> NO! WOW! If this is true then you just saved me hours of work and lots > of $$$$ for something that would end up being useless.
It is true. It was discussed a few months ago. I have posted on the testing repeatedly. > Will WWVB still be useable for frequency phase comparisons, perhaps by > long integrating periods? No. The receivers must be modified or replaced. The mods are non-trivial in practice. > I spent a lot of time and effort with LORAN and they just killed it. t least a year ago. -John ===================== > > Technology just keeps costing me! > > Ron > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of J. Forster > Sent: Thursday, July 05, 2012 6:31 AM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] HP 117/10509a > > You do know that neither a 117A or a 207 will work when WWVB changes to > BPSK fairy soon? > > -John > > =============== > > >> 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 >> >> >> -----Original Message----- >> From: [email protected] [mailto:[email protected]] > On >> Behalf Of Charles P. Steinmetz >> Sent: Wednesday, July 04, 2012 11:10 PM >> To: Discussion of precise time and frequency measurement >> Subject: Re: [time-nuts] HP 117/10509a >> >> Don wrote: >> >>>the fet breakdown voltage has of course got to be high enough. >> >> If the nuvistor is used as a common-cathode or common-grid amplifier, >> you can cascode the fet with a bipolar to extend its drain voltage >> range. You will need to come up with an appropriate bias source for >> the bipolar. Generally, you would want at least 10-15 volts across >> the FET channel. >> >> Choose an appropriate JFET (transconductance, drain current, and >> gate-drain voltage similar to the nuvistor at the nuvistor's >> operating point). You can add degeneration (source resistance) to >> lower the FET's transconductance if it is higher than the nuvistor's. >> >> Best regards, >> >> Charles >> >> >> >> >> >> _______________________________________________ >> 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. >> >> > > > > _______________________________________________ > 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.
