[time-nuts] Lamp for FRK Rubidium Needed

[EWKehren at aol.com]

Having had more than ten FRK's and M100's on my bench and once locked none  
where as low as any thing in E-9.  What you should buy is a ubox for $ 16  
shipping included and you will with your counter be able to get better than 
1  E-9 for testing.
Bert Kehren
 
 
In a message dated 8/10/2014 2:30:50 P.M. Eastern Daylight Time,  
ed_palmer at sasktel.net writes:

How did  you make the measurement that showed a 0.8 Hz difference? What 
are the  specs on your Racal reference?  When was it calibrated and 
against  what standard?  That will tell you how much confidence to put in 
it's  frequency.

As others have said, an FRK isn't a primary standard and  should be 
calibrated against a primary standard.  However, 0.8 Hz is  an error of 
8e-8.  I don't believe it's possible for a Rb standard to  lock and be 
that far off.

>From your web site you seem to have quite  an assortment of HF radios.  
Do any of them have enough resolution to  do a quick check by using one 
of them as a transfer standard? Measure a  known-accurate radio station 
frequency and then measure both the Racal and  the FRK.

Ed

On 8/10/2014 4:01 AM, Peter wrote:
>
>  Thanks to the help from members here I now have a locking FRK.
>
>  My bulb looked pretty clear, and i couldnt find any deposits or "bits"
>  inside, but decided to give it a good soaking at about 150 deg C using  
my
> hot air re-work gun for about 10 mins.
>
> I have  checked it against my Racal ovened reference and found a 
discrepancy
>  of about 0.8 Hz.
>
> Now the million dollar question...Can I be  sure the FRK is good before I
> start to use it as my standard  frequency?
>
> Is the FRK constructed in such a way that the  frequency accuracy is 
assured,
> or do I need some way of verifying the  FRK, or calibrating it.
>
> I dont want to trim my ovened  reference to the rubidium, only to find the
> rubidium is not as  accurate as I thought?
>
> Sorry if dumb questions, but just  starting my quest for "time nut" 
status!!!
>
>  Thanks
>
> Peter
>  G0RSQ
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