[Elecraft] OT - The HeyPhone

[Bill Frantz]

For those that might be interested in further information about 
underground radio communications, the National Speleological 
Society's Communication and Electronics section has placed back 
issues of its publication online for free down load at:

   <http://caves.org/section/commelect/drupal/speleonics>

Some of the European radios have had problems in the US because 
they are sensitive to the harmonics of our 60 Hz power.

73 Bill AE6JV

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