[Antennas] RE: De-Icing Open Wire
Bob Wilder
[email protected]
2002年12月12日 15:50:23 -0600
Thsnks for correction---see that everyone is wide awake. Even though a
folded dipole
is a resonant antenna, I will work one more than one band when used with a
tuner
At 02:38 PM 12/12/2002 -0600, Karl Kanalz wrote:
>Not quite true, Bob ---
>>A true "doublet antenna" is nothing more than a dipole, with one leg
>connected to each side of that 600-ohm feed-line! For RF, it is a "closed
>circuit" but at 60 Hertz, it's an OPEN CIRCUIT.
>>I now wonder just how it worked at such low frequencies, since a 135-foot
>doublet isn't resonant anywhere near 60 Hertz....
>>Karl (now "Framistan") K - W8TIF
>McKinney, Texas
>>-----Original Message-----
>From: Bob Wilder [SMTP:[email protected]]
>Sent: Thursday, December 12, 2002 7:39 AM
>To: [email protected]
>Subject: [Antennas] Open Wire
>><snip> The beauty of this antenna was that in
>severe icing conditions Wilson would connect a 10V, 20amp filament
>transformer across
>the 600 Ohm open line and melt ice off of his antenna. Remember that a
>doublet is a closed circuit, so the antenna appears as a short to the
>transformer.
>><snip>
>>Bob Wilder, AF2HD/AFA2HD
>6032 Idlemoore Court
>Theodore, AL 36582-4117
>>>>>---
>Incoming mail is certified Virus Free.
>Checked by AVG anti-virus system (http://www.grisoft.com).
>Version: 6.0.427 / Virus Database: 240 - Release Date: 12/6/2002
Bob Wilder, AF2HD/AFA2HD
6032 Idlemoore Court
Theodore, AL 36582-4117
251-653-5274
http://home.earthlink.net/~bwild
All incoming and outgoing messages
virus checked with AVG version
6.0.427 Virus database 240 updated
12/6/2002 Get your FREE copy at
http://www.grisoft.com
--- StripMime Report -- processed MIME parts ---
multipart/mixed
text/plain (text body -- kept)
The reason this message is shown is because the post was in HTML
or had an attachment. Attachments are not allowed.
Please post in Plain-Text only.---