[TowerTalk] Off Center Fed Antennas

[Larry Loen]

As long as we're talking OCF antennas, I've always found this an
interesting source as far as explaining them:

http://www.w8ji.com/windom_off_center_fed.htm


Larry Wo0Z

On Tue, Jun 4, 2013 at 2:04 PM, Patrick Greenlee
<patrick_g at windstream.net>wrote:

> When fishing not every lure or bait works well for everyone every time but
> if you eliminate everything that isn't working 100% of the time for 100% of
> the users what do you use, what is left?
>
> Recommending against a Carolina Windom or off center fed dipole because
> sometimes they don't work well for some people in some situations seems
> overly limiting.  Need a sure thing first time every time?  Try AT&T and a
> corded phone.  an OCF dipole is just some wire 'n' stuff.  Let folks try it
> without bias and if it doesn't please them then... it is mostly just wire
> and it can be used to try a different configuration. For some folks there
> is more to our hobby than shouting "CONTEST CQ CONTEST" or bragging rights
> when your StepIR  up way over 100 ft driven by a full legal limit (+) amp
> lets you break a pile up so you and someone where there aren't many hams
> can shout 59 at each other.
>
> Patrick AF5CK
>
> -----Original Message----- From: Jim Brown
> Sent: Tuesday, June 04, 2013 1:22 PM
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] Off Center Fed Antennas
>
> On 6/4/2013 9:54 AM, Bill Ogden wrote:
>
>> It might be fair to say there are more environmental considerations for
>> these antennas than for a simple dipole or quarter-wave vertical.
>>
>
> This is a good assessment, and is the basis for my advice to avoid them.
> Those environmental considerations are primarily 1) the proliferation of
> RF noise sources that the feedline then couples to the antenna, and 2)
> the proliferation of electronic equipment (including ham gear) that is
> susceptible to RFI.
>
> Long wires that end in the shack and most verticals suffer from the same
> issues, both because they are vertically polarized (and lots of noise is
> vertically polarized), and because they are closer to noisy and
> vulnerable equipment.
>
> My point about these off-center fed antennas is that if you can rig one
> of them, you could almost always rig a symmetrical antenna that will
> work as well or better. And if you can rig a resonant antenna, it will
> have a predictable pattern that you can make use of to get GAIN in one
> or more desired directions.
>
> 73, Jim K9YC
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