HI Jerry,
Glad to hear the new filter controls are working well for you. I went back
to a stock 1.3.5 and saw the same weirdness on WWV and apparent frequency
shift with small filter bandwidths as I do with my modified 1.3.5. I think
the apparent shift is some sort of an artifact of the spectrum display when
you've got a 50 hz filter set. It looks like the display only has a
resolution of 12 hz or so (look at where the corners in the line are) so,
if the actual peak is between those 12 hz points it may look shifted. I
think for that small a display we're sort of under
sampling the actual power density with a 12 hz resolution.
BTW - I did find (and fix) the DSB bug you mentioned (at least I think I
did!).
Thanks for trying out the code.
Regards,
Bill (kd5tfd)
At 07:52 AM 5/30/2005, Jerald Jones wrote:
Bill,
The new items in the latest update make the filter operation real
smooth. Keep up the good work. I still get a 6 hetz shift of the
spectrum display when useing WWV with some filter widths, however this
may not be your code. It seems to show up when useing the fixed width
buttons too. When I am checking WWV, the 100 hertz width is ok, the 50
hertz width is shifted and the 25 hertz is ok. When useing variable
width I can get the 6 hertz shift of the spectrum display by manually
setting the hi and lo cut frequencies or by moving the slider to certain
positions or through the use of the +W and -W buttons. By the way, the
6 hertz shift shows up on the digital strongest signal frequency read out
below the spectrum display too. This problem is minor, it would not
bother most normal operation.
Jerry WK0J
PS I have not went back to look at the prior SDR versions to see if any
sign of this problem is present prior to your prgramming.
