Hi Paul, and everyone. Yeah, that's a good question: how much accuracy do I want? I'm really just looking for a relatively easy project; one that will go to successful completion and give me a sense of accomplishment. At this moment, I have the problem of the man with two clocks. Better than 1 Hz @ 10MHz accuracy would be good. But, realistically, if the 5334B and 8640B both tell me the same thing, then I'll probably be happy. I could do that with the Trimble 34310-T, a pot and a flip-flop, but then I'd feel compelled to listen to WWV on occasion and tweak the pot! LOL I do have OCD, so I'm getting involved with timing with more than a little trepidation.
I want this to be as low budget as is reasonably possible, barring wastage, so I think a 1PPS source and Bert's FLL are the right choice. Is there actually a PLL circuit that works with a 1PPS reference? I only found a very few GPSDO projects during my search, and Bert's was the only one using the 1PPS signal. And, I just like the way he did it, right down to giving the possibility of powering the output op-amp from the VREF output of the 34310-T. I'm assuming that won't overload it, of course, so any comments on that would be appreciated. Bob - AE6RV ----- Original Message ----- > From: paul swed <paulsw...@gmail.com> > To: Discussion of precise time and frequency measurement <time-nuts@febo.com> > Cc: > Sent: Thursday, June 13, 2013 1:47 PM > Subject: Re: [time-nuts] New to list and GPSDO questions > > Absolutely agree with this comment. But understand thats a trade off for > simplicity and for many radio operators its good enough as they say. > Whats really not been mentioned in the thread is how accurate do you want > to be or need. > Be very careful with the answer. Time is the drug that keeps on giving. > $$$$$ > Regards > Paul > WB8TSL > > > On Thu, Jun 13, 2013 at 2:41 PM, Attila Kinali <att...@kinali.ch> wrote: > >> On Wed, 12 Jun 2013 20:29:26 -0700 (PDT) >> Bob Stewart <b...@evoria.net> wrote: >> >> > Hello to the list. I saw on K3PGP's site a mention that >> > the UT-41 GPS receiver had a 10KHz signal on-board so I decided, why > not >> > build a GPSDO for my "new" HP 5334B? Unfortunately the one > I bought >> doesn't >> > have a 10KHz point, and the board doesn't even pull out the 1PPS > signal >> from >> > the chip. So I've had to switch gears and will go with > VE2ZAZ's board. >> >> Please be aware that VE2ZAZ's design uses a frequency locked loop and > not >> a phase locked loop. Thus you end up with a slight frequency error >> (instead of a slight phase error). _______________________________________________ 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.
