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[Discuss-gnuradio] working AM radio - critique

From: Skip Marsden
Subject: [Discuss-gnuradio] working AM radio - critique
Date: Wed, 25 Aug 2004 08:30:50 -0500

A quick note: Common FCC allowed practice in AM broadcast is positive modulation
with peaks to 125% with negative peaks not exceeding 100%.

Low end frequency response of modern transmitters is 50Hz @ -1dB referred to
400Hz or 1kHz.  Some go to 30Hz easily.

I believe things are a bit different for C-Quam AM stereo where the L-R information is phase modulated on the carrier, thereby limiting negative modulation to less than
100% to prevent carrier cut off.


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