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echo: ham_tech
to: FRED MCKENZIE
from: JEFF EDMONSON
date: 1997-06-23 10:05:00
subject: Enc Examples Needed

 > In a message dated 06-17-97 JEFF EDMONSON wrote to LARRY KUNZ:
 >  JE> A DB-224 has 4 elements, and as I remember they are all fed
 >  JE> simultaneously, meaning that the Z would be somewhere around 12.5
 >  JE> ohms, per.
 >   Jeff & Larry-
 >      Antennas like the DB -224 are typically driven through a
 > phasing harness,
 >  that combines the individual dipoles' 50 Ohm impedance to match
 > a 50 Ohm
 > transmission line.
That, we knew  ;-)
 > It could get messy to combine an 8-dipole array using this technique.
 > Does anyone know how the "big boys" do it with 8?
I'm also interested how they do it with 16 bays!
 > My only thought is that they use folded dipoles
 > that combine in parallel to have a 50 Ohm impedance.
 > If so, the 4-dipole harness would work for 8-folded dipoles.
Double that, Fred, and let us know how that's done...
But, it would stand to reason that if the same harness would work for 
4-dipole arrays, would work for 8, then doubling that again, would mean it 
shouldn't have a problem working with 16 bays.  however, it would be quite 
space inefficient for anything under 440MHz.
73 = Best Regards
-Jeff KA5THB
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