[Lowfer] Rememberances or "I was a bootlegger too!"

[ToddRoberts2001 at aol.com]

In a message dated 9/5/2008 9:09:41 P.M. Eastern Daylight Time,  
evp at pacbell.net writes:
Actually did another spark transmitter  here a few years back.  This 
used a half inch spark coil but with  decent Q for the tank circuit and a 
good straight gap.  That put out a  pretty clean note and was pretty good 
copy on 160 meter band at my  brother-in-law's house a couple of miles 
away.  If was narrow enough  "to tune in" and had a pleasant tune to it.  
That was the end of such  activities but I've often thought it would be 
fun to organize a "spark  night" where guys around the country went on 
the air for a few minutes to  see how far they could be heard.

Ed
 
 
Fun stories to read about spark transmitters, thanks.  I notice some  of the 
Tesla Coil builders are still advancing the state of the art for  spark 
transmitters, except they are just exciting a self-resonant secondary  coil by 
itself instead of an outdoor antenna. They have some good  articles on why rotary 
gaps work, using choke coils between the spark gap and  transformer secondary 
terminals, high Q primary RF transformer design and using  the newer small MMC 
capacitor banks for the primary high voltage capacitor. They  are getting the 
efficiency pretty high for a spark gap type transmitter circuit  these days!
73 Todd WD4NGG
 



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