That's crazy! If I understand you correctly, the booster could be made into the main transmitter, and the listeners wouldn't noticew9wi wrote:[img]http://www.w9wi.com/images/KRRN.jpg
Legal reasons. See the image. (assuming it works if not, try http://www.w9wi.com/images/KRRN.jpg )
We're looking at KRRN, 92.7MHz in Las Vegas. Legally, KRRN is NOT a Las Vegas station -- it's authorized to serve Moapa Valley, Nevada.
KRRN cannot locate its transmitter any closer to Las Vegas than it has. The lime green circle on the map is the interfering radius of the KRRN transmitter -- the area in which its signal is strong enough to interfere with stations KOMP (92.3MHz) and KYMT. (93.1MHz) The red circle is the area in which KOMP and KYMT are protected from interference. Note that the circles touch but don't overlap. Note the location of Las Vegas on the map -- at the outer edge of the area reached by the KRRN main transmitter. Note that there isn't much population within the green circle, except in the southwestern corner.
The irregular blue area is the area served by KRRN's booster. Note that this encompasses nearly all of the city of Las Vegas -- and not much else. Note mountains northeast of Las Vegas: the signal from the main KRRN transmitter is probably considerably weaker in the city than the green circle suggests. (if it wasn't, the booster would interfere with the main)
My point is.. most of the area covered by the booster is populated. Most of the area covered by the main transmitter isn't. The main transmitter must be located where it is because of FCC regulations. (I'm sure KRRN would rather its transmitter be located on the same mountain as KOMP and KYMT, but the regulations say otherwise) A booster won't be licensed unless it has a main transmitter to boost. (I'm sure KRRN would rather not bother building & operating the main transmitter, but they can't legally operate the booster if they don't)
So the main transmitter exists solely to justify the booster, and will be operated as cheaply as possible. The booster exists to reach Las Vegas, and it's worth investing in a circularly-polarized plant.
But even as-is, doesn't the booster itself have an interfering radius that is within the red circle, the area protecting KOMP and KYMT? Or is the booster's interfering radius much smaller, and will not penetrate Las Vegas, and can legally be ignored?