[BC] Isotron AM Antennas

Tom Radiofreetom at gmail.com
Fri Feb 20 10:23:06 CST 2009


Hmm...

That explains what I did wrong when I tried a BCB "rubber duckie"  
Thanks, Richard!

Quick question -

If the pipe were double the diameter, could it be built on a 10-foot 
section?  Without doing the math or loading EZNEC - I'm on short time 
right now - seems like it would.

RichardBJohnson at comcast.net wrote:
>
> If you have no tower standing, get a 20 ft section of 2-1/2 in plastic sewer pipe
> (two 10-foot sections). Support it over your ground-plane with three guys
> made of plastic rope. Run coax to its bottom, and connect the shield to your
> ground-plane (dig a hole and locate one radial). Wind the plastic pole with
> #10 insulated wire over its entire length before you erect it You will need
> a 100 ft roll. This will be the "tower." Find its resonant frequency by connecting
> the end near ground to ground and bringing a real portable radio (the kind with
> a continuously- tuning dial) near it. A sharp peak in noise (or distant stations) will occur
> at resonance. Cut off some wire to bring the resonant frequency up to your
> station's frequency. Do the final tuning by spreading out turns. 

-- 
Tom Spencer
PG-18-25453 (nee' P1-18-48841)
http://radioxtz.com/




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