[time-nuts] time-nuts Digest, Vol 127, Issue 26

brucekareen at aol.com brucekareen at aol.com
Sun Feb 22 19:09:09 UTC 2015


Jurg,

There is a tantalum capacitor on the lamp board.  When it fails it can corrode the board.  I have had this happen.  You can likely replace the tantalum capacitor and repair the foil connections.

An issue with the PRS-10 units is that the factory has implanted settings for the specific unit in its firmware.  They do not give customers access to the commands to alter these settings.  Swapping boards likely has programmed the wrong bias and operating settings into the lamp driving FET.

Bruce, KG6OJI

 

 

 

-----Original Message-----
From: time-nuts-request <time-nuts-request at febo.com>
To: time-nuts <time-nuts at febo.com>
Sent: Sun, Feb 22, 2015 9:05 am
Subject: time-nuts Digest, Vol 127, Issue 26


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Today's Topics:

   1. Re: OXCO insulation (Andrea Baldoni)
   2. PRS10 Rubidium (Jürg Kögel)


----------------------------------------------------------------------

Message: 1
Date: Sun, 22 Feb 2015 10:44:24 +0100
From: Andrea Baldoni <erm1eaae7 at ermione.com>
To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] OXCO insulation
Message-ID: <20150222094424.GA31822 at sol.ermione.com>
Content-Type: text/plain; charset=us-ascii

On Sat, Feb 21, 2015 at 06:09:42PM -0600, Dave M wrote:

> What kind of foam insulation is generally used inside an OXCO?  Do all 
> manufacturers use the same kind?  Is it available in small (hobbyist) 
> amounts?

In the only one kind I opened, Milliren DOCXO, the insulation was air.

Best regards,
Andrea Baldoni


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Message: 2
Date: Sun, 22 Feb 2015 16:44:06 +0100
From: Jürg Kögel <j.koegel5 at gmail.com>
To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: [time-nuts] PRS10 Rubidium
Message-ID:
	<CALi71odkgaWCpwiesnm5dr21wZ4ZNsSNCPGUinbp1se88Yg-ow at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Fellow time nuts. I have two SRS PRS10 Rb’s that I did purchase 10 years
ago. Both have been working for the last nine years. One did fail last year
and I finally got around to looking at it in the last two weeks. The
attached picture shows the trauma to the lamp board. I do not understand
the corrosion since it has been in a very controlled environment in my
basement.

Since the failed unit does have the 1 pps loop control I moved the
processor board to the still working unit. Did not work. Does it take more
than just moving that one board to get 1 pps loop control?

Second any ideas as to what may have happened to the lamp heater board. Any
recommendations? Plan on making a replacement board. Have a power FET MRF134

Thanks



 Juerg
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