Take another look at flea bay. If you search for < "5 mhz" oscillator >
and weed out the trash there are a few decent looking units.
As for repairing the original, go for it. You can't make it any worse.
I would use a utility knife to scrape away as much solder as possible
but don't use the sharp edge of the blade, use the back of the sharp
edge so that it cuts more like a cutter on a lathe or milling machine.
Once you've got the excess out of the road, my tool of choice is a
micro-torch. Pre-heating with a heat gun might be a good idea, too. If
you search the archives you'll find more ideas on opening these things.
Ed
On 7/25/2012 3:05 PM, Paul Flinders wrote:
I've finally had chance to pull my Rapco 1804M GPS conditioned
oscillator apart to try to debug it.
To recap I bought this a few months ago from an ebay vendor. It was
fine at first (for a few hours) although I needed a better antenna or
better site for the one I have but the second chance I had to spend
any time on the antenna the 1804M itself decided to develop a fault
running for a few seconds then restarting the firmware.
It looks like the ocxo has died - pulling it from the unit and running
it stand alone produces a similar result, 10MHz output for a short
while, then it dies. Presumably this is related to the oven heating up
and a dry joint or something else that doesn't like getting
warm/expanding.
The ocxo in the Rapco is an HCD-66-SC 5MHz 12V unit. They are
completely sealed and I doubt I could get into it without destroying
it so repair seems out of the question.
There is a UK supplier of HCD Research ocxo's and although the HCD-66
is clearly obsolete, a current unit - the HCD-660 looks about the
right spec (http://www.golledge.com/docs/products/ocxos/hcd660.htm).
However I'm pretty certain that if I have to "request a quote" the
price will be beyond what I can afford to spend fixing the unit.
The only 5MHz ocxo available on fleabay is a Symmetricomunit but the
auction has no data on it, nor can I find any on the net. It's obvious
from the photos though that there are a couple of extra pins compared
with the HCD-66 so it wouldn't fit the PCB.
Does anyone know where I might be able to locate a suitable (used)
replacement?
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
