[Elecraft] K2 Filter Alignment

[Jim Brown]

On 12/22/2025 10:00 AM, Bruce Beford via Elecraft wrote:
> I strongly suggest you learn to do the alignment yourself. It's not difficult. You will gain knowledge and experience, and appreciate the radio that much more.

I owned and used a K2 that I bought used, and carefully did the SSB 
filter alignment using Spectrogram. The results were not wonderful, 
thanks to the extreme phase shift of the stagger-tuned filters, which 
made speech hard to copy. The radio only sounds good on receive at full 
bandwidth, which uses the transmit filter.

It's a very nice CW rig, but NOT great on SSB except at full RX 
bandwidth. It's the nature of the design, which started out as a QRP CW 
rig, and morphed into much more. But the SSB part of the morphing didn't 
turn out all that great.

If you want to attempt the alignment, the last version of Spectrogram is 
on my website, k9yc.com/publish.htm  But it's GIGO -- garbage in, 
garbage out.

73, Jim K9YC