The Wattless
Transmitter
While is is
possible to received radio signals without battery power, it is
also possible to transmit voice without power at the transmit
site. I experimented with this, while studying physics in
college. My partner and I had built a regenerative one tube
receiver, when we made the discovery. We were working several
hundred feet away, when I connected a telephone mike to an
antenna and a ground wire. I was talking into the telephone mike
and my partner was listening on the receiver. When the receiver
went into oscillation he could hear my voice loud and clear. We
theorized this phenomen was due to the coupling between the two
antennas. The antennas were at least three hundred feet apart.
The schematic is
shown below: