[time-nuts] 5MHz ocxo

Tom Miller tmiller at skylinenet.net
Wed Jul 25 21:54:01 UTC 2012


I have an original that I could send to Dave at Artek for scanning. I don't 
see it on his site.

I don't know what he will charge but usually it's very reasonable.


Regards,
Tom

----- Original Message ----- 
From: "Tom Miller" <tmiller at skylinenet.net>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Wednesday, July 25, 2012 5:27 PM
Subject: Re: [time-nuts] 5MHz ocxo


Can you post up a few pictures of the oscillator?

There have been people that have opened these up and repaired them. If you
feel not up to it, why not see if someone on this group can help.

Repairing it will eliminate a lot of searching.


Tom


----- Original Message ----- 
From: "Paul Flinders" <paul at flinders.org>
To: <time-nuts at febo.com>
Sent: Wednesday, July 25, 2012 5:05 PM
Subject: [time-nuts] 5MHz ocxo


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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