[time-nuts] Quartzlock E10-MRX

[Matthias Welwarsky]

On Dienstag, 1. September 2020 14:25:31 CEST Richard Katsch wrote:
> Many thanks Matthias,Hugh.
> 
> The case doesn’t seem to have any direct method of fastening to a heatsink
> but something can be arranged I’m sure. The manufacturer’s documents don’t
> suggest anything. They do say that the base temperature can be up to 85
> degrees C which seems awfully hot.
> 
> I haven’t measured the temperature other than a finger test that indicates
> that more than 5 secs is uncomfortably hot. At that point I switched it off.

I wouldn't say "uncomfortably hot" is a cause for alarm. The lamp housing in 
the LPRO-101 runs at 100°C, the resonance chamber at roughly the same temp. 
You need Rb vapor at around that temperature (if that Rb is a traditional 
construction) for the system to work.

Anyway, what else can you do? If it's broken, the chances of repairing it are 
slim. If it works, no way to find out if it's in spec unless you run it. Just 
watch for smoke ;)

BR,
Matthias

> 
> Best regards
> Richard
> 
> On Tue, 1 Sep 2020 at 19:02, Hugh Blemings <hugh at blemings.org> wrote:
> > Hiya,
> > 
> > 
> > I'd wondered this also - my (limited) experience of Rbs are the
> > 
> > LPROs and they definitely need a heatsink (I have a nice story to
> > 
> > share about getting some made one day which I must write up, but I
> > 
> > digress)
> > 
> > 
> > Curious, I dug around a bit and only data I can find is a two
> > 
> > pager on the manufacturer website -
> > 
> > https://www.quartzlock.com/product/Rubidium/rubidium-oscillators/E10-MRX
> > 
> > 
> > The packaging itself doesn't appear to be designed with
> > 
> > heatsinking in mind, but perhaps there is an implicit expectation
> > 
> > of convection cooling at least to keep it manageable ?
> > 
> > 
> > Any idea what case temperature you're seeing @Richard ?
> > 
> > 
> > 
> > 
> > Cheers,
> > 
> > 
> > Hugh
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > On 1/9/20 5:01 pm, Matthias Welwarsky
> > 
> > wrote:
> > 
> > 
> > 
> > 
> > 
> > 
> > On Dienstag, 1. September 2020 07:15:34 CEST Richard Katsch wrote:
> > 
> > 
> > 
> > 
> > 
> > Hello All,
> > 
> > I have acquired a Quartzlock E10-MRX Rb 10 MHz standard. It appears to
> > lock
> > 
> > and produce a nice sine wave that stays in phase with my Trimble Tbolt for
> > 
> > a time which exceeds my attention span!!!
> > 
> > It does however get hot in operation. As this is my first experience with
> > a
> > 
> > Rb standard I don’t know whether this is normal or indicates that I need a
> > 
> > heat sink.
> > 
> > Any comments would be appreciated.
> > 
> > 
> > 
> > 
> > 
> > 
> > They're supposed to run hot, but excess temperature will degrade the
> > stability
> > 
> > and shorten the lifetime of the electronics. It's hard to recommend what
> > 
> > heatsink they require if you have no documentation. Typically you'll need
> > one.
> > 
> > My LPRO-101 need a heatsink with < 2K/W of thermal resistance to keep the
> > 
> > temperature in check.
> > 
> > 
> > 
> > BR,
> > 
> > Matthias
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > Regards
> > 
> > Richard Katsch
> > 
> > VK2EIK
> > 
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