[TowerTalk] Fw: Off Center Fed Antennas

[Gene Fuller]

----- Original Message ----- 
From: "Gene Fuller" <w2lu at rochester.rr.com>
To: "Bill Ogden" <ogden at us.ibm.com>
Sent: Tuesday, June 04, 2013 2:37 PM
Subject: Re: [TowerTalk] Off Center Fed Antennas


> My 160 meter "half slopers" work great. Maybe it's because I call them 
> "quarterwave slopers". Or, maybe because I never tried to "tune" them - 
> just use a little L network for matching to the coax. Or, maybe it's 
> because I have six 100 foot raised radials around the tower. Or maybe it's 
> because I have three in different directions because I used to use them as 
> reflectors for three 80 meter sloping dipoles. Or, maybe it's because I 
> ground the coax shield to the tower at both the top and the base of the 
> tower. Or, maybe I just happen to have good earth. Or, Or, Or. The point 
> is we all use slightly different flavors with "standard" recipes and some 
> taste better than others.
> Gene / W2LU
>
> ----- Original Message ----- 
> From: "Bill Ogden" <ogden at us.ibm.com>
> To: <towertalk at contesting.com>
> Sent: Tuesday, June 04, 2013 12:54 PM
> Subject: [TowerTalk] Off Center Fed Antennas
>
>
>> Off-center fed antennas are like half slopers. They work well in some
>> cases and work poorly in other cases, and it is difficult to predict 
>> which
>> result you might have until you try it.
>>
>> It might be fair to say there are more environmental considerations for
>> these antennas than for a simple dipole or quarter-wave vertical.  All 
>> the
>> environmental aspects can make them difficult to model.  It is unfair to
>> say, flatly, that they are poor antennas.  ("Environmental" includes
>> things like grounding, chokes, bonding, height, feed-line angle, tuners,
>> etc, etc.)
>>
>> (My half sloper works reasonably well; I had little luck with an
>> off-center fed dipole years ago.)
>>
>> Bill - W2WO
>> _______________________________________________
>>
>>
>>
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>