500 GHz ? Really? How? Even counting 100 GHz is pushing it. You mean MHz, no?
-John ============== > 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 > <[email protected]> wrote: > > On Fri, Feb 21, 2014 at 9:47 AM, Bob Albert <[email protected]> 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 -- [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.
