[Premium-Rx] spectrum Analyzer to use as a signal monitor

[John Miles]

I'm still not sure I'm understanding the point, though.  Offhand, I'm not
sure what the max frame rate is on my 8566B, but it's well into real-time
territory (20-30 FPS).  This is limited by the selected RBW filter, rather
than the display proper.

The Tek 49x is quite a bit slower (MC6800-series CPU versus the 8566B's
MC68000... talk about an unfair fight, heh!).  But unlike the 8566B, you can
turn digital storage off altogether.

Max-hold is not ordinarily a feature you'd want to use in a panadaptor-type
application, unless you wanted to let the display accumulate transient
signals over time, and/or record best-case signal peaks.

Probably an FFT analyzer would give you the best real-time results.  You
wouldn't have to slow down the "sweep" to avoid smearing and attenuation in
an analog filter....

-- john KE5FX

>
> I think you misunderstood what I said.   The MAX HOLD feature on
> analyzers
> such as the Tek 492/494 and HP 85xx series holds the max for all
> successive
> sweeps until turned off.
>
> WHat I'm saying is that the sweep speeds are slower, and to
> compensate for
> that, the pixels stay static as the analyzer sweeps, then they of course
> reset when the analyzer starts the next sweep.  THis means "stop
> animation"
> displays rather than displays that smoothly change in concert with the
> signal's modulation.  No other way they could do it, really, given the
> overhead of digitizing the detector output, putting it into
> memory, etc. --
> I just find it annoying and prefer analog, fast swept displays.
>
> 73 John
>