[Test-Equipment] Olders HP Spectrum Analyzers - The YIG?

[John Miles]

Nope; that's a circulator; I forget what its purpose in the instrument is.

The BWO is the large, black, highly-magnetized rectangular prism-shaped
object with the Watkins-Johnson label.  This is basically a travelling-wave
tube that's optimized for voltage-controlled oscillator service.

-- john KE5FX

-----Original Message-----
From: test-equipment-bounces at mailman.qth.net
[mailto:test-equipment-bounces at mailman.qth.net]On Behalf Of Greg Mijal
Sent: Saturday, January 29, 2005 3:46 PM
To: test-equipment at mailman.qth.net
Subject: [Test-Equipment] Olders HP Spectrum Analyzers - The YIG?


Hi:

I recently posted email about the older HP 8551B/851B spectrum analyzers.
The response was informative and helpful.  The consensus is that this is a
very robust machine.  I have decided to take a try at getting one of the
units going after I run a "drying out" process to the units.
Here's my question.  Someone mentioned that the YIG conversion was good for
the machine and I think I found what he was talking about.  Would you please
have a look at the pictures and confirm that that is what he was speaking
about. It is lower right in the photos. HV tubes removed for safe keeping.
http://home.earthlink.net/~bluebirdtele/yy.jpg
http://home.earthlink.net/~bluebirdtele/yx.jpg
Your thoughts are appreciated. Or should I say I am hanging on every word?

Greg
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