Re: carbon gaps

To: tesla-at-pupman-dot-com
Subject: Re: carbon gaps
From: Jim Fosse <jim.fosse-at-bdt-dot-com>
Date: Fri, 13 Sep 1996 05:20:54 GMT


>From: pierson-at-msd26.enet.dec-dot-com
>Subject: carbon gaps
>

>>I might be fun to see if a negative resistance oscillator could be set
>>up using the carbon arc as an active element. Has any one tried this?
>	Sure.  Much of early wireless used arc transmitters.  Work fine.
>	(OK:  A tad noisy by modern standards.  8)>>)
>
>	One of the earliest 'true cw' transmitters.
>
>	These were separate/distinct from a spark (gap) transmitter.  ARC
>	and SPARK are different critters.  The ARC transmitters were/are
>	capable of voice broadcasting.

That thought cascaded a whole memory-tree of old readings. thank you.
>
>	(Interesting thought, actually, use an ARC RF source as a 'driver'
>	for a tesla secondary....  Needs a whole differnt PS technology:
>	low volts, lots n lots a amps...)   My GUESS is that spark excitation
>	is more 'efficient' for tesla-type work.
>
	Either a huge turns ratio or a resonator design. 8 volts in vs
14kV. Ether way, it would be interesting to play with. I started 2
weekends ago with RH's post on a DC excited coil. I started out with a
1.5kVDC supply and progressed to a 4' fluorescent lamp as a gap. I
didn't have enough power to overcome the ambient 60Hz and 810kHz. 

(KGO's, 810kHz 50kW, antennae are about 4 miles away) I can't quite
receive them on a wet shoe string;)

	Regards,

	jim