Has anyone else noticed WBZ's unlistenable signal

[gic]

I'm hearing the noise on a regular Am car radio.

g

----- Original Message ----- 
From: "Garrett Wollman" <wollman@khavrinen.lcs.mit.edu>
To: "gic" <gary@garysicecream.com>
Cc: "Boston radio e-mail list" <boston-radio-interest@bostonradio.org>
Sent: Tuesday, January 18, 2005 4:22 PM
Subject: Has anyone else noticed WBZ's unlistenable signal


> <<On Tue, 18 Jan 2005 16:17:13 -0500, "gic" <gary@garysicecream.com> said:
>
>> During the day it is VERY noticeable when WBZ has their IBOC carrier 
>> turned
>> on - an annoying rushing sound is under all their audio.  How can they 
>> think
>> that this is an improvement to their signal!?!
>
> The IBOC sidebands are transmitted in quadrature, so it's invisible to
> envelope detectors.  Only people with synchronous detectors hear it.
>
> -GAWollman
>