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

Herbert Schoenbohm herbert.schoenbohm at gmail.com
Wed Jan 6 19:17:53 EST 2016


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:
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>
> 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 at 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:
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>> On Mon,1/4/2016 7:47 PM, john at 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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>>
>>
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