Hi: What is the new bandwidth for BPSK WWVB going to be? Why are they going to BPSK, cheaper clocks?
How am I going to compare GPS to something to see if GPS is accurate? What about 400.1 MHz GEOS? Thanks, Ron -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of paul Sent: Thursday, July 05, 2012 7:49 AM To: time-nuts@febo.com Subject: Re: [time-nuts] HP 117/10509a As John has mentioned all of the old receivers are dead! They will not lock to the new BPSK signal. Though John and I have been working to see what can be done I have to say to date lots of methods have been tried and none really all that successful. These methods include phase lock, squaring/doubling and dividing. The normal types of things used to de-bpsk a signal. Or as I call the system the "d-psk-r". I can see how these methods in general work. But the noise hits on the east coast are pretty troubling in causing phase flips. Essentially you need a way to force the the system into one side of the phase always at 120 Khz. So here is the approach I would take. The RF stage you are speaking about has 3 nuvistors and those would easily be replaced by 2 op amps with about 10 db of gain to spare. Simply build 60 KC tuned tanks between stages and you would be in business. I have no idea but the existing L+Cs might be useful here. Then when done you would have a fantastic wwvb signal strength meter and thats all. Its funny on the nuvistors I thought they would be an issue also. But I have been getting them for 2-3 dollars each and they do not really die all that often. On 7/5/2012 8:42 AM, Gordon Batey wrote: > Ron, > > I would certainly be interested in any conversion scheme that you come up > with. I have 2 117's and hope to get them operational sooner rather than > later. -:) > > Gordon WA4FJC > > ============================================ > > Date: Thu, 5 Jul 2012 00:14:32 -0700 > From: "Ron Ward" <n6idl...@comcast.net> > To: "'Discussion of precise time and frequency measurement'" > <time-nuts@febo.com> > Subject: Re: [time-nuts] HP 117/10509a > Message-ID: <A12C52D31F1E4BFB96841D691B4E86DE@RonPC> > Content-Type: text/plain; charset="us-ascii" > > Thanks Charles: > I will consider your ideas as they seem to be excellent! > > I wonder if I could just make the whole unit run off of +24VDC or +12 > VDC. > I need to look at the schematics and see what would be the best way to > proceed. > > I currently do not have an antenna for WWVB and need to get up and > running before I do anything with it. > > If successful, would anyone want information on my conversion? I also > have a fluke 207 that needs to be recapped. > Thanks, > Ron > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
