[time-nuts] New WWVB modulation format receivers (NOT)

J. Forster jfor at quikus.com
Fri Feb 21 13:57:59 EST 2014


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
> <albertson.chris at gmail.com> wrote:
>
> On Fri, Feb 21, 2014 at 9:47 AM, Bob Albert <bob91343 at 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
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