General Discussion

ultralite001

(2,873 posts) Thu Jul 9, 2026, 10:24 PM 4 hrs ago

Put me in, Coach...

I'm ready to play... today...

The "old" Air Force 1...

This faithful workhorse is called off the bench in service to America...

[w/ thanks to John Fogerty + "Centerfield"...]

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3 replies

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Put me in, Coach... (Original Post) ultralite001 4 hrs ago OP

I suspect it's because of the (alleged) new threats on his life by Iran. usonian 4 hrs ago #1

I'd passed over that graphic before. The trailing antenna is 5 miles long? underpants 4 hrs ago #2

VERRRRRRRRRRRY low frequencies to penetrate through a lot of water. usonian 3 hrs ago #3

usonian

(27,459 posts)

1. I suspect it's because of the (alleged) new threats on his life by Iran.

Reply to ultralite001 (Original post)

Thu Jul 9, 2026, 10:33 PM

4 hrs ago

New plane doesn't have all the James Bond gear.

Soon, we may see this one:

(you may have to wait)
Note: Both imgbb.com and postimages.org are excruciatingly slow for me tonight.

underpants

(198,012 posts)

2. I'd passed over that graphic before. The trailing antenna is 5 miles long?

Reply to usonian (Reply #1)

Thu Jul 9, 2026, 10:43 PM

4 hrs ago

I had no idea.

usonian

(27,459 posts)

3. VERRRRRRRRRRRY low frequencies to penetrate through a lot of water.

Reply to underpants (Reply #2)

Fri Jul 10, 2026, 12:13 AM

3 hrs ago

demand a very long wavelength, hence antenna.

That's actually short for the wavelengths and frequencies involved.

https://en.wikipedia.org/wiki/Communication_with_submarines

Electromagnetic waves in the ELF and super low frequency (SLF) frequency ranges (3–300 Hz) can penetrate seawater to depths of hundreds of metres, allowing signals to be sent to submarines at their operating depths. Building an ELF transmitter is a formidable challenge, as they have to work at incredibly long wavelengths:

stuff about ground-based transmitter projects from the past ...

The usual half-wavelength dipole antenna cannot be feasibly constructed, as that would require a 1,800 km (1,100 mi) long antenna.

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