Sunrise, Sunset

AM Stations go a LOT further at night than in the daytime; so we must change power as well as the directions we shoot the signal when the sun sets.
If we didn't, our extended signal could hurt other stations also on 1150.

And the other stations change power as well, to make sure they don't interfere with us.

Some stations, called 'daytimers' just plain have to go off the air at sunset.
They come back on in the early morning.

This is the Control Computer that switches the AM from Day to Night Pattern when the sun rises and sets ... The Time Changes each month and is mandated in the Station License.

In days of yore, the F.C.C. required that ANY broadcast transmitter that was on the air have a licensed engineer in attendance. Someone there, watching it to make sure it was operating properly. If the station was on 24 hours, then the engineer had to be there 24 hours. Great job for a student - lot's of time to sit and do homework. All you had to do was write down a set of meter readings every 30 minutes. And, twice a day, you had to manually switch from day to night pattern and back again. These days, it's usually automated.

But the switch must still be done within 2 minutes of the times mandated in the station license.

This is the First Class Radiotelephone License the F.C.C. used to require of a Broadcast Engineer. It's now obsolete and no longer required. Rather, it's the responsibility of the licensee to make sure his people are qualified.

Copyright 2005 by Vital Sounds - ALL RIGHTS RESERVED