[Elecraft] K3 APF

[Jim Brown]

On 11/14/2010 4:20 AM, Bill W4ZV wrote:
> I also suggested the background noise issue to Joe.

This makes sense to me, Bill.  It's the noise that excites the ringing, 
and the TRANSIENT waveform of the noise  is almost certain to affect the 
extent of the ringing.  I have VERY limited experience with the Beta (a 
few QSOs in CWSS with 4.17 and a few more during OK/OM this weekend with 
4.21). The waveform of the CW probably also matters -- there was a LOT 
of flutter on the OK/OM signals here in CA.  Some of those OK/OM signals 
were also quite weak, but I didn't find the APF any more useful than a 
narrow IF setting in pulling them out.

In general, I found the APF to be effective on some signals and a waste 
of time on others.  I also found it tricky to tune in, and thus not as 
effective in contest operation.

As to Joe's measurements -- I've done a LOT of measurements, and I'd 
call these two sets of data he posted a dead heat.

FWIW -- I loaded 4.21 Friday afternoon and ran a couple of hours in 
OK/OM on 20M Saturday morning and about 8 hours in JIDX SSB.After 
loading 4.21, I also used a new version of K3 Util to recal TX power.  
No issues with the Beta.

73, Jim K9YC