Well if we are talking about $50 then you have my attention.
No I am not afraid to use a soldering iron. Amateur radio is not my main interest here. I have the same compulsion many of you out there seem to have, that if I can get more accuracy I want it. I get that content smile on my face when my counter reads a string of zeroes on a measurement that is supposed to do just that. I am doing a lot better than 1 ppm right now. I have my counter and signal generator agreeing within about 1 Hz at over 500 GHz. When I get one beat in 10 seconds against 20 MHz WWV I have 5 ppb I think. I am close to that but it gets sticky using 20 MHz to communicate, plus the signal is only available in my location for a few hours on most days. I am doing similar things with voltage but you can't communicate voltage over the radio so I don't have that kind of agreement, more like 50 ppm. It's all in fun; I have no legitimate need for this accuracy. Bob On Friday, February 21, 2014 10:26 AM, Chris Albertson <albertson.ch...@gmail.com> wrote: On Fri, Feb 21, 2014 at 9:47 AM, Bob Albert <bob91...@yahoo.com> wrote: > I looked on line and it seems that these receivers are available for about > $150 and up. A little out of my price range right now but I'll keep my eyes > open. Watch the thread on this list about the Arduino based GPSDO. I think you can get the price down to $50. If all you need is something to calibrate frequency counter then all you need is 9 to 10 digit accuracy I'm going to do this just to prove it can be done for a low two figure price. But first I have to find a decent crystal oscillator that does not use up 1/2 of my $40 budget. If you want ultimate precision that you need a good GPS antenna in a good location, A high-end timing mode GPS receiver and a high-end double oven quartz oscillator. The cost adds up. But I think if you relax the specifications and shoot only for 9 to 10 digits you can greatly reduce the price. -- 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.
