[time-nuts] LPRO101 orientation vs lock

[k6rtm at comcast.net]

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