Re: Tesla Receiver Coil

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>

Hi:

I once made an experiment, designing a Tesla coil operating at 10 
MHz, having a telescopic
antenna as topload. The primary was excited by a low-impedance slow 
square wave generator
where the spark gap would be. In this way, each transition of the 
square wave produces
a series of beats with energy flowing between the primary and 
secondary systems.
I made a receiver with exactly the same structure, taking the voltage 
over the primary
capacitor as output.
With the system correctly tuned, at each burst in the transmitter, 
the receiver receives
a similar burst, just increasing gradually and decaying more slowly. 
It shows the same
beats of the transmitted signal.
The system operates at two frequencies simultaneously, with a mess of 
harmonics and
intermodulation products also transmitted.
The system is very similar to the early Braun system for radiotelegraphy.
Nothing specially efficient, and just plain radio transmission, but 
an interesting
experiment. If the antennas are at small distance, "echoes" can be observed, as
the receiver retransmits the signal, it is received by the transmitter, and
then transmitted again.

Antonio Carlos M. de Queiroz