[time-nuts] Using GPS to Fine Tune a Rubidium Frequency Standard.
EWKehren at aol.com
EWKehren at aol.com
Fri Mar 28 17:23:38 EDT 2014
The QEX unit is a spin off of the Shera, how ever the DAC is only 12 bits
covering the full tuning range of the Rb. Shera does it better with 18 bits
and has additional features. I would not spend the money to get a copy.
Bert Kehren
In a message dated 3/28/2014 2:42:55 P.M. Eastern Daylight Time,
mgeorge at tuffmail.us writes:
Anders:
I am a QEX subscriber and have that issue but I haven't built
the circuit.
The author referenced Brooks Shera as the basis for his work.
He uses a Trimble Resolution T GPS for a PPS reference and an
LPRO-101 Rubidium oscillator for the 10MHz.
His circuit divides the 10MHz output from Rb by 100 and
compares the phase of the 100kHz against the PPS.
A PIC16 MCU is the controller and uses the phase data to control
an external DAC to drive the Rb frequency control pin.
There were a couple of other time & frequency related articles in 2013
if you decide to get the CD.
Mike
On 3/21/2014 09:20, Anders Time wrote:
> Does anyone have a copy of the QEX 2013 november article(Bill Kaune)
"Using
> GPS to Fine Tune a Rubidium Frequency Standard"?
>
> I´m really interested in this subject, but I can´t find this magazine in
> Sweden. I have contacted QEX, but it is very difficult to buy
back-issues.
>
> Have any one built this frequency standard and can tell me more about the
> project?
> You can access the source code for the project here:
>
http://www.arrl.org/files/file/QEX%20Binaries/2013/November_13/11x13_Kaune_PIC_Code.zip
>
> /Anders
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