[Elecraft] K3 - Audio/IF filtering definitions

[Bill Frantz]

In addition to the SSB examples several people have posted, the 
Hi and Lo Cut controls are quite useful in soundcard digital 
modes. For example, when I use my computer for PSK, I scan the 
band with the bandwidth set to a low of 300 Hz and a high of 
2.6KHz. I have a macro to set this bandwith (IS 1450;BW0230;).

When I start a QSO, I narrow the Hi and Lo Cut controls to 
eliminate most of the other signals on my waterfall. The audio 
frequency marks on the computer's waterfall make this adjustment 
straight forward if a bit fiddly. The resulting bandwidth is 
between 50Hz and 150Hz and makes use of the 250Hz crystal filter 
in the K3. (Someday I have to reprogram the computer to send the 
narrow bandwidth details to the K3.) With this narrow bandwidth 
I find it easier to pull weak signals out of the noise floor and 
avoid overload from nearby strong signals.

Cheers - Bill, AE6JV



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