Re: KAT500 update
Posted by
Cortland Richmond-2 on
Dec 09, 2011; 2:09pm
URL: http://elecraft.85.s1.nabble.com/KAT500-update-tp7072932p7078306.html
You are assuming that the choking impedance is what the transmission
line used for a winding sees; THAT is always whatever impedance the SWR
presents. The 2500 Ohm choking impedance is only seen by current on the
outside of the cable, a good deal less power (thus voltage) than what is
inside. It need only be insulated enough to prevent arcing from output
to adjacent turns.
Cheers!
Cortland
KA5S
On 12/8/201116:43 n09e wrote:
> Imagine choke constructed with RG174 looped through a toroid 10 times. Also
> imagine output resitstance 2500 Ohms and 100W power.
>
> On input, RG174 has a peak voltage of 100V. No problem.
>
> On output, RG174 has a peak voltage of 1000V. It would melt in seconds.
>
> What is wrong here? Assumptions?
>
> Ignacy
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