It would be interesting to see if you can remotely mount the Rb lamp. The
high temps certainly do nothing for the long term reliability of the
electronics. A fan is a good start.
Bob
----- Original Message -----
From: "Peter Gottlieb" <[email protected]>
To: <[email protected]>
Sent: Wednesday, January 18, 2012 11:22 AM
Subject: Re: [time-nuts] FE-5680A won't lock
IMHO these units are designed for cooling by airflow around them and
minimal conduction cooling. With my unit there is minimal heat flow
from the unit to the PC board it came attached to. I am going to
simply cut down the board a bit and mount it in a small plenum made of
FR4 and use a small fan with controller. This will be simple and get
heat out from all sides. It should be the closest to the way it was
intended to be cooled, improved with the temp control, and still be
small enough to be placed into other equipment.
On 01/18/12, J. L. Trantham<[email protected]> wrote:
Use one of your 'locked' Rb as the 'standard' and then look at the 10
MHz
from the 'problem child'. See if you can adjust C217 (I think. Look at
the
archive.) to bring the 10 MHz signal close to the 'standard'.
Perhaps the oscillator is just out of 'range' and can be brought back
into
range where the loop can lock it. Or maybe that is what you have
already
done.
Both of my units get quite 'toasty'.
Joe
-----Original Message-----
From: [1][email protected]
[[2]mailto:[email protected]] On
Behalf Of Scott Newell
Sent: Tuesday, January 17, 2012 10:31 PM
To: [3][email protected]
Subject: [time-nuts] FE-5680A won't lock
Just got my 3 in from nichegeek. Paid Thursday, shipped Friday,
arrived this evening. Wow. (Actually arrived too quickly--I don't
have my t-bolt running, so I can't easily do an accurate frequency
check.)
Two power up and lock in <3 minutes. One powers up, gets toasty, and
gives 10MHz, but no lock and no PPS.
The tuning config on all three read back as 0. I've set the problem
child to near +/- FS and about +/- 25% of tuning range: still no lock.
Any suggestions on what I should look for or try? I'm not quite
ready to throw in the towel and contact the seller.
--
newell N5TNL
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