Hi Rb's die if you let them get to warm. If it's in a plugin sized enclosure count on a pretty good fan.
Bob On Sep 16, 2010, at 3:57 PM, [email protected] wrote: > > > Hi Bob- > > > > I don't have the LPRO in a plugin, but I had considered it, and was wondering > if any of those that had built one had thermal and/or lock issues. > > > > Re the sun in our valley... not this year! My tomatoes just started really > producing and my squash and zucchini still haven't even flowered. That has > NEVER happened to me before. A very odd year weather-wise! > > > > Dave > ----- Original Message ----- > From: [email protected] > To: [email protected] > Sent: Thursday, September 16, 2010 8:07:19 AM > Subject: Re: [time-nuts] LPRO101 orientation vs lock > > I assume you mean Tektronix TM5xx or 5xxx modules. > > I haven't seen an LPRO plugin, but considered doing one for my TM506 rack. My > conclusion was that I couldn't get rid of enough heat without cutting custom > fins for the LPRO. > > Recall that the physics package in the LPRO is the biggest source of heat, > and looking at the unit with the connector facing you and on the left, the > physics package is along the right side toward the rear of the unit. I > decided the way to mount the LPRO if I had to go vertical was with the > physics package closest to the top, to minimize the components that got > baked. (I welcome recalibration of this opinion from more knowledgeable > sources!) > > If I could cut fins for the new "top" edge, as well as a good plate for the > bottom, and some fans, i might be able to get rid of enough heat to make it > work. I considered mounting the LPRO to the rear of the module connectors, in > the area containing the linear power supply components. > > I reconsidered on recalling admonishments in the LPRO docs and on this list > that cesiums do not like magnetic fields! Mounting the unit next to large > power transformers wouldn't seem to be suck a good idea... > > You might have better luck running it in a TM5006 rack, as they have much > better cooling and airflow (a reason to get rid of that 506 and pick up a > 5006!). > > I've had good results with my LPRO mounted on a half inch plate of T6061 > aluminum and an old AMD heatsink+fan mounted above the physics package, held > in place with arctic silver heat transfer compound and spring-loaded wire > clips going to the plate. I've been meaning to run noise studies to see if > the fan causes any problems (vis a vis mag fields). > > Since I expect to be using the LPRO only occasionally, I've been trying to > talk my son into making me a steampunk-themed case, something like rosewood > with brass corners and detailing... > > Cheers and 73 -- Bob K6RTM in sunny silicon valley > > > On Sep 16, 2010, at 2:51 AM, [email protected] 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 >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > > > ------------------------------ > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > End of time-nuts Digest, Vol 74, Issue 77 > ***************************************** > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
