Bill Drake said:
I have see NOTHING from you that bears any relevance to reality. Your comparisons of 740 and 710 in the LA market are completely at variance with 1480 and 1510 in Phoenix. One is 22kw and the other is 5kw. Quite a different from LA. The frequencies 710 and 740 are also completely different than 1480 and 1510.
All the examples are stations in the same market with 30 kHz separation. And, as I said, there are many, many examples of such same-market 30 kHz separations at all kinds of power levels all across the US.
I am not interested in your recollections of stations long ago owned. I note all your experience seems to be in the PAST. None of your statements regarding stations in third world countries can be proved at this point.
The statements in the form of published station lists and such are readily available, as are related documents like ratings and such. In any case, the laws of physics have not changed in the last few years...
Neither can your ludicrous statement about today's consumer grade AM receivers being able to easily distinguish short spaced stations. I have two Sangeans and a Radio Shack receiver and 20HZ is a real challenge; I would dare say impossible. Even 30HZ is a stretch. Where do you get these magic radios?
As I said, I have carried a variety of Tecsuns, Sangeans and Sony's to places where there are operating 20-kHz separation stations and I have not had a bit of trouble. The fact that the Mexico City example cited has existed for over 50 years should prove that there is no issue. In fact, the one-in-the-middle is operated by a government entity and, wouldn't you suppose, the government would find a solution were a problem to exist. Of course, none exists.
So YOU never received any complaints regarding short spacing. Were these stations of yours operating with equal or near equal power with transmitters spaced far apart or near by? I don't see any of the ones listed operating above 1280kHz. That too makes a big difference from stations short spaced in the 1400 or 1500s.
In the case of 590 and 570, they were both initially 1.5 kw and spaced at almost opposite ends of the Quito metro, about 25 km apart. They later increased to 5 kw and there was no issue. The 570 station had, initially, a 5 kw neighbor at 550, located about 18 km to 20 km away. It never interfered in any populated area, and all three stations were right on the edge of the city, as law required.
I got tired of listing stations, but there was 1310 and 1330, and 1410 and 1430, a skip to 1470 and 1490, then 1520, 1540, 1570 and 1590.
I have noticed from all of your posts that when Emperor Eduardo says something, that's it; end of any discussion.
When you, specifically, fail to post any facts or data, I respond.
In the 1970s there was an attempt to start a class iv (1450) in jefferson city, mo. That went nowhere because of objections from stations on 1460 in St. Charles and 1440 in Quincy, IL. Both are much more than 20 miles away. Go get your Office Max calipers and check the distance down to the tenth of a mile because you seem to live in that kind of stark world.
You are neglecting to think about the fact that protection overlap issues occur somewhere between two stations. So a 5 kw station on 1460 will look about 2/3 the distance between St Charles and KIRL's site and the application. Given the distance between the two is about 100 miles, that is nearly 70 miles from St Charles. As I mentioned... the coverage of a class IV is well under 30 miles except in the high conductivity areas of the great plains, and all three cities fall in that area. Most places in the US don't...
And we were discussing a second adjacent, 1340 to 1360 and then a third adjacent, 1510 to 1480. Both cases require less signal overlap protection.
In that same time frame, KLIK in Jefferson City was upgrading to add a night time option for its (then) 950 operation. That station was easily receivable in St. Louis, Kansas City and as far south as Mt. Vernon. The station had to jump through numerous hoops to satisfy concerns by stations operating on the same frequency in Oelwein, IA (then 500 w D) and Chicago, IL. Both were a hell of a lot further away than 20, 30, or even 150 miles.
I specifically said that I was discussing daytime protections. AM skywave rules are based on formulae, not groundwave field strength.
If you still are a disbeliever, try looking at the 1260 family. Start with Syracuse NY and work Westward through Erie and Cleveland. Totally ludicrous assignments that create the very unwarranted interference the FCC was supposed to prevent. They were ludicrous when these stations operated with 5KW and they are even more so now that some have jumped power considerably higher.
Those stations were in full compliance when licensed to 5 kw (Cleveland and Syracuse were 5 kw prior to 1950 and Erie went from 1 kw to 5 kw in the very early 50's. The only one that has increased power is Cleveland, and only to 10 kw, with directionality that essentially keeps the same field towards the other two at the pre-increase late 40's level.
And referencing your earlier posts, so YOU actually think its BAD that the LPFM station in CK can't accept commercial ads?
I did not say that being a noncommercial FM station is bad. I just said that it is different from a commercial AM, and not a valid comparison in this case since commercial viability is a strong issue in the KIKO move.
Apparently a lot of people agree with me because radio listenership is falling, not rising.
The percentage of persons using radio is about the same as it was 20, 30, 40 years ago. The amount of time spent listening to terrestrial radio has decreased, but it would be absurd to thing that it wouldn't with all the new technologies available (starting with cassettes and moving to cable, CDs, DVDs, satellite radio, computers, video games, smart phones and portable devices like the iPod, iPad and such...). It's rather amazing how resilient radio actually has been, at least up till now.
Welcome to the real world. I'm afraid you're in for a bumpy ride.
A bumpy ride is when terrorists set off a bomb a few floors below the station you are launching... today's ride is rather smooth, but on a winding road.