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[TowerTalk] Shunt Feed Capacitor for Tower

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Subject: [TowerTalk] Shunt Feed Capacitor for Tower
From: (Tom Rauch)
Date: Fri, 8 Feb 2002 19:51:15 -0500
> Just for fun, I ran my whole-tower model with a zero-current source at
> the junction between the top 40m yagi's reflector and boom.  At 200w
> input to the shunt feed (2A @ 50 ohms, if I did it right) the model
> shows 580v there, vs only 68 volts across a similar point on the
> tribander 7 feet below it.  

For arcing, use peak voltage. Peak voltage is 1.414 times 580 or 
just over 800 volts. The insulation has to hold off that voltage in all 
sorts of weather with a safety factor, and any transients or 
momentary discharges that start an arc can cause an insulation 
failure if the transmitter is running. 
73, Tom W8JI 

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