Thread: Baluns?
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Old September 2nd 08, 06:54 PM posted to rec.radio.amateur.antenna
John Smith John Smith is offline
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First recorded activity by RadioBanter: Nov 2006
Posts: 2,915
Default Baluns?

JB wrote:

...
There ya go.
One of the problems of breaking up the path to ground on the shield is that
now static can build up. If you can provide a way to bleed off the charges
that build up on both halves, while breaking up the shield currents, now you
have made it worthwhile. But when you guys start discussing off center fed
dipoles, I step aside. I have computers in the shack. I have better luck
with fan dipoles. Also running a Butternut vertical. Works a lot better
than a 4btv, but a pain to get it right on all bands.

Thanks

Also liked the other pdfs presented. I never have time to read them all
because of constant interruption around here. Back to work.



OCF antennas were not fully appreciated by me, a few of Cecils' helpful
insights and encouragement and I built one and was rather surprised ...
I do not have one right now but that is only due to neighbors/property
constraints.

Here is a URL for design/implementation of "non-standard"
baluns/transformers, but of a highly useable and desirable nature--or,
Dr. Sevick strikes again!:

http://www.highfrequencyelectronics....104_Sevick.pdf

Fig. 6(A) is very interesting. A 5-winding, 1:1.56 bootstrap
transformer which provides 50/75 ohm connections/substitutions. Perfect
for allowing one to use 75 ohm "junk" (or found in dumpsters) tv coax in
place of more expensive 50 ohm coax.

I have made good use of this since I have thousands of feet of NEW 75
ohm coax I purchased from a scrap dealer for next-to-nothing! A lot of
large dia coax and hard-line mixed in!

Regards,
JS