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Tx on all 40ch at once

It does have one practical use. Someone who would otherwise get his ears plugged won't give away what channel he's listening to. If you hear him on dozens of channels, which one do you choose to key on his receive?

Unless you can also hear who he's talking to. That would give it away.

Our original promotional name for this was
Analog
Spread
Spectrum.

The three-letter acronym speaks for itself.

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