QRP Voice Powered Transmitters - CW and Speech!

[Joseph Bento]

Richard,

I was about that age when I discovered that the ear pieces from a 
Western Electric 500 telephone needed no power source to produce a 
'telephone'.  I had two ear pieces and connected them together.  I then 
reconnected them via a 100 foot extension cord.  I had made a 
sound-powered telephone, and I didn't even (yet) know what that was.

Joe, N6DGY


On 3/14/2013 7:57 PM, Richard O'Neill wrote:
> On 3/14/2013 7:48 PM, Phil wrote:
>
>  …and into the tin.
>
>  It was around the forth or fifth grade when I discovered one could 
> make a phone with paper cups and kite string. As I recall it worked 
> well over a hundred feet. Today, communicating by radio over 100 miles 
> by voice and 1300 miles by code with no energy source other than the 
> spoken word seems almost unbelievable. I just gotta build me one of 
> these. I presume it's covered by part 15 rules. ;-)
>
> Richard
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