[Premium-Rx] bandscope frequency conversion question

[Jack Smith]

You might find my article on  the Z90 digital panadapter of some 
interest, as it discusses span versus resolution and sweep time. A copy 
is available at the ARRL's QEX site.
http://www.arrl.org/qex/2007/03/smith.pdf.

You might also find some useful things if you poke around my web site a 
bit. www.cliftonlaboratories.com. It shows some typical spectrum 
displays of different modulation types among many other things.


Jack K8ZOA

H. L. wrote:
> Just discovered the premium-RX group and am enjoying the archive very, 
> very much.  Quick question. Has a circuit been published for an 
> outboard mixer/oscillator that will convert a premium receiver's 455 
> kHz IF output to 21.4 MHz for connecting to a WJ (or other) panoramic 
> bandscope spectrum analyzer. I understand that the display frequency 
> range will be highly limited (or compressed) and that a lower quality 
> Heathkit SB620 bandscope will give a better, higher resolution display 
> than an expensive WJ scope because it is designed for a 455 kHz 
> input.  I don't understand the mathematics of this issue and would 
> appreciate an article reference if available.  Regards, Hal, KK6HY 
> (main premium receiver: Stoddart NM-26T -- with a 455 kHz IF output 
> jack). My Stoddart radio history website: 
> http://online.sfsu.edu/~hl/src.html
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