In SX Microcontrollers, SX/B Compiler and SX-Key Tool, davehein wrote:

I suspect the more complex implementation in the Circuit Cellar does lots of filtering to reduce harmonics.  In my quick and dirty implementation I produced lots of harmonics.  I was able to pick up the signal at the fundamental frequency of 850 KHz, but I also picked it up at the high end of the AM band at 1700 KHz.  Not only that, but I picked it up some of the upper harmonics on the FM band as well.  However, the signal was very low power, and I was not able to receive it at a distance of 50 feet from the buried wire.
 

I'll have to take a look at the latest issue of the Circuit Cellar to see how they implemented it.

 

Dave

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