[time-nuts] Trimble Thunderbolt- Frequency lock indicator

[Wojciech Tomczyk via time-nuts]

I use an early Thunderbolt as a 10 MHz external frequency standard for my 
Elecraft K3 transceiver.I would like do add to it a simple indicator which is 
activated when Thunderbolt's output frequency is locked.I someone aware of a 
circut diagram of a such indicator? Any other options to indicated the LOCK 
state?
Tom
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