radiodavid wrote:


Critical Hours operation is required of only a very few stations in
the US, mostly ones that wanted high powers and were willing to
sacrifice some of that in the post sunrise and pre sunset hours.
Critical Hours is a recent development, and I can't remember when it
started being allowed but it was likely it was in the 80's,


When I was a kid, KYND Tempe, 1580, was 50 KW ND from 10 AM to 3 PM,
from Sunrise to 10 A and from 3P to Sunset they were 10 KW. This would
have been 1964.

Buck Owens owned the station for a while. Dick Gilbert put it on the air.

We used to do pirate radio on it after midnight, on full power, during
the "Experimental Period". (look that up)