, as you noted, even if the signal-to-noise ratio is compromised.   
Tuning and filtering is also important.  I usually set my CW filter at  
25-30Hz for best decode and push the button that sets the VFO to the proper  
offset to center the CWT ... then tweak the VFO just a bit for best  
decode.  Lastly, I have found the decode to work better at 18-20 wpm or  
higher; slower code speeds is prone to triggering on noise.  I would  
recommend tuning where there are no signals - just noise - and set things  
for no false decode from the noise, then tune to the station you want to  
decode.

Hope the above helps.  The decoder can be a good tool for helping you learn  
the code, just realizing you will seldom achieve 100% copy on the decoder  
(and sometimes even by ear!).  I admire you for your desire to learn the  
code.  It takes a lot of nerve to get on the air for those first few QSOs.   
We all remember our first QSOs.  And as we'll all tell you, the best way to  
improve your CW is to get on the air.  Most CW ops are more than willing to  
match your code speed (except in a contest maybe) to give you an enjoyable  
QSO and help you along.

Sorry for the long reply, but hopefully helpful to you and some others.

72, Paul NA5N

PS - email me if you'd like to arrange a sked on the air.  Will use my  
straight key and any speed is fine.