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 <[email protected]> wrote: > From: Chuck Forsberg WA7KGX N2469R <[email protected]> > Subject: Re: [time-nuts] 5MHz ocxo > To: [email protected] > 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? > > > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > -- 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 > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
