http://www.ham-radio.com/wa6vhs/Test%20equipment/FREQUENCY%20STANDARDS/FE-5680A/fei%205680a.pdf
has high quality images of the 5680A and 5650A internal electronics.
Bruce
Hi,
some light might be shed on the heatsink problem by reading the data
sheet for the LPRO 101 (Symmetricom)
The units
Leigh
Leigh L. Klotz, Jr WA5ZNU wrote:
Chuck,
This device is a pull from a larger system, probably a cell site.
It's clearly designed to be mounted on something, as it has lots and
lots of holes around the edge. I suspect there's some thermal
management that's missing. The FEI sheet gives
Leigh
Leigh L. Klotz, Jr WA5ZNU wrote:
Chuck,
This device is a pull from a larger system, probably a cell site.
It's clearly designed to be mounted on something, as it has lots and
lots of holes around the edge. I suspect there's some thermal
management that's missing. The FEI sheet
I think we've all learned from this. Good info about the Efratom unit,
and sounds as though we should aim for around 38C with the FEI units as
well. The FE-5680 looks to be easier to deal with than the FE-5650, so
I'll look into that first.
Murray ZL1BPU
Well, it's air conditioning season again and I have been studying the effects
of the varying temperature caused by AC cycling on the Thunderbolt output (as
reported by the unit's internal monitoring messages). The attached image shows
the effects of the temperature cycling on the Tbolt
In message blu125-w8d0e8a08cfbcdcc3e5d3ace...@phx.gbl, Mark Sims writes:
Placing the Tbolt in a corrugated cardboard box [...]
We have discussed this topic some time back, and I relayed a suggestion
from the Danish Metrology Lab: Use an unplugged fridge.
Apart from a good air volume and
In article 2ed501c9e87a$a7a4a850$7900a...@athlon1200, Dave Brown
tract...@ihug.co.nz writes
Murray et al,
The package of both units is clearly meant to be mounted on
something-the real question is how much heat sinking would that
something have provided? Changing the external heatsinking to
I think that using a well insulated box (like a fridge) is probably not going
to improve things much with a Thunderbolt. The very modest improvement going
from a simple cardboard box (and .17C shifts) to an insulated box (and .060C
shifts) seems to imply that we are close to the inherent
In message blu125-w9e23fdf3e1618c93e603ece...@phx.gbl, Mark Sims writes:
I think that using a well insulated box [...]
The point for timenuts is not just the thermal resistance, but more
importantly the thermal *impedance*: you want to low-pass filter
the thermal changes so that they all happen
Sorry my post to the list is not meaningful and is something for sale,
extenuating circumstances of life at the moment.
Up for sale is an AVCOM MDM-1575-8 GPS antenna splitter, in good working
condition.
This unit was made for one company who used it for GPS work, and was not a
full production
Poul-Henning Kamp wrote:
In message blu125-w9e23fdf3e1618c93e603ece...@phx.gbl, Mark Sims writes:
I think that using a well insulated box [...]
The point for timenuts is not just the thermal resistance, but more
importantly the thermal *impedance*: you want to low-pass filter
the
Adding mass increases the thermal capacitance adding insulation
increases the thermal resistance.
It is possible to construct an enclosure with a long thermal time
constant together with relatively low thermal resistance so that the
temperature of a GPSDO or similar device within the enclosure
Murray Greenman wrote:
I think we've all learned from this. Good info about the Efratom unit,
and sounds as though we should aim for around 38C with the FEI units as
well. The FE-5680 looks to be easier to deal with than the FE-5650, so
I'll look into that first.
Murray ZL1BPU
The point for timenuts is not just the thermal resistance, but more
importantly the thermal *impedance*: you want to low-pass filter
the thermal changes so that they all happen in the area where the
PLL can cope with them.
Thermal resistance is about insulation, thermal impedance is
about
J. Forster wrote:
The point for timenuts is not just the thermal resistance, but more
importantly the thermal *impedance*: you want to low-pass filter
the thermal changes so that they all happen in the area where the
PLL can cope with them.
Thermal resistance is about insulation, thermal
Yes, thank you to all.
I'll go ahead with the heat sink on the bottom and consider a fan nearby.
Leigh/WA5ZNU
I think we've all learned from this. Good info about the Efratom unit,
and sounds as though we should aim for around 38C with the FEI units as
well. The FE-5680 looks to be easier to
Bruce,
Thank you for this point. I've seen Mu metal competitors but I can't
tell what the case is made from.
Pretty much everybody I've seen on this has had to make some kind of
allowance for getting the RF out.
I drilled a hole for an SMA connector and had it exit on the digital
half of the
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