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A comment on Congress fights to keep AM radio in cars. Parent comment

Re:Congress fights to keep AM radio in cars by vel0city on Sunday October 06, 2024 @11:04PM (#41762410)
AM radio reception on a headphone wire is pretty bad. I've had a few small radios designed to get commercial AM/FM using the headphones as antennas; the reception is almost always very miserable.

Meanwhile commercial FM is like ~3.5M wavelength; you're pretty close to a quarter wave with a normal headphone wire (~3ft).

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Re:Congress fights to keep AM radio in cars by carlmr on Monday October 07, 2024 @04:03AM (#41763751)
>you're pretty close to a quarter wave with a normal headphone wire (~3ft)

You mean half-wave, right?

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Re:Congress fights to keep AM radio in cars by boomlinde on Monday October 07, 2024 @06:44AM (#41764681)
3.5 m is almost 12 feet, so 3 feet is almost a quarter wave.
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Re:Congress fights to keep AM radio in cars by carlmr on Monday October 07, 2024 @11:20AM (#41766892)
Ah, my bad, didn't convert feet properly in my head. Not used to it.
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Re:Congress fights to keep AM radio in cars by vel0city on Monday October 07, 2024 @11:35AM (#41767056)
I'll take half the blame for using such measures interchangeably in a single sentence.

The metric system is the tool of the devil! My car gets forty rods to the hogshead and that's the way I likes it!

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