In article ,
Ian Thompson-Bell wrote:

David G. Nagel wrote:
Ian Thompson-Bell wrote:
Green Xenon [Radium] wrote:
Hi:

What would be heard on a 40 Hz AM DX receiver that uses the most
sensitive type of magnetic loop antenna? I doubt there would be any
hissing since that artifact would involve high-frequency sounds and a
40 Hz carrier cannot transport modulation-signals higher than 40 Hz
[violation of Nyquist theorem].

Not strictly true I think - depends on the modulation scheme - how
else do you think we manage to get 56K bps down a 3KHz phone line.

Cheers

IAn

Ian;

If it were possible to utilize 40hz at a high data rate it wouldn't take
15 minutes for the US Navy to send a 3 character message to it's
submerged submarines.

That's becuase the technology was developed ages ago.

Actually, the primary thing controlling VLF radio data rates is the
bandwidth of the antenna -- the signal just can't build up and decay
fast enough for a higher rate.

Isaac

"Richard Crowley" wrote:
You guys are all dupes who have fallen for "Radium"s
old tricks of asking insane questions and then sitting back
and laughing at people trying to make sense of them.

"Radium" is a notorious, long-time Usenet Troll. There
is absolutely no future in trying to reply to any of his/
her/it's questions.
Imagine this: Radium, Art, and Fractenna in the same room,
having a discussion about antennas. And of course you would
need someone to moderate,,, maybe Cecil.

Mike W5CHR
Memphis Tenn

Mike Lucas wrote:

...
need someone to moderate,,, maybe Cecil.

Mike W5CHR
Memphis Tenn



Naaa. You'd want the Dipole Dummy, complete with his full works of
articles/texts from the late 1800's clear into the early 1930's! ROFLOL

Regards,
JS

Mike Lucas wrote:
"Richard Crowley" wrote:
You guys are all dupes who have fallen for "Radium"s
old tricks of asking insane questions and then sitting back
and laughing at people trying to make sense of them.

"Radium" is a notorious, long-time Usenet Troll. There
is absolutely no future in trying to reply to any of his/
her/it's questions.
Imagine this: Radium, Art, and Fractenna in the same room,
having a discussion about antennas. And of course you would
need someone to moderate,,, maybe Cecil.

Mike W5CHR
Memphis Tenn


What are you trying to do, kill us with laughter? ;^)

Dave WD9BDZ

"Richard Crowley" wrote in message
news
"Dave" wrote ...
"Richard Crowley" wrote ...
You guys are all dupes who have fallen for "Radium"s
old tricks of asking insane questions and then sitting back
and laughing at people trying to make sense of them.

"Radium" is a notorious, long-time Usenet Troll. There
is absolutely no future in trying to reply to any of his/
her/it's questions.

who is trying to make sense?? its better, and more fun, to add to the
stupidness of it... much like answering art. a troll is a troll is a
troll... bait them and have fun.

Yeah, I like having nonsense fun as much as the next guy.
But "Radium" seems incapable of distinguishing between
nonsense and actual technical discussion. It just encourages him.
thats the whole idea!

Amateur Radio Study Guides say radio (carrier) waves start at approx. 20,000
hertz...............


"Green Xenon [Radium]" wrote in message
...
Hi:

What would be heard on a 40 Hz AM DX receiver that uses the most
sensitive type of magnetic loop antenna? I doubt there would be any
hissing since that artifact would involve high-frequency sounds and a
40 Hz carrier cannot transport modulation-signals higher than 40 Hz
[violation of Nyquist theorem].

I also don't think power lines would have any perceptible affect on a
40 Hz receiver. In USA, the electric power has a frequency of 60 Hz --
in Europe, its 50 Hz. Since 40 Hz is below these power frequencies, I
doubt they would cause interference on 40 Hz. If I was receiving at or
above the power frequencies, I do think there would be disturbance but
not if below.

Would any interferences from outer space be perceptible on a 40 Hz AM
receiver? Galactic noise?


Thanks,

Radium

"Rollie" wrote in message
...
Amateur Radio Study Guides say radio (carrier) waves start at approx.
20,000 hertz...............


"Green Xenon [Radium]" wrote in message
...
Hi:

What would be heard on a 40 Hz AM DX receiver that uses the most
sensitive type of magnetic loop antenna? I doubt there would be any
hissing since that artifact would involve high-frequency sounds and a
40 Hz carrier cannot transport modulation-signals higher than 40 Hz
[violation of Nyquist theorem].

I also don't think power lines would have any perceptible affect on a
40 Hz receiver. In USA, the electric power has a frequency of 60 Hz --
in Europe, its 50 Hz. Since 40 Hz is below these power frequencies, I
doubt they would cause interference on 40 Hz. If I was receiving at or
above the power frequencies, I do think there would be disturbance but
not if below.

Would any interferences from outer space be perceptible on a 40 Hz AM
receiver? Galactic noise?


Thanks,

Radium


What about VLF communications from submerged submarines? They work at, would
you believe, Very Low Frequencies, a lot lower than 20kHz.

S.
--
http://audiopages.googlepages.com

Green Xenon [Radium] wrote:
Hi:

What would be heard on a 40 Hz AM DX receiver that uses the most
sensitive type of magnetic loop antenna?

Around 40 Hertz, tops.


- 73 de Mike N3LI -