Re: Listening to TC?

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

Original poster: "Jim Lux by way of Terry Fritz <teslalist-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

PC sound card, Spectrumlab program from Wolfgang Buescher (DL4YHF).. try
www.qsl-dot-net/dl4yhf

It's relatively easy to set up a frequency translator, decimator, etc. in
this program...  All you'll have to fight is the low frequency rolloff of
the sound card input, and the 44 kHz max sample rate and 20 kHz low pass...

If you've got some way to mix your input using analog techniques into
20-20k, then Wolfgang's program can help translate/display, etc.

Very nice work... It can generate text files too!


From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, June 22, 2003 7:37 PM
Subject: Re: Listening to TC?


 > Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<Mddeming-at-aol-dot-com>
 >
 > Hi Malcolm,
 >
 >         I don't think it does drop off. I think that coils should have
many
 > interesting "sounds" beyond human hearing range, which is why I'm trying
to
 > find the devices/references/parts to transform them into the audible
range.
 > The trick is to do it on limited income with home-brew equipment.
 >
 > Matt D.
 >
 > In a message dated 6/22/03 9:46:19 PM Eastern Daylight Time,
 > tesla-at-pupman-dot-com writes:
 >
 >
 >
 > >Original poster: "Malcolm Watts by way of Terry Fritz
 > ><teslalist-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>
 > >
 > >Hi Matt,
 > >
 > >On 20 Jun 2003, at 7:33, Tesla list wrote:
 > >
 > > > Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>"
 > ><Mddeming-at-aol-dot-com>
 > > >
 > > > Hi All,
 > > >
 > > >         We all know that spark gaps and streamers make some pretty
awesome
 > > > sounds, but what about "ultrasounds"? These would be sounds from 15KHz
on
 > > > up to the resonant frequency of the coil. This question is prompted by
the
 > > > following: Last night, a bat got into the instrument/people section of
the
 > > > lab. (The TC section is inside a grounded 10ftx10ftx8ft cage). With
the
 > > > coil running, the bat ran into the wall the way a bird or insect will
beat
 > > > against a window trying to get out. I turned off the coil and it
 > > > immediately turned around and flew back out the door which was only
open
 > > > about 5 inches.  Makes me think maybe the coil was making
sonar-jamming
 > > > noises. Of course, it could be pure coincidence.
 > >
 > >Why should the noise suddenly drop off at the limit of human hearing?
 > >;)
 > >
 > >Malcolm
 >
 >
 >
 >