[time-nuts] Odd HP 117A configuration

Tom Van Baak tvb at LeapSecond.com
Thu Sep 11 17:59:31 UTC 2008


> Something I've thought about, but not done is to make time decoder based on a 
> PIC micro controller.  Remember the 117 is only a frequency comparator.

Brooke,

Check the back of your 117A. There's a signal level output so
with clear enough reception you should be able to extract the
1 baud subcode and decode UTC in the same way as other
raw WWVB receivers.

> There is a free PC program that you can feed the audio output from a receiver 
> and it decodes WWVB time code.  The same company has another program that 
> decodes the Northern California DX beacons (as controls the receiver 
> frequency).  Note the beacons transmit in GPS controlled time slots with 
> stepping RF power levels.
> 
> Have Fun,
> 
> Brooke Clarke






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