[time-nuts] HP-5065a bought and finally working!

Edgardo Molina xe1xus at amsat.org
Fri Aug 24 20:10:21 UTC 2012

Dear Joe,

Thank you for your thoughts! The extra manual sheets will certainly be of a great help. I will come back to you regarding the serial number of the equipment and also the part number of the manual. I am still at the office. 

Following the multiple advises, I am ordering a Brooke Shera board to build my disciplining set for my 105B from the TB. I am surely having lots of fun with it.

Thank you again.


Edgardo Molina
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On Aug 22, 2012, at 7:22 AM, J. L. Trantham <jltran at att.net> wrote:

> Edgardo,
> Congrats on getting the 5065A up and operational.  Make sure the A11 Board
> (Temperature Controller) is all OK.  Failure there can destroy the A12 RVFR
> Assembly.  There is a lot of 'expertise' on the list for this unit.
> What is the serial number of your unit and what is the part number of the
> manual you have?
> I have a couple of manuals and I may also have the 'change sheets' that
> updates the manual to your serial number.  It may take me a while to chase
> that down but if I have the 'change sheets', I can scan them and send them
> to you.
> I have not heard of anyone 'disciplining' the 5065A by GPS, other than by
> hand from week to week.  However, the 105B has a built in connection on the
> back that is great for that purpose (negative slope, as I recall) and I have
> done that using a Brooks Shera controller board and the 1 PPS from my TBolt.
> It works quite well.
> Joe
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Edgardo Molina
> Sent: Wednesday, August 22, 2012 12:22 AM
> To: time-nuts at febo.com
> Subject: [time-nuts] HP-5065a bought and finally working!
> Dear Group,
> I wish you well.
> Do you recall a message and thread about a month ago with my concerns about
> buying a used / unknown condition HP-5065a rubidium frequency standard? I
> bit the bullet and bought it. Almost mint condition (cosmetically speaking)
> and with several operational issues. 
> Well, It took me several weeks to put it back to work. Several capacitors on
> several boards along with a couple of transistors and an IC were replaced.
> After that any being bored by the yellow light, it finally came off to allow
> a beautiful green lock condition light. I went through the necessary steps
> to tune it and calibrate it. Now, as I have been told recently. "You have
> been bitten by the Time Nuts bug." I am not complaining at all.
> Now the technical issues if you kindly allow:
> a. Does anybody have an HP-5065a manual for the latest versions? Mine (which
> I downloaded from the Internet) is intended for earlier versions. It seems I
> have one of the last produced units. I would kindly appreciate any help on
> this and I am willing to pay for time and expenses to anybody who could
> help. During the repair process I found several differences in the earlier
> versions design and had to figure out hoy mine works.
> b. Is it possible to build a GPSDRb? I would like to know if it is
> reasonable to pursue the goal to discipline the 5065a with a TB which I also
> got recently. 
> c. I am waiting for the delivery of a recent purchase. An HP-59309a Digital
> Clock to go with the HP 5065a. How I wish I could find the optional LED
> integrated optional clock and 1PPS output. Is my purchase a good match for
> the 5065a? Any other suggestions to drive a clock?
> d. I am waiting also for de delivery of an HP-105b mint condition quartz
> frequency standard. Would a second 59309a make sense to use it with this
> quartz standard? Or just saving it for a Cesium? Anybody willing to sell a
> spare, dust gathering, clean unit to me?
> e. Any suggestions for software of lab equipment to measure my experiments
> like AD, jitter, phase comparisons, etc?
> While I wait I am doing some experiments with a FE Rb standard to discipline
> an Adret synthesiser to output 32.768 KHz to directly drive a Nixie clock
> kit I just finished building.
> Your comments are surely welcome. Thank you!
> Kind regards,
> Edgardo Molina
> Mexico
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