"Brenda Ann" wrote in message
...

That's XETRA.

At the time they IDed in Spanish as XERA-FM sin la letra "T"

No, they didn't.

I seem to remember their AM plant identifying in the early 70's as XTRA
(un-id?) The first AM stereo broadcast in some strange precursor of the
Kahn system (independant sidebands, you could listen in stereo using two
radios tuned to either side of the carrier)

That was how Arbitron, which couldn't (and still can't) accommodate calls of
more than 4 letters, listed them in the book... but they always ID'ed as
XETRA when they had to... most of the time it was "Extra" which is a name
that goes back to Gordon McLendon's early efforts at all news... "Extra News
over Los Angeles." That was the first all news station serving a US market,
around 1960, although the format was invented in Cuba around 1948.

When the news format failed, in part due to the border restrictions on
sending US programming to a foreign transmitter (thanks to Doc Brinkley)
they did Top 40 and Beautiful Music for the next two decades.