How about a 10 MHz OCXO and a divide by two chip? Maybe an op-amp to
change and/or invert
the control voltage?
On 07/25/2012 02:05 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?
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--
Chuck Forsberg WA7KGX N2469R [email protected] www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
Omen Technology Inc "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430
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