[TowerTalk] TowerTalk If you had a choice

[Bill Winkis]

When everyone is licensed they should get a free copy of "Yagi Antenna
Design", by the late Jim Lawson. It would eliminated a lot of mistakes and
growing pains..
For instance....
Per Mr. Lawson:
A yagi antenna at 50 feet on 20 meters, would give you two take off
lobes..one at 18 degree's the other at 63 degrees.
Now move the antenna up to one wavelength over ground and now you still have
two lobes, one at 15 degrees and one at 48 degrees.
Now go up to two wavelengths above ground and now you have 4 lobes, one at 7
degrees. one at 20 degrees, one at 37 degrees and the last at 60 degrees.
So, good show on the antenna, but you'll wonder why your neighbor is
opening the band with his 2 wl antenna and you're wondering who he is
talking to, with your 3/4 wl antenna... 
What did the wise old "Elmer" say ...Son, put 1/3 of your money into a
tower, a third into the antennas, and a thirds into the radio and
peripheral's

Bill ... KC4PE
http://www.kc4pe.com/amateurshack.htm.


-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of David
Gilbert
Sent: Tuesday, October 16, 2012 1:43 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] TowerTalk If you had a choice


And yet, incredibly, the Mosley specs for the Pro 57B say it has 8.5 db 
gain over a dipole (dBd) on 20m/17m/15m/12m with only three elements per 
band.   By comparison, Optibeam claims 8.5 dBd for their 5 element 20m 
monobander on a boom twice as long as the Pro 57B.

http://www.mosley-electronics.com/spec%20files/amateur/pro57b.htm

No way on earth that three elements would be capable of 8.5 dBd, but 
apparently such unfounded claims sell antennas anyway.  I don't dispute 
that the Pro 57B is durable, but that's like bringing a 1950's era 
Schwinn cruiser to a modern bicycle criterium race.

Dave  AB7E




On 10/16/2012 7:08 AM, K7LXC at aol.com wrote:
>>   If you had a choice between antennas which would you  choose a Mosley
> Pro 57B 3 inch boom or Cubev 4 element 5 band quad. Both would  be mounted
at
> 50ft. I do not have modeling software to compare. Thoughts?????
>
> According to our landmark on-the-air tribander  test, the Mosley PRO
> antennas underperformed the competition. In one case, it  even had
negative gain
> on one band. I'd suggest any antenna over a Mosley.

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