Alan wrote:
Huh? The addition of FM involved a VHF front end, a different mixer
oscillator operating in the VHF range, different mixers, a different
detector, and in those days, AFC functions to deal with the problem
that the local oscillator drifted.

No, I mean in terms of user interface.

'Course, I suppose in those days (early-mid 70s?) "internals" weren't
nearly as cheap as they are today.

Of course, in the San Francisco Bay area we are more likely to have
earthquakes than a tornado; earthquakes come with their own alerting system.

True enough. Though apparently you do occasionally get the same kind of
emergencies the rest of us do. One day, driving near Meridian,
Mississippi, I heard the EAS tones go off. Skies in Mississippi were
clear, with not a hint of severe weather. Announcer came on and said
"The National Weather Service has issued a severe thunderstorm warning
for...


Marin and Sonoma Counties in Northern California."


(it was a satellite-fed translator of a San Francisco station...)

--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com