From: kraken.sankey@gmail.com   
      
   On 07/01/2026 17:53, john larkin wrote:   
   > On Wed, 7 Jan 2026 15:41:04 +0000, TTman    
   > wrote:   
   >   
   >> Bac in the early 80s, I nade a lot of money selling 'better than normal   
   >> accuracy' digital watches. A colleague designed and made an accuracy   
   >> tester that showed +/- 20 seconds/month. The source accuracy was from   
   >> MSF Rugby RF transmitter ( 1 pulse/second?). The detector ( I think) was   
   >> some form of piezo... it was about 2mm diameter glued into a BNC housing   
   >> ( for simplicity). It worked by touching the piezo probe onto the back   
   >> of the watch ( with the back off) and I was able to adjust the trim cap   
   >> to get close to a few seconds per month ( ignore ambient/body temp)   
   >> This probe went into the box via a cable, was amplified and somehow   
   >> comaped to the source and converted into secs/month.   
   >> Can anyone figure out how this probe was constructed?   
   >> Reason- I want to build another one with a 10Mhz reference Xtal etc.   
   >> any suggestions welcomed.   
   >   
   > I'd expect that removing the back affects the oscillator frequency.   
      
   More than likely... but a re test after adjustment and the back replaced   
   would cover that. Could what I thought was a 'piezo' at the end of the   
   probe just have been a piece of wire?   
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   > John Larkin   
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