[AMRadio] A lot of WWV and NIST discussion

[Robert Bethman]

I'll try this again.

Go to <www.techlib.com<http://www.techlib.com>>

On that opening page, there is the GPSDO right there.

Click on that item!

It WILL take you to the page with it, a complete description, and the entire circuit.

[Direct link: <http://www.techlib.com/electronics/GPSstandard.htm><http://www.techlib.com/electronics/GPSstandard.htm>]

Mr. Wenzel designed this for me.  Any number of 10MHZ ovenized VCXO SC Cut oscillators that are tune-able by external correction can be obtained and used.

For heaven's sake, DO NOT procure some Chinese system!  They are NOT reliable!

The expense isn't all that high.

The ICs are readily available.

Mr. Wenzel used an external 1PPS signal source for this project.

I obtained a Trimble Resolution T board that is NOT in production any longer.

There are quite a number of GPS receiver boards available that give the 1PPS signal.

The meter used is a +/- 3mA meter movement.  The movement is converted to a volt meter by use of a 25K trimmer.  Value NOT given in the schematic!

This provides a 10MHZ sine wave with the accuracy described by Mr. Wenzel.

I have it all here, BUT - I have NOT gotten it all assembled.  I managed to do significant nerve damage to both forearms last year.

This will require surgical intervention that is being scheduled this year.

My hands are numb and I have significant difficulty grasping even a soldering pencil or parts.

This provides an extremely accurate 10MHZ sine wave output!

Propagation just does not provide an accurate and reliable signal from WWV.

There are too many instances when WWV cannot be picked up at all.

Regards,
Bob Bethman, N0DGN