[Elecraft] K3 pitch change with filter selection

[Bill Frantz]

With PSK31, 3 Hz is a significant shift. I have not really 
noticed a shift of that magnitude as I move from wide-bandwidth 
-- 300 to 2600 Hz -- which gives me a full waterfall with no 
edge falloff, down to 50 Hz wide at the audio frequency shown on 
the waterfall. Narrowing the bandwidth thru this range starts 
with the 2.7K filter and moves thru the 2.1K and the 250 Hz filters.

My software will allow .1 Hz adjustments for the decoder. I 
mostly adjust using 1 Hz shifts, but sometimes I use finer shifts.

Cheers - Bill

On 10/9/13 at 6:58 AM, alsopb at nc.rr.com (Brian Alsop) wrote:

>Keep in mind the following.  The AF pitch you will get for a 
>fixed frequency signal is a function of the filter.  The amount 
>of pitch shift between filters can be 3 Hz at times.  How the 
>decoder handles such a step function change in pitch, I don't know.

-----------------------------------------------------------------------
Bill Frantz        | Since the IBM Selectric, keyboards have gotten
408-356-8506       | steadily worse. Now we have touchscreen keyboards.
www.pwpconsult.com | Can we make something even worse?