Re: [TCML] X-ray cable best practices for feeder cable

[FIFTYGUY@xxxxxxx]

In a message dated 1/5/09 7:48:17 P.M. Eastern Standard Time,  
wavetuner@xxxxxxxxx writes:

>Here we revisit a long,old thread: I have 60 feet of primo,  terminated 100KV
>x-ray cable.
 
    Is that 60 feet with a Federal connector at  each end?

>If the cable was say half as long, (.0015uf) I would use  these

>receptacles on both ends. 
 
>It is evident I should cut the cable in half and likely strip back  the TC
>side for quick connection via threaded brass draw pull knobs at  the TC.


I cut an x-ray cable in half that was terminated  at both ends. Plug to bare 
wire. 
    I agree that it would be nice to have the plugs  on both ends, but 
there's not much point in using the Federal wells at the TC  end. Eventually it's 
going to be just exposed bare HV wire *somewhere* around  the TC. There's no 
safety advantage, and really no insulation advantage. At a  measly 19kVAC, you 
could put an automotive sparkplug boot on it. 

>I'll post a picture of my 3p Nikkie missile transformer which has  18"
>insulators and is absolutely a Frankenstein-like tube PS if anyone  doubts
>that. This baby is DC via (6) 8020 tube rectifiers a 400H filter  choke ;-)




    Aargh, it's "Nike", like the shoes. Both named  for the Greek god of 
speed (Mercury for you Romans). But if you have a certain  attachment to your 
missile radar unit, we'll look the other way if "Nikkie" is  a term of endearment. 
:)

>Additionally the HV supply cabinet will have  a 50 ohm 3KW  resistor bank
>(BIG) resistors - 110 ohm 20"x2.5"x (2) in parallel. This  will be tied to H1
>and go to a 4" 100 turn air coil inductor and out to  the TC per Dr. R's
>experience to reduce the speed of transients to the  primo PT via inductive
>reactance/impedance blumline effect.


>Does anyone know the blumline calaculations with a known capacitance?  No one
>seems to speak to the impedance of X-ray cable in 60hz so that  correct
>termination can be had sans all the reflected back  garbage.

    The EE's here are probably grinding their teeth  over your "blumline" 
references. 
    It's *Blumlein*. Alan Blumlein made huge  contributions to phonograph 
recordings and telephony. He pretty much invented  stereo sound reproduction and 
recording. He also invented the use of a flyback  transformer for TV. And he 
died during WWII while inventing airborne radar for  the Allies. Almost all of 
his contributions were used until the technologies  themselves became obsolete.
    A Blumlein transmission line requires the specific  condition of two 
equal transmission lines with a matched load (twice an  individual line impedance) 
in the middle. That's it. If you don't have this  configuration or values 
then it's not a "Blumlein" transmission line.
    
-Phil LaBudde
Center for the Advanced Study of Ballistic  Improbabilities
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