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
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|