Topband: Caged Inv-L - Pros and Cons ?

[ZR]

Id expect the lower RF resistance of 2X more wire would help also.
My only cage experience were a pair of 1/4 wave verticals for 80 that were 
also fed as half waves on 40 at a prior QTH here in the same town. The cage 
was 6 #12 wires 12" in diameter; 2:1 BW was almost 400KHz on 80 and 
resonance in about the middle was reduced to 59'. The radials were about 60 
each in the 40-70' range and performance was sufficient to take 2nd place NA 
80M in an ARRL CW DX contest in the 80's. The next or following year it was 
first place all bands and 160 was the 90' shunt fed tower with the mesh for 
the first 50'  mentioned before on here.

Carl
KM1H


----- Original Message ----- 
From: "Victor A. Kean, Jr." <vkean at k1lt.com>
To: <topband at contesting.com>
Sent: Tuesday, January 24, 2012 11:45 PM
Subject: Re: Topband: Caged Inv-L - Pros and Cons ?


> On Tuesday, January 24, 2012 11:34:30 pm Jim Brown wrote:
>> On 1/24/2012 6:29 PM, Dan Bookwalter wrote:
>> I am considering modifying my Inverted L such that the vertical part (~ 
>> 70 ft)
>> is a cage of say 4 wires , purely for bandwidth. Besides BW any Pro's and 
>> or
>> Con's to this idea ?
>
> In exchange for greater bandwidth you get lower radiation resistance which 
> for
> most systems would translate into slightly lower efficiency.  Of course, 
> if the
> increased bandwidth allows you to avoid a tuner or SWR-related feedline 
> losses,
> then net effect might be a wash.
>
> Victor, K1LT
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