[TowerTalk] SUMMARY OF RESPONSES TO MY 160M INVERTED L /SHUNT FED TOWER QUESTIONS

[n4kg@juno.com]

He should have said 4000 volts, not feet, 
for the voltage rating!

50 Ohm coax is typically 29 pf / ft.

I trim 1/2 inch of braid back at the end and tape to prevent arcing.

de  Tom  N4KG


On Sun, 30 Jan 2000 21:37:31 -0500 Joe L Blackwell <aa4nn@juno.com>
writes:
> 
> OK,  RG213 at about 25 puffs per foot makes a good capacitor.  I 
> needed
> 250 puffs, so
> 10 ft more or less should do it.  Run 1500w into that and standby 
> for the
> smoke.
> What is a "voltage rating of 4000 feet"?  New term for me.  Just 
> learning
> every day.
> de Joe, aa4nn
> 
> "Steve Babcock" <kinderh@cadvision.com> writes:> 
> > > Don't forget you may replace an ordinary variable cap with a
> > > length of coax. RG8 has a voltage rating of 4000 feet, and if I
> > > remember correctly, is 29pf per foot. Just seal the stuff and it
> > > should last for many years.
> > 
> > Another affordable way to get the tuning capacitor is to build one 
> out
> of
> > concentric peices of pipe with nylon spacers.
> > See the great article in October, 1999 CQ mag by VE3ERP..... 4 to 
> 5
> feet of
> > pipe can get you 200 to 300pf depending on diameter ratios. All 
> the
> details
> > in the article.
> > 
> 
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