> According to N1AL, here are 468 active FFT bins. It's a little more complicated than that. The FFT is actually 1024 points. The digital filter rolls off the edges, so the outer 20% of the points are thrown away. The remaining 800 or so are then interpolated to obtain the 468 display points.
I think we'll probably go with a 2048-point FFT for the external display to take advantage of the additional resolution. Alan N1AL On Sun, 2011-05-15 at 08:25 -0700, Jim Brown wrote: > On 5/15/2011 12:44 AM, Ian White GM3SEK wrote: > > I came to the P3 from an SDR-IQ using a 15in second monitor [1], linked > > to the K3 and N1MMLogger through LP-Bridge. For the moment, the much > > tighter integration between the P3 and the K3 (particularly the tracking > > cursors on*both* VFOs) overrides the need to peer at a small screen > > that is lacking in detail. > > Before going too far down the trail about lacking detail, it's important > to realize that resolution is also limited by the FFT parameters used > to process the complex IF signal and convert it to the frequency > display. According to N1AL, here are 468 active FFT bins. I haven't > seen numbers for the frequency and time resolution of the FFT process, > but the upper limit of frequency resolution is (F2-F1)/468. > > FWIW, I'm quite happy with the P3 display, and only wish it were smaller > (that is, less depth front to rear) with a swiveling bracket to mount it > to the underside of a shelf above my rig. > > 73, Jim K9YC > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
