[Elecraft] Monitor output...

[Alan Bloom]

> 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:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>