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Re: WG: Mysterious box:

Dave Brown
 

Tks John
You're quite right , of course.- I actually want info on the 2650A for making up a 'modern equivalent' for phaselocking an older klystron generator- the 620B, which covers 10 GHz OK. But in parallel I'm also looking for info re the 8709 to see how I could use the 8690 (plus PI that covers 10GHz) as well. What ever I get first may make the other requirement redundant- will have to wait and see. For whatever reason I telescoped the two requirements--it's been a month or two since I last thought about either.
I think the 8690/8709 combo used special PIs that had factory mods done to interface to the BWO sweep cctry- I need to find out more on that aspect too.

I'm also looking for one or (maybe) two 5255A 12 GHz counter plugins. Both the EIP microwave counters I have don't have GPIB and I need a pair of counters with logging capability that I can use up around 10 GHz.
With a couple of 5245s on hand (and also in regular use!) I can use the BCD outputs to do the logging-but need the 5255As for the frequency coverage.

Meantime - how many pages has the 2650A handbook and are there any large foldouts? I can handle A4 scanning no problem-those large multi-page foldouts can present issues though.

Cheers
DaveB, Christchurch, NZ

----- Original Message -----
From: "John Day" <johnday@...>
To: <hp_agilent_equipment@...>
Sent: Friday, January 19, 2007 3:16 PM
Subject: Re: [hp_agilent_equipment] WG: Mysterious box:


At 07:56 PM 1/18/2007, Dave Brown wrote:
DaveB, NZ (Still after a 2650A synchroniser h'book or even the real
thing! - or anything to help get the 8690 + PI phaselocked around
10GHz)
Dave, my boy. I never realised you needed a handbook for a 2650A, I
have the very thing, right here in front of me. It is 1964 printing
with the modification data to use various other mixers. The 934A is
the basic harmonic mixer used in these things (same as used in the
540A transfer oscillator as it happens).

But I am not sure that a DY-2650A is the right thing, they were
intended for klystron oscillators, such as the 614, 616, 618, 620 and
the 8614, 8616 units. These were all reflex klystron based. The
DY-2650A takes the reflector voltage (2kV in the standard unit or up
to 3kV with modification M18) and outputs the reflector voltage with
error correction.

The Carcinotron (Backward Wave Oscillator) in the 8690's has
different characteristics. They have an external FM input which is
fairly consistently 6% of band deviation per volt of input (as I
recall). I suspect you would be better off using an 8709 type
synchroniser rather than a DY-2650A. The 8709's (used with the 8620
series and 8350 series sweepers) had a switch selection of
sensitivity, again very much by recollection, and is pretty easy to
modify if need be for other characteristics. Sadly, I don't appear to
have the manuals for the 8709's any more.

The DY-2650A manual is available to a list member if they need it,
provided they agree to have it scanned and the PDF sent to me for uploading.

John




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