[TowerTalk] Return on investment (golden rules) for antennainstallations

[Mike Ryan]

Must be a slow week, ALREADY. Are we going to beating this dead horse again 
about MOSLEY (not Moseley) antennas? ...really? -m

-----Original Message----- 
From: Kelly Taylor
Sent: Sunday, January 10, 2016 11:58 AM
To: Joe Subich, W4TV
Cc: dw ; [TowerTalk]
Subject: Re: [TowerTalk] Return on investment (golden rules) for 
antennainstallations

It was intended to compare to the specific Moseley model, a disclaimer the 
author clearly makes. He didn’t optimize the antenna because Moseley didn’t, 
either.

He also admits he ignored the other lumped inductances in the actual 
antenna, which probably hampers 20m efficiency even more than his model 
represents.

I suspect that particular Moseley was designed to appeal to folks 
transitioning out of a ground-mounted vertical, for whom the Moseley would 
appear to be a big upgrade, primarily for being up in the clear rather than 
for any electrical advantages over a dipole.

73, kelly
ve4xt

> On Jan 10, 2016, at 10:16 AM, Joe Subich, W4TV <lists at subich.com> wrote:
>
>
> The model used for the yagi is far from optimum and contains losses
> not likely to be present in a well designed antenna.  The losses in
> a half size element are typically less than 0.5 to 1 dB unless the
> loading/matching circuits have extremely low Q.
>
> That said, Moseley antennas have been found to be quite inefficient in
> actual range tests (see the W0AX/K7LXC tribander books) to the point
> of showing loss compared to a dipole on some bands.
>
> 73,
>
>   ... Joe, W4TV
>
>
> On 1/10/2016 9:27 AM, dw wrote:
>> I read an interesting article in eham where EZNEC was used to compare a
>> specific commercial beam to a dipole.
>> I guess I was a little surprised at the results.
>> The article is here.
>>
>> http://www.eham.net/articles/35421
>>
>> It goes to the question of whether or not a given antenna solution
>> represents an improvement significant enough to warrant investment.
>> I wonder how others formulate return on investment considerations.
>> Perhaps years of experience, and some "been-there-done-that", have
>> allowed you to develop some golden-rules about antennas?
>>
>>
>>
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