[R-390] HP spectrum analyzer question

[kirklandb at sympatico.ca]

8560 series is a higher end spec A compared to the 8590 series.
Going back both hand green phosphorous screens. A common problem for both was the 
screen would fade/die. Hate to pay $500 - $2K for a analyzer and have the screen die.
Also, if someone left it on too long, the phosphorous would be burned in.

I would suggest making a simple one. You can fashion a power detector either with a diode or 
 go with one of the Analog Devices log power detectors, ie. like that used in the W7ZOI spectrum analyzer.

I wouldn't buy one unless you can really check it out. Attenuators could be shot.  I had an older model
 and the nylon gears had split (controlled the RBW, VBW, rates).

I confess, I have a R&S 28 GHz spect A that I use at 500 kHz. It is a 2 story unit and runs on DOS but
 was "free".

> To: r-390 at mailman.qth.net
> From: frankshughes at aim.com
> Date: Thu, 5 Aug 2010 18:34:12 -0400
> Subject: [R-390] HP spectrum analyzer question
> 
> Hi,
> I would like to obtain an HP spectrum analyzer to use on my R-390A and R-390, plus whatever other 
> ancient boatanchor devices come to my workbench in the future.
> Trouble is, unlike the choice for a generator (8640B), there are too many HP Spectrum analyzers
> on the E-place for me to pick from. 
> I can eliminate most just by the frequency spread, but am missing the knowledge and experience 
> as to which HP might be a relatively trouble-free design. 
> What do you like?
> 
> 73
> KJ4OLL
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