Hi
The one thing you don’t want to do is play with insulation. There are two ovens
in a
normal Rb. Their temperatures are close to each other. It will not work if the
temperatures
are equal ( = there are reasons for the delta).
Since the two ovens are right up against each other, there is
Many thanks for the responses.
The take-home message that I've got is that it may be OK to run the device
with no heat sink but it's life might be extended by adding one. As it cost
~$300 it would be nice to get the maximum use from it.
I think what I shall do is to measure, or estimate, the
Hi
With an Rb, you have a magnetic shield (somewhere) as part of the overall
design. In some cases, this is worked into the outer package shell (… it’s
cheaper to do that way. ). There’s only so much you can do to move the parts
of the unit around.
=
A fan will not “move” the baseplate
Taka,
There's not much really wrong in making the oven(s) work harder to maintain
the desired Rb cell
temperatures because of a cooler baseplate temperature. If the thermal
design is done well, nothing
will run appreciably hotter and most of the electronics will run cooler.
However, it is my
If you can open the case, you should be able to locate the largest board
(if there is more than one) where most of the conventional electronics is
located and devise a way to keep that part of the case cool, with a fan, a
heatsink or both. The physics package is designed to run hot but if too
much
Hi
> On Sep 1, 2020, at 4:09 PM, Hal Murray wrote:
>
>
> kb...@n1k.org said:
>> I believe that they simply don’t have a body of long term data “in house” to
>> study.
>
> Interesting topic.
>
> How many units do you have to test to get useful data?
Likely a couple hundred spaced out over a
If it works, don't try to fix it.
In the datasheet
https://quartzlock.com/userfiles/downloads/datasheets/e10-mrx(2)(1).pdf
there is no cooling requirement specified.
I would assume that it is usually mounted on a PCB which adds some
cooling though not terribly much.
After 1 hour the case
There is lots of work in this area. Search "accelerated life testing
electronics" and you will find lots of information at various levels.
These guys have the PhD version, but you have to pay to join or be an
academic for access.
https://calce.umd.edu/
I've worked with this in the Aviation
Hi
If you have enough room for a heatsink that is the size of a couple of shoe
boxes, then
by all means use a convection heatsink.
There is zero difference between cooling by fan vs big heatsink as far as
device current
consumption is concerned. This or that level of cooling takes the
Will you elaborate on fan? Just about everything I've read, use of fan was
discouraged. Natural convection over heat sink fins were recommended. I've
done limited testing. When fan cooling, indeed temperature will go down, but
current consumption stays higher indicating heating is often
kb...@n1k.org said:
> I believe that they simply donât have a body of long term data âin
> houseâ to
> study.
Interesting topic.
How many units do you have to test to get useful data? How often do you have
to measure the output frequency?
Are electrolytics the typical weak link? Do
Hi
In this case there may not be much that can be done. In the more general case
( = a unit with a surface that mates to a heatsink) , it’s well worth doing
something.
I have an unfortunate lot of empirical evidence (on FRK’s and LPRO’s ) showing
that
a “no heatsink” setup is one with a
The annual Digital Communications Conference that TAPR co-sponsors with
the ARRL is coming up on Sep. 11 and 12 and will be available on the
Interwebs.
I'm forwarding the announcement here in an act of shameless
self-promotion because I'll be doing a presentation on the timing
performance of
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
Hi
Since you don’t know all the parameters of the design of the 53310, it’s going
to be
tough to define “best” in terms of an OCXO. None of the parts on your list are
better
than a 10811 in all respects.
Best to simply get a couple of 10811’s for $40 or so and spend some time
sorting them
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
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
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
On Mittwoch, 26. August 2020 18:46:59 CEST Hans Jørgen Eriksen wrote:
> Just got my hands on a HP 53310A Modulation Domain Analyzer (with option
> 031) As it doesn’t have option 010 – OCXO, I want to get hold of "the best
> OCXO" and either build it into my house reference or into the back of the
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