[TCML] Contribution to TCML

[Jozefau@xxxxxxx]

BIPOLAR HORIZONTAL AND TWIN BIPOLAR TCs
> I am mostly armchair coiler, still I made several horizontal small bipolar 
> TCs. They are portable and there is no need of any RF ground. Providing 
that 
> you choose right coupling and tune precisely, all racing sparks should be 
> eradicated. 
> The smallest bipo is powered by 24V battery/  square wave oscillator LM555 
, 
> LM393: www.rmcybernetics.com/  8 x 2N3055/  two ignition car coils/  HV 
diode / 
>  static SG :  copper tubes + fan.  Primary coil: helical 160mm (6 2/8") 
diam./ 
>  main cap. 5nF / Secondary: 6cm   (2 3/8") diam., 950 turns of 0.335 Cu, 
> 6.7mH.  Toploads are tin circular containers 19cm (7 1/2") x10cm (4"). I am 

> using the same toploads for all my TCs. 
> Performance: usually 22-20cm thin connected streamers, sometimes up to 
> 25cm (10") (humidity ? ). Children toy, but this little TC is a valuable 
> educational source - tuning & watching scope is really great fun.     
> I am also playing with more conventional bipo TC powered by NST: Primary 
> coil: helical 23cm (9 1/4") diam., secondary coil: 10cm (4 3/8") diam., 
1210 turns of 
> 0,335mm/ toploads and SG as above. Results: NST 6000V/30mA = 33cm (13") 
> sparks, 7500V/30mA = 39cm (15") sp., 1200V/30mA = 50cm (20") cont. 
streamers. and even longer, but 
> family and neighbours do not like it because of noise and too much ozone.
> BEST IS TWIN BIPOLAR TC:  
> In nutshell: 240V/50Hz - Fuse 3A - Variac 260V/2A - EMI f.- NST 7kV/30mA 
> (225W) - Simplified RCR filter: http:/hot-streamer.com/greg - spark gap as 
above:  
>    3 x 2mm gaps - main cap. 12.5nF - twin TCs..  Secondary: 70mm (3")diam., 

> 850 turns of 0,335mm Cu, 9.5mH. Toploads are the same. Both coils have been 
made 
> identical as best is possible, wound in the same direction. As always, I do 
not 
> have any RF ground, not even "counterpoise".  Primary: helical 20cm (8") 
diam. 8 
> turns of heavily insulated HiFi flat cable (8 AWG). You can wind primaries 
> either in the same or in opposite directions. They  perform both ways. 
> well. However, the last choice seems to be slightly more efficient. Taps at 
5 turns on each coil. If the primaries are wound in opposite 
> direction, you have to tap only one prim. coil at the beginning and at the 
end of the 
> winding. 
> Performance :  44-45cm (17") continuous connected streamers. You can 
increase 
> performance by using of four circular tin toploads in the "double-decker" 
> arrangement. Providing that all four toploads have sparking tips, you can 
get 
> interesting double, parallel 15" horizontal streamers.
> 24V battery supply : main cap. is the same 12.5nF.  Performance: 27cm (10 
½") 
> cont.thin streamers. 
> I am grateful for the advice to Kurt Schraner and Brian Basura.
> Regards to all coilers     Jozef
   
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