[time-nuts] hp5065b !!!

EWKehren at aol.com EWKehren at aol.com
Wed May 1 22:16:26 UTC 2013


For the last two years some of us have ben knocking at the  door trying to 
get passive H Maser like performance, well Corby kicked it in.  More work is 
needed and it starts with the A3 module. I have spend hours  comparing old 
and new and I am sure many of the old variety are out there.  Nothing I can 
put my finger on and only some one that was there could most  likely give 
the answer. How ever for the last two years I have been looking at  the 
microwave signal generation and the recently posted paper confirms the  importance 
of that part of the circuit. This is one of several areas where the  group 
can make a contribution. What can be learned completing Corby's work may  be 
applicable like in modifying a FRK. Would be next on my list. So work on 
the  HP5065A can benefit other Rb's
Bert Kehren
 
 
In a message dated 5/1/2013 3:19:14 P.M. Eastern Daylight Time,  
bobdarby at triad.rr.com writes:

Adrian,

Thanks for the link.  The manual I had was  simply missing all details 
related to the A3 module but this is superb.  And yes, it would be nice 
to see the later  version.

Bert,

I'm sure most everyone would like to have the  level of performance 
demonstrated by the Corby  modified  5065's.  As Magnus has stated there 
is probably great interest on the  list but many of us can't contribute 
in any meaningful way.  Keep us  posted.

My question re the A3 module is related to the fact that an  upgrade 
there appears to be necessary to take advantage of Corby's  mod.  I don't 
know the numbers of early versus late A3  modules  but upgrades there may 
be necessary for many (or most?) owners to take  advantage of his work.  
Also, is a change to the later A3 module a  standalone improvement  or 
were there systematic upgrades throughout  the entire system to go with 
the newer A3 module?  Is it practical to  reverse engineer the later 
modules?

Regards,
Bob Darby

On  5/1/2013 8:41 AM, Adrian wrote:
> Bob,
>
> all of the manual  donloads appear to be the Nov. 1979 version only. 
> The A3 board is on  pages 8-22 ff.
> There is a high resolution 3 vol version scanned by  Brian Kirby KD4FN 
> standing out
>  http://www.kennethkuhn.com/hpmuseum/scans/
>
> Anyone has a later  manual version? I would much appreciate to get the 
> late A3 version  pages.
>
> I have to say that Corby's modification in its  simplicity and achieved 
> improvement is absolutely  ingenious.
>
> Adrian
>
>
> Robert Darby  schrieb:
>> I have a question for the list that I'm sure Corby can  address but 
>> perhaps someone else can explain as  well.
>>
>> Corby notes that this mod has only been  effective with late series A3 
>> modules.  My question is: what  change did HP make to the A3 module 
>> (early to late) that affects  the mod Corby is making? I do not own a 
>> 5065 and the the only  manual I have found on the web omits the pages 
>> related to the A3  multiplier so I'm not sure of it's exact function: 
>> I assume it  generates the phase modulated 6.8 GHz?
>>
>>  Thanks,
>> Bob Darby
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