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[TowerTalk] Transmitting cap for 6 M antenna

Subject: [TowerTalk] Transmitting cap for 6 M antenna
From: "Jim Miller" <JimMiller@STL-Online.Net>
Date: Fri, 4 Jun 2004 18:53:36 -0500
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I made a 6 meter antenna from 1/2 inch copper pipe. Center fed(gamma match 
using 12 inches of 1/4 copper tube), mostly like a letter U with the upper ends 
folded in towards the center but not connected or very close together.  I found 
I need a cap about 50 pf to get the best match.  The caps I used to find the 
right one were ceramic disks.  I have only used the lowest power to find the 
matching value.  Since caps are rated in pF and voltage and not in wattage, 
What values do I need to use it on my 746 (100w)?  OR what other kind of cap 
(and what value) can I get that would be better than the ceramic disks?  And 
depending on the type, how would I protect them from the weather?

I have seem matches using RG8 and tubing but don't know how to calculate the 
length or the shorting distance.  Would this be a possible solution?  And can 
someone give me starting measurements for something like this?

Newbe at antennas(and most everything else too).

Tnx es 73, de Jim KG0KP

See:  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.

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