> > > I wonder from both the technical and
> > > marketing perspectives.
> >
> > I'd also like to know some of the technical
> > setups-./SNIP/Did the guy at the
> > local AT&T testboard switch the network
> > during a station break?
> >
> I worked for three Texas stations in the 1980s that were
> affiliates of more than
> one network. The answers are slightly different in each
> case.
>
> KXII in Sherman, Texas/Ardmore, Oklahoma, was a CBS primary
> station, and NBC secondary. CBS came from a Western Union
> line. NBC came from a direct line from KXAS in Fort Worth.
> I say "direct," but that's not quite the case. The station
> had a microwave shack halfway between Sherman and Dallas
> where we received both signals. We sent a remote control
> signal via radio to make the switch from CBS to NBC and to a
> backup CBS signal--KDFW off-air.
>
> Since we could only receive one network signal at a time, we
> could either air the show when it fed on the network, or not
> at all. We couldn't air one network while taping another.
>
>
> At KLTV in Tyler, we were primarily an ABC station, but we
> took football, News at Sunrise and Late Night with David
> Letterman from NBC, and football from CBS. On Sundays, it
> was very common for us to take a Houston Oilers game from
> NBC at noon, then switch to a 3:00 Dallas Cowboys game from
> CBS. In our case, it all came from Western Union. We would
> have to call them during a station break and get them to
> switch from CBS to an NBC feed from AT&T and back to ABC.
> It all fed to a microwave shack in Kaufman, Texas, where, by
> remote, we could also switch to off-air signals from the
> major channels in Dallas, as a backup. There was one other
> backup you'll see in a moment. It changed a bit when we got
> satellites.
>
> KTRE in Lufkin was a semi-satellite of KLTV. We ran local
> newscasts and local commercials, but all of our network and
> syndicated programming came down a microwave from KLTV.
> Sounds simple enough, but if KLTV had a problem with the
> network feed, KTRE wouldn't necessarily know what was going
> on. Their backup was the Houston stations. They shared the
> microwave system with the local cable companies that brought
> signals in from Houston. It usually looked pretty good.
>
> KLTV could receive KTRE's signal off air. So in a real
> pinch, KLTV might acutally air KTRK's signal, via KTRE. It
> looked horrible.
>
> All three stations had previously been NBC primaries, but I
> suspect the basic systems worked about the same.
>
I'm not an engineer; I do know that I lived in two markets where
there were stations with multiple affiliations at the time:
Raleigh/Durham and Birmingham, and that in both cases all stations
involved could air one network and tape the other; I remember, for
example, that Birmingham's Channel 42 (CBS primary, NBC secondary)
used to air Ed Sullivan live from 7-8 (CT) on Sunday, and tape
The Mothers-In-Law (7:30) for airing immediately after Sullivan.
Channel 13 (NBC primary, CBS secondary) used to air Bonanza on
pattern and tape The Smothers Brothers Comedy Hour, and Durham's
Channel 11 (CBS primary, NBC secondary) used to run Gunsmoke and
Here's Lucy on pattern and tape Laugh-In.
But I don't know whose line they used (Western Union, microwave
from Atlanta, or what). I do suspect that WBRC (ABC in Birmingham
at the time) did use a microwave from Atlanta's Channel 11 (also
ABC at the time), since 11's station ID came in on WBRC one Sunday
night.