[TowerTalk] Shadowing of small antennas by larger ones?

[n4kg@juno.com]

What makes you think that a 40M SPLIT  DIPOLE, 
Linearly Loaded, will exhibit a resonance on 15M?

That may be true for a CONTINUOUS, SELF resonant
full size 40M element (that is gamma or T-matched)
but NOT for a split and loaded element.  In fact, the
exact resonace can be moved around by changing
the length and termination on the feedline.

de  Tom  N4KG


On Wed, 31 Jan 2001 17:23:24 -0500 "Guy Olinger, K2AV"
<k2av@contesting.com> writes:
> Read the description carefully. On the C39, the 40 DE is BETWEEN the 
> 15 DE and the 15 reflector, NOT behind the 15 reflector. 
> 
> They HAVE had to deal with removing the 21 mhz resonance from the 40 
> "N" elements. The diagram is at home, but the distance from the 40 
> DE to the 15 DE on the same boom is a LOT less than the vertical 
> mast separation the original poster proposed between the separate 
> antennas.
> 
> > 
> > From: n4kg@juno.com
> > Date: 2001/01/30 Tue PM 11:51:25 EST
> > To: TOWERTALK@contesting.com
> > Subject: Re: [TowerTalk] Shadowing of small antennas by larger 
> ones?
> > 
> > You can put lower frequency elements BEHIND higher frequency
> > elements because the high frequency reflectors isolate other
> > elements to the rear.  
> > 
> > That is NOT the case for vertical separation where the lower
> > frequency elements are symmetrical about the mast as are the
> > higher frequency elements on the triband antenna.
> > 
> > de  Tom N4KG
> > 

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