In my system, in the radio...

[Esteban]

... is the phase shift.

Exactly as I made with a FM radio since more than 20 years ago! So, IR can be used for electronic LRL.

[Fred]

you should read it again Esteban

[J_Player]

Originally Posted by Fred

you should read it again Esteban

You mean an FM radio cannot receive acoustic waves?

Best wishes,
J_P

[Esteban]

Originally Posted by J_Player

You mean an FM radio cannot receive acoustic waves?

Best wishes,
J_P

Of course, in the paper is used microphone, but in radio appears variation in tone. I use other way. How many times I'll repeat it?

[Fred]

Now i am a skeptic

[Esteban]

Originally Posted by Fred

Now i am a skeptic

Congratulations, you're in the correct point!