[R-390] WWV Frequency Standard

[rbethman]

Perry,

This IS true!

However, Amateur Radio as a whole has not been taught this methodology.  
Therefore my statement stands in the context that it was used.

Second, also having served back then - THERE WAS A REGULARLY SCHEDULED 
CALIBRATION SYSTEM!

This system went down to TS-352s and TS-505s.   The calibration shops 
WERE traceable back to what was then the NBS, now NIST.

This ment that frequency counters, signal generators, and oscilloscopes 
were ALL calibrated on a regular basis!  We, as a hobby, do NOT have 
this, and to my knowledge, with "perhaps" a handful of exceptions, do 
NOT do this.

Bob - N0DGN

Perry Sandeen wrote:
> Gentlemen,
> <snip>
>   

> Uh, if all that is true, please don’t tell the USAF and Hewlett Packard or they might become confused.  (At least in the past.)
>
> Using the well known formula of a kebelsa sausage divided by the length of the ballast tube (or something like that) they use the 1ms (which is five cycles of  1kHz) tick for frequency calibration by feeding that one tick per second tick to the input of an external scope trigger and the source to be checked or calibrated to the vertical amp.  Then on watches which direction and the rate at which the wave appears to move. Using a watch or clock one can then accurately calculate the difference.  One can also reverse the input configuration and watch the “tick” move.
>
> Watching the “tick” move was how we kept the receiver site HP 105 at Karamursel Air Station in Turkey, 40 years ago, calibrated even though we had a muti-thousand mile path from Boulder Colorado.
>
> HP also recommends this as one method for the HP 5335A frequency counter(among others)time base calibration.   They also list a frequency offset table for rates from 1E6 to 1E10.
>
> The beauty of this technique is anyone at home having a scope with external trigger capabilities can calibrate their “house standard” oscillator to extremely fine tolerances at a very low cost and effort. 
>
> Regards,
>
> Perrier
>
>
>
>       
>
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>   

-- 
Bob - NØDGN