Has anyone else noticed WBZ's unlistenable signal

Stephanie Weil sven@gordsven.com
Tue Jan 18 16:35:38 EST 2005

On Tue, 18 Jan 2005, Garrett Wollman wrote:

> The IBOC sidebands are transmitted in quadrature, so it's invisible to
> envelope detectors.  Only people with synchronous detectors hear it.

English please?  And what radios have "envelope detectors"?


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