RF CHOKE LOCATION
Subject: RF CHOKE LOCATION
From: richard.quick-at-slug-dot-org (Richard Quick)
Date: Mon, 6 Mar 1995 21:37:00 GMT
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* Original msg to: Esondrmn-at-aol-dot-com
> From: Esondrmn-at-aol-dot-com
> Subject: RF choke location
ES> Last week you said that my RF chokes should be located 4 to
ES> 5 feet minum from the coil primary. Can you elaborate on
Yep. Move the chokes back away from the primary/secondary.
ES> Is the idea to keep them completely out of the field
ES> generated by the primary?
Yes, and not only the primary, but all parts of the oscillating
Tank circuit (HV Pulse Cap, Spark Gap(s), Primary Coil, and the
cables/straps connecting these components). Inductance, other
than the secondary coil, placed too close to the tank circuit has
some detrimental effects. By placing the inductance off-axis by
90 degrees (which you did) you reduce, but do not eliminate,
ES> You can see by the pictures that I mailed they are only a
ES> couple of feet away. What happens if they are too close?
You get "mushy" tune mostly.
ES> Do I get RF coupling back into the transformers?
I could see where you might get some, but nothing a good RF
filter in the supply mains would not clear up.
The problem is generally that you do not get a nice narrow band
output from the tank circuit with coils, chokes, or concrete
floors too close to the tank circuit. I lift the primary up off
the floor at least a foot, and move chokes, transformers, etc.
back a few feet from the tank circuit. This also reduces the
number of "incidents" that are normal while coiling.
... If all else fails... Throw another megavolt across it!
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