[time-nuts] LPRO101 orientation vs lock

[Bob Bownes]

If you find a good source for the prototype kits, by all means, let me
know. I've been gutting cheap/dead modules for the enclosures. A
project I've been considering is putting a T'bolt into one just to
send 1pps and 10mhz down the backplane.

BTW, there is a yahoo group for TM500/5000 series gear. Not much
traffic, but it is there.  http://tech.groups.yahoo.com/group/tek500/



On Thu, Sep 16, 2010 at 11:19 AM,  <k6rtm at comcast.net> wrote:
> Aha! Once again, Google is your friend --
>
> http://www.slack.com/images/TE/EfratomPTB-100.jpg
>
> shows the Efratom Rubidium module, and it's a double-width unit. That gives plenty of room to mount the module horizontally, and plenty of room above and below for fins and fans.
>
> When I get my time machine working, one of the things I want to go back and stock up on are Tek 5xx prototyping kits. The single-width kits are rare enough these days (and expensive), but the double-width ones are pure unobtanium!
>
> Bob K6RTM
>
> On Sep 16, 2010, at 2:51 AM, d.seiter at comcast.net wrote:
>
>> I got one of the ebay LPRO-101s about 6 months ago and played with it for a while, but had problems maintaining a lock. First of all, it has a heat sink bolted to the bottom that is just a little larger than the LPRO itself, including being about 1.25" thick( 1" fins). Typical frequency when locked is 10,000,000.007 on a 5360A clocked by a Z3801A.
>>
>>
>> Both then and now, it takes about 45 seconds to lock from cold, and will stay locked for about 45 minutes. I found that in the position with the heat sink on the bottom will stay locked the longest (up to a few days), but then it becomes intermittent. Other positions will lock for a while, but bottom down always works the longest.
>>
>>
>> For those of you who employed these in TM5xx or similar plugins, did you have lock issues? Is my unit just old?
>>
>>
>> Dave
>
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