[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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