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| To: | [email protected] |
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| Subject: | LF: Re: North Carolina Ice Strom / HBG plotting on hold |
| From: | "g6tmk" <[email protected]> |
| Date: | Mon, 9 Dec 2002 09:40:35 -0000 |
| References: | <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | <[email protected]> |
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Hello Dexter, and group,
Thanks for sharing the photographs - isn't nature
awesome !
While trying to find out about SAQ in Sweeden, I
came across a webpage all about "Radio Central", which was on Long Island, and
transmitted all round the world on LF frequencies. It said this:
Removing Sleet from Antenna.--One of the most interesting features of the station is the method by which sleet, that might form on the 25 miles of aerial wire in each aerial, is removed. With an antenna of such magnitude, the question of sleet on the wires is serious. This is taken care of by passing a current of 250 amperes at 1,500 volts through the antenna wires. Sufficient heat is generated to melt even the most severe ice formations on the wires in ten minutes. Small high-capacity condensers are connected in series with the antenna and tuning coils, to prevent the heat producing current from becoming grounded. The condensers have sufficient resistance to the 60 cycle current used for the above purpose, but readily allow the high-frequency current of the transmitter to pass through. It doesn't say what
they did if the mains electricity failed !
The URL is http://www.angelfire.com/nc/whitetho/1922RCA.htm It
has photographs of the antenna system and the Alexanderson
Alternators.
There is a considerable amount of interesting
information about the history of radio on this site.
73
Hugh
----- Original Message -----
From: "Dexter McIntyre W4DEX" <[email protected]>
To: "LowFER" <[email protected]>; "RSGB LF"
<[email protected]>
Sent: Friday, December 06, 2002 7:58
PM
Subject: LF: North Carolina Ice Strom / HBG
plotting on hold > who haven't seen the results of freezing rain here's a directory which > contains a few of the many pictures I taken in the past several days. > > http://www.gostanly.com/w4dex/pix/ice/ > > Your being able to access the server greatly depends on the current > state of the local power source and the current conditions of the UPS > batteries. Our power is back but the grid is occasionally being turned > down as other area are repaired. One estimate is that two million > customers have experienced commercial AC power loss. Presently the sun > is shinning and the ice is melting. > > Dexter > > > |
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