[time-nuts] 5MHz ocxo

Chuck Forsberg WA7KGX N2469R caf at omen.com
Wed Jul 25 21:18:53 UTC 2012


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?
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to 
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>

-- 
Chuck Forsberg WA7KGX N2469R     caf at omen.com   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







More information about the Time-nuts_lists.febo.com mailing list