http://www.zerobeat.net/mediawiki/index.php/SpotLight_on_K3 I have a new photo of K3 #272 on the K3 wiki including the finger dimple I got from www.FingerDimple.com. They are also sold by Elecraft for the K2 - same product. Other things I missed from stock K3 were analog S-meter and band stacking registers as implemented on (example Orion, IC746 IC756). I achieved these through the "Cool" program I wrote, also available on the K3 wiki. However the biggest positive I saw as a K3 improvement happened when I paid Elecraft for a DSP board upgrade last month. The stock DSP board for both K3 #272 and K3 #2308 would have one AF level when the AGC was OFF, and a muted level when AGC was set to AGC-F or AGC-S. That is to say that the stock version sounded like the receiver had the attenuator turned on anytime I was using the AGC-S or AGC-F. I could work around this somewhat by keeping the AGC off, or by setting the SLOPE and THRESHOLD at their lesser most values in the CONFIG. This produced a much better result on CW than (example) IC756Pro. But after I installed the new DSP board, AGC-F and AGC-S provide a satisfactory AF level, and when AGC is turned OFF, that is when the receiver sounds like I turned on the receiver RF attenuator. That is to say, the pattern is reversed. That is 100% more desirable here. Elecraft has suggested that the only difference in the upgrade DSP boards would be limited to AF frequency response, that is, more low end frequency available. But I am hearing these AGC differences. I'd like anyone interested to perform this test, and email your results to me directly. - K3 on 7.0 MHZ or another band that you have antenna for using widest crystal filter setting - AGC set AGC-S- Turn AF gain up very high - no signal in passband- Now turn off AGC Would like to know 1 - Your K3 serial number2. - If the AF increased or decreased. send to wb8yqj at yahoo dot com PLEASE do not clutter this email list with responses!!!!!! It does not seem to be firmware dependent in any way. TIA... Don...
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