Subj : Re: Toroids
To : Ed Vance
From : claw
Date : Mon Dec 23 2024 07:56 am
On 19 Dec 2024, Ed Vance said the following...
EV> When I was in the Navy, one of the antennas on a aircraft carrier was a
EV> Discone, it was a HUGH antenna.
EV> Several Transmitters used that antenna.
EV> There were separate Antenna Tuners for each TX, and the best I can
EV> recall is the output from several Antenna Tuners all went to that
EV> antenna.
EV>
EV> This Discone was for HF not VHF or UHF.
EV> It had several wires strung from the top of it at an angle to the
EV> center and then slanted back towards its base.
EV> Usually the Discone was mounted vertically except when Planes were
EV> landing when it was hinged 90 degrees and operated horizontally.
EV> I didn't think to do a search for a webpage with a photo of the antenna
EV> to help you visualize it .
EV> I think the Discone was 20 foot high and the center of it 3 or 4 feet in
EV> diameter.
EV> The top and base was about 20 inches in diameter.
EV>
EV> Not really a antenna a Ham would use, I am mostly writing about it
EV> because several HF Transmitter/Antenna Tuner were all using the same
EV> antenna for transmitting.
EV> The Discone wasn't the only antenna used for transmitting, the Ship had
EV> many verticle antennas that were connected to Transmitters in another
EV> compartment aboard Ship.
EV>
EV> Where I lived TV Antennas were fed with Plastic 300 Ohm twinline.
EV> When I was in San Diego California I saw TV Antennas that used Open Wire
EV> Twinline instead of the plastic line.my area used.
EV> Maybe it cost less to use open wire line than what I was familiar with.
EV>
EV> There were a couple of Hams that used Open Wire feedline and a Antenna
EV> Tuner to a HF Dipole, but most Amateurs I knew used coax (me too).
EV> Ed W9ODR
Really cool story! In the end What my Elmer taught me is if I am making Dipoles and they are resonant, I don't need a 1:1 Balun and would be better off just choking out interference instead. I have been using my Fan Dipole now quite a bit and aside from needing to tune 2 ends of 10m just because of it's size it works just find without a balun. I do have a bit of interference to choke out still but I will get there.
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