Re: Concrete materials can act as a shorted turn

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "James Brady by way of Terry Fritz <teslalist-at-qwest-dot-net>" <james_brady10-at-hotmail-dot-com>

Why did the NSS have a coil room? What where they planning on doing with it?
Why did they need that much power?


jlb




----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, January 20, 2003 9:03 PM
Subject: Re: Concrete materials can act as a shorted turn


 > Original poster: "Ed Phillips by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<evp-at-pacbell-dot-net>
 >
 >  > ----- Original Message -----
 >  > From: "Tesla list" <tesla-at-pupman-dot-com>
 >  > To: <tesla-at-pupman-dot-com>
 >  > Sent: Sunday, January 19, 2003 4:39 PM
 >  > Subject: Shorted loops of concrete reinforcing effect res freq?
 >  >
 >  >  > Original poster: "Christopher Rutherford by way of Terry Fritz
 >  > <teslalist-at-qwest-dot-net>" <Christopher.Rutherford-at-comindico-dot-com.au>
 >  >  >
 >  >  > Hello,
 >  >  > I recently move my coil outside of my garage to run it and have
found its
 >  >  > working much better. I suspect that the loops in the steel
reinforcing
 >  >  > under the concrete of may garage may have loaded it??
 >  >  > I don't think I should have to retune it now that its had these
'shorted
 >  >  > turns' removed, is this right?
 >  >  > Basically only the Q has gone up? ...is this thinking right?
 >  >  > Cheers & thanks
 >  >  > Chris
 >
 > Back in 1946 I was working at Naval Research Lab in the Washington
 > area, and someone arranged a trip to NSS, a giant VLF transmitting
 > site.  One of the things we were shown was the loading coil room, which
 > I remember (that's quite a while back) as being a cube around 30 feet on
 > the side, with a hole in top for the lead in from the antenna; the coil
 > filled a good bit of the room.  Anyhow, the guy who was taking us around
 > had a story which may or may not have been true.  According to him when
 > the building was built and the coil first operated the floor buckled up
 > because of eddy current heating of the rebar!  It was rebuilt with some
 > other form of reinforcement.  Of course, those guys were running about
 > 500 kW at around 16 kHz, more than any home TC.
 >
 > Ed
 >