[Test-Equipment] Old HP RF analyzers - are they worth it?

Fri Jan 28 20:42:10 EST 2005

Hi All

An article on fixing the 8551 IF has been published before--

Please see " A Replacement 2 GHz IF Strip for the HP8551
Spectrum Analyzer " by Jim Davey  WA8NLC---It was
printed in " Microwave Update -1994" published by ARRL
( ISN 0-87259-486-6 )

You can also find articles on the YIG conversion for the 8551 
in other  Microwave Updates  by ARRL -_Send me an email if you
need an exact location for the article......I was going to do it
until I got a newer 141T based system..

I had 2 of the 851/8551 analyzer in the past--Neat technology
for the day .I finally would up giving them to a new ham
when I needed the space in my very small shop

73   Ray    KE3QY
Chilly St. Paul, MN

++++++++++++++++++++++++=========================
In a message dated 05-01-28 14:29:43 EST, you write:

<< Subj:     Re: [Test-Equipment] Old HP RF analyzers - are they worth it?
 Date:  05-01-28 14:29:43 EST
 From:  tractorb at ihug.co.nz (Dave Brown)
 Sender:    test-equipment-bounces at mailman.qth.net
 To:    test-equipment at mailman.qth.net

 Tks John-yes, of course it can't be a nuvistor as it fits in that 
 cavity arrangement-it's been a few years! It should be a doddle to 
 replace it with a MMIC etc, as you suggest.

 Dave, ZL3FJ

 ----- Original Message ----- 
 From: "John Miles" <jmiles at pop.net>
 To: <test-equipment at mailman.qth.net>
 Sent: Saturday, January 29, 2005 7:42 AM
 Subject: RE: [Test-Equipment] Old HP RF analyzers - are they worth it?

 >
 >> I think there's a nuvistor in the 2 Ghz IF amp that can be a dog to
 >> get if it's in need of replacing. Used to have a spare set of
 >> handbooks round here but no idea where they are at the 
 >> moment-filing
 >> system is in chaos as I add yet another cabinet and re-arrange all 
 >> the
 >> 'overflow'.
 >
 > It's actually not a Nuvistor, but a planar triode.  I seem to recall 
 > 6239
 > being the type number.  They're pricy -- I've seen them quoted at >
 > $200.00 -- but I can't imagine any reason why a $2.00 MMIC couldn't 
 > do the
 > job, perhaps with a homebrew 2 GHz bandpass filter.
 >
 > -- john KE5FX
 >
 > _______________________________________________
 > Test-Equipment mailing list
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 >
 >
 > -- 
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 > Checked by AVG Anti-Virus.
 > Version: 7.0.300 / Virus Database: 265.7.2 - Release Date: 
 > 21/01/2005
 >
 > 

 -- 
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 Checked by AVG Anti-Virus.
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