[BC] While you are waiting for receivers

[KNCN674@aol.com]

Yes the AM stereo blend and variable bandwidth on the MC13022 and others 
provided a way to reduce the 10 khz whistle. The stereo blend was soft and based 
on the negative "I" component and signal strength which also prevented platform 
motion due to co-channel interference. The Neg "I" feature gave a super way 
to do accurate seek/scan by stopping on "good" signals not just strong signals. 
These fuctions were done with Analog circuits. Later versions of the 
chip-setused DSP that emulated the analog blend and quality functions. Many Chrysler 
car radios (millions) continued to use the seek scan and variable bandwidth 
functions (and AM stereo disabled) up 'till the early 2000's.

On the FM stereo blend issue -- my car radio (2002 Jeep) begins to blend to 
mono at 65 miles from our C2 station (mountain top running 640 watts ERP).  GM 
tends to blend much earlier at about 40 miles.

Rich KRDE