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Biggest Antenna on the Planet

WECSOG

Sr. Member
Jan 1, 2020
756
1,346
153
"Jim Creek achieves its worldwide range by transmitting a very powerful, very low frequency (VLF) signal, one with a wavelength of approximately seven miles and a frequency of only 24.8 KHz."

That power and frequency is very alarming to wildlife in the ocean and proves the claims it harmed thousands of dolphins, is absolutely true! This frequency range is dead center in the dolphins normal hearing bandwidth which extends to 50Khz. Obviously we need to communicate but don't pretend it didn't have consequences.

PS: Your dog can hear to 45 Khz. Wonder how they behave around that transmitter site? This transmitter is essentially a high powered, modulated dog whistle.
I seriously doubt they can hear it. If they could, we could hear the powerlines at 60 cycles. And consider the amount of power going through those.
 

Shockwave

Sr. Member
Sep 19, 2009
3,786
3,286
273
I seriously doubt they can hear it. If they could, we could hear the powerlines at 60 cycles. And consider the amount of power going through those.

Keep in mind, we are told line frequency does not radiate at 60 cycles. On the other hand 24,800 cycles, seems to radiate enough for the signal to have a global reach...

Check out stories of "beached dolphins and whales during VLF testing". It's no coincidence that our Navy sonar and VLF radio communications mimic sea mammals because it is known they they can communicate over 800 miles. They don't use 2,000 kilowatts to do it either, and these man made systems are basically, on their channel because we found out how well it works.

Sharks have attacked the sonar transducers operating at this frequency on US submarines. Cookie cutter sharks have pinpointed the sonar transducers and totally destroyed them by biting until the sound stops. How do we define what is sound and what is RF when the frequency in use, is both?
 
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TheBlaster

Well-Known Member
Jun 29, 2020
270
278
73
"Am I getting out ?" The most energy efficient antennas, 4W in 2KW out lol (joke). Very impressive.

Regarding the lower frequency TX, that would need to breach the electromagnetic / acoustic planes to affect dolphins. I am not saying it did not. Did it directly stimulate the auditory nerves in their brains that are optimized for those frequencies ?(given our nervous system/brain activity is electrical impulses)
 
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Big Kahuna

Sr. Member
Jul 31, 2008
1,097
1,974
173
Big Kahuna,
Jim Creek has been doing some testing in the last 5 months or so, off and on. I yak with a guy that lives close to there in Arlington.
John says that his radio is use less at times on several of the bands, lots of heterodyne comes from Jim Creek.

Interesting. I always knew it was there but I remember a year or two ago Russia said it was one of their missile targets and I looked it up on google maps and the scale of those wires and towers just blew me away. That entire valley is a giant antenna.
 
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Captain Kilowatt

Professional Amateur
Staff member
Apr 6, 2005
16,876
11,064
823
59
Nova Scotia,Canada
Remember that the 24 kilohertz signal is a RADIO WAVE. Human ears may be able to hear an AUDIO WAVE at that frequency, but human ears cannot hear a radio wave unless there's a radio to receive and process it. No aquatic mammals have been harmed by RF.


Exactly. One causes compression of the air to make sound while the other excites electrons to generate RF. Quite a different situation.
 
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secret squirrel

Lustrous Potentate
Oct 5, 2008
535
1,123
153
Washington, PA
You guys remember when the urban legend was going around that one of the radar techs in Alaska, would tune one of the HAARP arrays, High Frequency Active Auroral Research Program, to 11 meters and talk on channel 19. I remember hearing this one more than once that it was the origin of the phantom "I an't got no panties on." It was a guy talking on a HAARP array.
 

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Beetle

Sr. Member
Dec 7, 2005
3,059
1,112
173
Western Washington
In December 1966 I received orders for two weeks' Naval Reserve annual training at Jim Creek. As a Radioman second class, this was a dream assignment. The orders included a map on how to get there, and to report to the Operations Officer when I arrived. Turned out he had been my Division Officer for two years on Kitty Hawk, and he had personally pushed my orders through the maze.

Another interesting VLF antenna is at the very tip of North West Cape, Australia. Browse with Google Earth and look for a hexagon with sides over a mile long. That's the place: named after Harold E. Holt, an Australian Defence Minister, I believe.
 

fogdog

Sr. Member
Aug 29, 2013
509
636
103
East Tennessee Mountains
Hi Folks
Just wondering if anyone's seen the new antenna that Motormouth Maul has just put up. I've never seen anything like it before. It has a 117 foot long boom and 16 elements on 27Mhz! Iv'e seen big antennas before but nothing like this. https://www.computer7.com/the-biggest-cb-antenna-on-the-planet/
biggest-cb-antenna-large.jpg

Probably takes a 350 V8 as a rotor control motor. Lol
 

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