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Re: [TowerTalk] Barker & Williamson Model AC - 1.8 - 30 Antenna

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Barker & Williamson Model AC - 1.8 - 30 Antenna
From: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Wed, 6 Jan 2016 20:17:53 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Gotham back then sure made a lot of money selling a couple pieces of aluminum tubing and a taped coil. Ironically, even will a few radials and less than 20% efficiency users were able to work some DX on 80 meters. Whatever was left to radiate was at a low angle and sure a lot better than the B&W wire with a resistor to ground on the end. Actually compared to an inverted V at 50 feet on 80 the Gotham vertical might have beat it on DX every time.


Herb, KV4FZ

On 1/6/2016 6:34 PM, Larry Banks wrote:
Boxbe <https://www.boxbe.com/overview> This message is eligible for Automatic Cleanup! (larryb.w1dyj@verizon.net) Add cleanup rule <https://www.boxbe.com/popup?url=https%3A%2F%2Fwww.boxbe.com%2Fcleanup%3Ftoken%3DJzO1s5z64AYeFhCELFo731r3SsQrDWJiOxv%252BJS%252FCghGajeSRDdCZFq5MF6HVVFTcl4GZpOMHJi3Ft0quj2IVuhys2fyNr4qXkQ93jRUtriaSXZoU2XNr0P2wfR1Fn8SMYk8OuXTf4REghIcOHlmrrg%253D%253D%26key%3D7fbI4y9gKINGLRzuEGrK62RmwV2teaEjBb2NEdhkpaw%253D&tc_serial=23915332518&tc_rand=1759079109&utm_source=stf&utm_medium=email&utm_campaign=ANNO_CLEANUP_ADD&utm_content=001> | More info <http://blog.boxbe.com/general/boxbe-automatic-cleanup?tc_serial=23915332518&tc_rand=1759079109&utm_source=stf&utm_medium=email&utm_campaign=ANNO_CLEANUP_ADD&utm_content=001> In 1962, as newly minted novice KN1VFX, I purchased a Gotham V80. The ad said it was the best thing to work the world on 80M CW, and radials were not "required."

You can't beat physics! I've learned a lot since... (And I don't believe ads any more either.)

73 -- Larry -- W1DYJ




-----Original Message----- From: Herbert Schoenbohm
Sent: Tuesday, January 05, 2016 7:41
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Barker & Williamson Model AC - 1.8 - 30 Antenna





This B&W Antenna sort of reminds me of the infamous MaxCom antenna feed
which gave a VSWR of less that 2:1 from 1.8 to 30 Mhz sold for a while
in the 70's and 80's. After scamming thousands of hams with these claims
the ARRL lab put the potted matching unit into a X-ray device and
learned that it was nothing more that a series of toaster elements
across the feed point inside or a dummy load on the end of your coax
with some wire attached to it.  The B&W is sort of a throw back of the
TF2D military antenna which at least did a bit more radiating as a
folded dipole with a 600 ohms non inductive resistor in the center of
the top wire. Having said that most any end fed wire with a resistor to
ground at the far end makes for a quieter antenna on reception in many
cases. But again to market such a product without any clear indication
of what it really can do continues to be the way of many amateur antenna
devices sold to the unsuspecting.


Herb Schoenbohm, KV4FZ

On 1/5/2016 1:18 AM, Jim Brown wrote:
Boxbe <https://www.boxbe.com/overview> This message is eligible for Automatic Cleanup! (jim@audiosystemsgroup.com) Add cleanup rule <https://www.boxbe.com/popup?url=https%3A%2F%2Fwww.boxbe.com%2Fcleanup%3Ftoken%3Dget%252F6bxKLZEH4mXpr6hrXywuRG369DT%252BoS%252BO%252FjaEIgtFxT0YZb7ToZwgtnKjzHGZDpk4bR26ao%252F5cmj%252FQgQZcGY5uDN9DjYyC1XxpV3CUDuGiCFtZqMi4BFScIDerR7qzppjEHGf1UIdURKQli6lcQ%253D%253D%26key%3D51LY9nIpfzg%252FQmCV5bGH0AgjyTKvDVom%252BXGkogrvWPs%253D&tc_serial=23892835350&tc_rand=2089466478&utm_source=stf&utm_medium=email&utm_campaign=ANNO_CLEANUP_ADD&utm_content=001> | More info <http://blog.boxbe.com/general/boxbe-automatic-cleanup?tc_serial=23892835350&tc_rand=2089466478&utm_source=stf&utm_medium=email&utm_campaign=ANNO_CLEANUP_ADD&utm_content=001>
On Mon,1/4/2016 7:47 PM, john@kk9a.com wrote:
All I could find was a sketch so I'm not sure how it works.

John,

From the sketch on the Universal Radio website, I analyze it as a loop, formed by the wire, the ground rods, and the earth. The clue is that they tell you to add a wire between the ends if you're putting it on a roof.

73, Jim K9YC
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