Define 'needs a tube" Paul Swed and I have 5061's and both are way past what most would consider needing a new tube.
Search the archives on what we have done. I power mine up every 4 months and let it run for a few hours to a day. And once or twice a year. Last year mine has run for a couple weeks while using to do some experimenting. -pete On Fri, Jun 12, 2015 at 10:03 PM, lincoln <[email protected]> wrote: > Hello, > I'm guessing I all ready know the answer to this but: > A friend gave me a hp 5061b but in need a tube. Symmetricom was listing > the price of a replacement at 35k before the go bought out by Microsemi. > Given Microsemi has a tendency to rebrand equipment and then charge 4x the > price, an official tube is likely a way non starter. Friend seemed to think > there were "other" sources for tubes, but I am rather pessimistic. > > What do you think? Is this thing junk? I would hate to scrap it. > Maybe use it to house a GPSDO. > > Link > > On Jun 12, 2015, at 6:55 AM, Cube Central <[email protected]> wrote: > > > Hi Max! Thanks for the information, I was wondering if you had > documented what you did to your Raspberry Pi so that it might be > reproducible to someone like me (a newcomer time-nut and intermediate Linux > user) ... you had said: > > > >>> "Here is what I have been able to do with a Motorola Oncore UT+ that I > got from Bob Stewart awhile back. This is with a Raspberry PI 2 with a > number of tweaks and a custom compiled kernel. Nothing too drastic... plus > the current Dev version of NTP compile on the Raspberry PI." > > > > What tweaks? What options have you compiled? What are the gritty > details of your setup? > > > >>> "I'm getting better results letting ntpd discipline the clock over > doing kernel discipline... > > not surprising because the algorithms in the ntpd code are much more > sophisticated than the Linux kernel pps code... ntpd discipline provides > much lower jitter in my experience." > > > > what setting is this and how might I go about experimenting with it? Is > that the "flag3" option in the "Generic NMEA GPS Receiver" documented > here? https://www.eecis.udel.edu/~mills/ntp/html/drivers/driver20.html > > > > <snip> > > > >>> "Not too shabby for a killer deal on an Oncore UT+ for $5 from Bob! > I'm running the PPS out of the UT+ through a level converter to get the > ~3.3v PPS output... the serial output on the UT+ is also going through a > level converter direct into the Pi 2. Using the oncore 127.127.30.0 ntpd > driver and again, i'm not using hardpps kernel discipline." > > > > I see word HARDPPS in the driver you mentioned ( > https://www.eecis.udel.edu/~mills/ntp/html/drivers/driver30.html ) but > that documentation is a bit scarce... Could you fill me in on how you have > it set up? Is the PPSAPI also used for the "Generic NMEA GPS Receiver" > (driver 20) or the PPS driver (driver 22)? > > > > Thanks so much for your assistance! Sorry if these questions have been > posted before, but I am very curious about your setup as it nearly matches > mine! > > > > -Randal "r3" of CubeCentral > > > > > > > > _______________________________________________ > > 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.
