[time-nuts] Adjusting HP 5065A frequency

[Edgardo Molina]

Dear Tom,

Good evening. In relation to your last comments on this and other subjects, I am sharing some thoughts and experience about it. I took the liberty to separate the topics as to ease the interested parties to follow up accordingly. TNX.


a. Information you kindly provided and the index for newbies:

Thank you! You just provided me with lots of new ideas and information on the subject. You have very valuable information in your web site. As Hal was saying, an index should be done anywhere so it could be easier for the rest of us to locate the information. I am planning soon to build a web page for my lab. In english of course for everybody to share my experiences. I could work on an index to point out to the various sources of information and topics that are difficult to find. That I think could expedite things a little bit. 

b. Phase Micro steppers:

I saw the phase micro steppers working at CENAM time scale. I was wondering that the technique could be translated to my 5065As and not trying to touch them so often. If I am assuming correctly and the technique could be used with the HP Rb standards. Are those phase micro steppers easy to find? I mean, affordable in the second market? If there is one of course. I saw the ones used at CENAM are produced by SpectraDynamics in Colorado. According to Mike Lombardi it is a small highly specialized company with a small market to serve. I could translate it as "expensive and exotic"  : ) Am I correct?

c. Thunderbolt and my will to share initial experiences:

I am gathering a lot of information on the Thunderbolts as I am using them in my thesis work. I bought a couple of them. If my information or novice experience with these receivers is good for anybody, I would be more than glad to share it.

Thank you.

Kind regards,



Edgardo Molina
Dirección IPTEL

www.iptel.net.mx

T : 55 55 55202444
M : 04455 20501854

Piensa en Bits SA de CV



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On Oct 21, 2012, at 7:29 PM, "Tom Van Baak" <tvb at LeapSecond.com> wrote:

> Hi Edgardo,
> 
> What you'll find is that many labs do not periodically adjust the C-field of their 5061A or 5065A at all.
> 
> Instead, any phase or frequency adjustment is done with phase microsteppers or simply done in software with time and rate adjustments to the raw data. These methods avoid all possible physical side-effects of changing voltages, currents, and fields. It also makes it possible to gather long-term data to show how the standard is operating (if you make mechanical rate adjustments it complicates data that you have already collected).
> 
> The other point is that when making stability measurements, there is no requirement that the reference (e.g., 5065A) be perfectly on-frequency. So this removes motivation for physically touching and possibly perturbing the operation of the reference.
> 
> Please also take the time to read these pages.
> 
> "HP 5065A Rubidium C-Field Resolution"
> http://leapsecond.com/pages/hp-5065a-cfield/
> 
> "Rubidium Oscillator Stability"
> http://leapsecond.com/images/4rb.gif
> 
> "Stability and Noise Performance of Various Rubidium Standards"
> http://www.ke5fx.com/rb.htm
> 
> "Performance of Low-Cost Rubidium Standards"
> http://febo.com/pages/oscillators/rubes/
> 
> "A close look at a drifting HP 5065A Rubidium Frequency Standard"
> http://leapsecond.com/pages/doug-rb/
> 
> /tvb
> 
> 
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