[time-nuts] Adjusting HP 5065A frequency

Sun Oct 21 22:09:45 UTC 2012

Anybody in the middle of the country (Kansas City) have a maser or 5065a?  I want to test my super-charged gpsdo but don't have the tools.

Doc
KX0O

Sent from my iPad

On Oct 21, 2012, at 11:43 AM, EWKehren at aol.com wrote:

> John
> I agree with your observations. Before my time nuts time I did make the  
> mistake of getting rid of my 5065A since I did have a Shera disciplined FRK 
> and  had gotten hold of quite a few HP5061A's and FTS 4000's. Big mistake. 
> Gave no  attention to A/V. Phase noise yes but I went about it by focusing on a 
> low noise  100 MHz XO PLL as part of low noise signal generators, my key 
> interest.
> Recently how ever I was given a 5065A RVFR and thanks to Corby I know its  
> performance and I am combining it with later technology, M1000, temperature  
> control and a modified Shera, hoping for some outstanding results. If you 
> are  interested contact me off list and I send you some pictures. Will take 
> some time  to complete because of some other time nuts projects one of which 
> I hope Corby  will report on. 
> Bert Kehren
> 
> 
> In a message dated 10/21/2012 11:58:56 A.M. Eastern Daylight Time,  
> jra at febo.com writes:
> 
> Hi  Edgardo --
> 
> One slightly frustrating thing about the 5065A is that its  frequency 
> settability isn't as good as its short term stability.  I  believe the manual 
> says that the small divisions on the C-field counter dial  are 2x10e12, and 
> it's hard to set closer than that.
> 
> A good 5065A is a  remarkable piece of gear, with medium term stability 
> over, say, 1K to 100K  seconds that is very hard to beat by anything other than 
> a maser.  As  best I can measure mine against a number of other sources (no 
> maser here,  sigh), it is around 1e13, maybe a bit better, over that range. 
> That's an  order of magnitude better than any of the telco Rbs.
> 
> This is just a  guess, but from some data that tvb and others have 
> reported, I suspect that  external tempco is the main limiter for medium term 
> stability in the  5065A.  It would be interesting to see one in a 
> temperature-controlled  environment vs. one that's not.
> 
> John
> 
> On Oct 21, 2012, at 11:11  AM, Edgardo Molina <xe1xus at amsat.org> wrote:
> 
>> Dear  Corby,
>> 
>> Good morning. Thank you for the detailed instructions  to bring the 5065A 
> close to desired frequency. I couldn't have a cleaner  explanation of the 
> process. 
>> 
>> Yesterday evening I tried  adjusting the C field in small steps using a 
> mixer, lpf and two oscillators  setup as my current frequency counter is not 
> able to resolve de small  increments/decrements of frequency adjustment. 
> Still I could detect the  adjustments as I performed them. The response is 
> quite fast. I have been told  that these units are really stable compared to the 
> small telecom Rb units. I  heard a comment that the 5065A is even more 
> stable than the new Symmetricom  units using the X72 Rb module. Have you ever 
> measured such differences in  stability?
>> 
>> Thank you.
>> 
>> Regards,
>> 
>> 
>> 
>> 
>> Edgardo Molina
>> Dirección  IPTEL
>> 
>> www.iptel.net.mx
>> 
>> T : 55 55  55202444
>> M : 04455 20501854
>> 
>> Piensa en Bits SA de  CV
>> 
>> 
>> 
>> Información anexa:
>> 
>> 
>> 
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>> 
>> On Oct 19, 2012, at 5:55 PM, cdelect at juno.com  wrote:
>> 
>>> Edgardo,
>>> 
>>> You do use the  C-field adjust to put a 5065A "On frequency". The Factory
>>> values  are a moot point after all these years!
>>> 
>>> Just  incrementaly adjust the c-field control in small steps while
>>> observing the frequency comparison. 
>>> 
>>> The only thing  that might happen is that you reach one end of the 
> C-field
>>> pot  before getting to the frequency you want.
>>> 
>>> If that is  the case you will need to set the synthesizer switch to the
>>> next  value in the chart. (either up or down depending on which way you
>>> ran out of room.)
>>> 
>>> Then start over with the c=field  adjustment.
>>> 
>>> If you switch the synthesizer setting you  will need to remove power
>>> momentarily to reset the synthesizers  lock indication circuit. Otherwise
>>> pushing the logic reset button  to get the green light wont work.
>>> 
>>> Corby
>>> ____________________________________________________________
>>> Woman  is 53 But Looks 25
>>> Mom reveals 1 simple wrinkle trick that has  angered doctors...
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