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Engineering Question

U

unclepudd

After noticing that KMOX St. Louis (50k, 1120 AM) was again to be the home of the Cardinals, I looked up it's coverage and found something which puzzles me. They are 50k full time non-directional with one tower yet show TWO patterns. Maybe I'm so old school that something magical has been invented. How is this possible?

Thanx in advance!
 
unclepudd said:
After noticing that KMOX St. Louis (50k, 1120 AM) was again to be the home of the Cardinals, I looked up it's coverage and found something which puzzles me. They are 50k full time non-directional with one tower yet show TWO patterns. Maybe I'm so old school that something magical has been invented. How is this possible?

Thanx in advance!
Click to expand...

If you go to the source, the FCC, you will see this listing:

http://www.fcc.gov/fcc-bin/amq?list=0&facid=9638

And the listing shows a day and night operation with identical parameters (single tower, same height, same coordinates) as shown by the field strength at 1km which is the same.

If you look anywhere except the FCC site, you run the risk of getting second hand data.
 
DavidEduardo said:
And the listing shows a day and night operation with identical parameters (single tower, same height, same coordinates)
as shown by the field strength at 1km which is the same.
Click to expand...

Also in the FCC data:
"ND2 - Non-directional Antenna: Different constants day and night"

What are the "different constants"? And as you said, (the other) parameters are
identical, so why the need for separate day and night listings?
 
oldiesfan6479 said:
DavidEduardo said:
And the listing shows a day and night operation with identical parameters (single tower, same height, same coordinates)
as shown by the field strength at 1km which is the same.
Click to expand...

Also in the FCC data:
"ND2 - Non-directional Antenna: Different constants day and night"

What are the "different constants"? And as you said, (the other) parameters are
identical, so why the need for separate day and night listings?
Click to expand...

Constants are the antenna impedence, reactance, common point (or single tower) antenna current with and without modulation.

If the station has a different pattern, it would be listed as separate patterns day and night.
 
Just scanning the dial, I heard KMOX in Dallas a few nights ago.
 
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