[time-nuts] 5MHz ocxo

[Mark Spencer]

This approach could also facilitate using a higher perfromance OCXO.  This is after all time nuts (:   I'm surprised to hear how few 5 Mhz OCXO's are avaliable on the bay right now.   Earlier this year I picked up a nice Wenzel 5 Mhz OCXO for <$100.00  

--- On Wed, 7/25/12, Chuck Forsberg WA7KGX N2469R <caf at omen.com> wrote:

> From: Chuck Forsberg WA7KGX N2469R <caf at omen.com>
> Subject: Re: [time-nuts] 5MHz ocxo
> To: time-nuts at febo.com
> Received: Wednesday, July 25, 2012, 5:18 PM
> 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     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
> 
> 
> 
> 
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