Yep, been there, done that. I'm a Ham and have several receivers. However, that method falls a bit short for what I think I need and have decided to look for something a bit better. What has been unknown to me is what result I might get if I take a GPS solution such as this: http://www.adafruit.com/products/746 and add the antenna and such, plus design a circuit to discipline one of the OXCO's I have. This unit does have a 1 pps output. I suspect more than resolution to X digits, there's also the question of whether a (low end) unit such as this will reliably stay locked. On the other hand, if I purchase something off-the-shelf that is good to 10 digits, at least I know what I'm getting. Thanks for your reply.
Russ K0WFS On Wed, Jan 23, 2013 at 4:02 PM, <time-nuts-requ...@febo.com> wrote: > Message: 1 > Date: Wed, 23 Jan 2013 11:48:29 -0800 > From: Chris Albertson <albertson.ch...@gmail.com> > To: Discussion of precise time and frequency measurement > <time-nuts@febo.com> > Subject: Re: [time-nuts] Least costly 10 MHz reference solution > Message-ID: > < > cabbxvhudh5hp6xorwqh6pth_s17vbgptnr-fdtao1zhr1rh...@mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > >>.... My requirement/desire is to have a 10 MHz > >> standard for my lab that I can trust to an accuracy of 7 decimal places > > At 10,000,000 Hz your required accuracy is 1Hz. You can get to that > level by "zero beating" to WWV. This is very inexpensive, free if you > already have a radio. What you do is adjust the frequency of any > local oscillator until the beat frequency with WWV is greater then one > Hz. You can either listen or use a scope > > Most people here are wanting 10 to 13 digits and that requires more > work but 7 digitas is "way easy". That said you might just as well > get the GPS which gives about 13 digits over a longish measurement > period. But if you are looking for the lowest cost way to get to 1Hz > the old methods will do that. > In fact you can zero-beat any radio station that has a known > frequency. All comercial braodcast stations are good enough but WWV > just happens to use a "round number" carrier freq. > > > > > -- > > Chris Albertson > Redondo Beach, California > _______________________________________________ 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.