[Elecraft] K3 and PSK31 Data Mode and ESSB

[Jim Brown]

On Sun, 22 Mar 2009 19:15:39 -0700 (PDT), Bill Strong wrote:

>Plenty of QRN on the low bands especially in the summer. I meant the local
>man-made stuff.

I understand, and that was my point. Reducing the total bandwidth at the 
input of the sound card from 2.8 kHz to 200 Hz will make a signficant 
improvement in the signal to noise ratio. It won't matter on strong 
stations, but it can help a lot on weak stations. 

My QTH is fairly quiet too, but never dead quiet (unless the band is dead). 
A few nights ago, K6SRZ (about 80 miles N of me) spotted 4U1UN as "ESP on 
the West Coast" on 160M. He was ESP at my QTH too, with some QSB -- at 250 
Hz bandwidth. I screwed the IF down to 100 Hz and was able to copy him, just 
barely. I waited for his signal to peak, and worked him. This was CW, but 
the same laws of physics apply to PSK31. :) 

73,

Jim K9YC