TacTurtle t1_iu6fhd4 wrote

The actual generation and radio equipment could fit in a couple shipping containers or a small building, it is the antenna that is big.

3MW is small enough power you can get them as pre-packaged skid-mounted units like https://www.westernstatescat.com/power-systems/electric-power/gas-generator-sets/cg260-12-2100kw-3000kw3mw-gas-generator-2/

Example: check out this weather radar array - radar is radio broadcast and receive, just at much higher frequency. WSR-88D weather radars for reference are almost 1MW. The Wisconsin ELF was 2.6Mw.


TacTurtle t1_iu6da7f wrote

If you want an absolutely fascinating podcast, check out the Fighting Through Podcast, episode 13, it is an episode dedicated to some Blitz bomb disposal memoirs.

“Imagine the shock when your pick clangs against steel. You wonder if you have started the clock ticking. On your knees, you use a trowel to carefully uncover the bomb." - Brian Moss, Platoon Sergeant in 233 Field Company, Royal Engineers.


TacTurtle t1_iu6bn25 wrote

It is actually more that the wavelength for extremely low frequency radio requires extremely long antennas for efficient transmission and reception - not an electrical hardware size issue.

Wavelength = speed of light / frequency so as frequency goes down, wavelength (and antenna size) go up.

Subs use a long antenna cable they can extend and tow behind underwater for ULF radio transmission and reception.

Faster transmission with a shorter antenna requires getting closer to the surface for higher freq radio which will not penetrate water as easily.