Bill Drake said:
No, being short spaced to 1510 might be the reason. Apparently you were out of class on the day the FCC originally had AM spacing requirements as well.
AM's were and are protected based on signal strength determined by actual operation. FMs were, once classes of station were established, protected based on the class of station, irrespective of actual operation.
The FCC does not have AM spacing requirements by class. It has protection requirements based on co-channel, adjacent channel (and so on) contours. Directional operation, conductivity, power, etc. all come into play. And that's without getting into skywave protection (where the only distance related protection does exist but only for a subset of one class of station).
The stations licensed to 1510 and 1480 in different communities of license met the FCC requirements when licensed as well as when the power increases were granted. Keep in mind that when Shel Engel licensed 1510, the possible powers were 250 watts, 500, 1000 and 5000 watts as well as 10, 25 and 50 kw. No incremental or "odd" powers were allowed.
In any event, 1510 and 1480 are at more than adequate separation, and similar separations exist in many markets. KBRT 740 and KSPN 710 in LA are good examples. Or 840 and 870 in two different communities in the Las Vegas metro area. 990 and 1020 in the Miami/Dade metro. And many, many, many more. All meet the overlap requirements and city of license requirements.
As for relevance to this thread, I would call you to look at your many UNRELATED responses in your above posts.
Again, the thread is about KIKO and a proposal to move it from Globe to Apache Junction. That subject is related to the signals on the adjacent and next adjacent channels, as well as the issues of the community of license and the bigger picture of the viability of AM anywhere today.
NAME some of these radios that are available "anywhere" as you state. Or maybe you'd like to borrow my Sangeans that go postal trying to hold half the FM stations in the city.
Well, when I owned 590 and 570 AM which were licensed to the same city, Quito, Ecuador, I never heard of a single complaint that anyone could not tune in either station on any kind of radio made at the time... everything from Philips and Grundig and Telefunken console radios to the run of the mill transistor portables of the time from Japan and the US.
In fact, my 570, which was the #1 station in the market, had enough listeners that I would have known of any interference quickly, either from my own 590 station or the station on 550 to the other side. One of my other stations, at 805 AM, had neighbors at 785 and 835 kHz, and none of us hurt the other. The biggest sequence of 20 KHz stations there was 860, 880, 900, 920, 940, 960 and then a jump to 990. There was also 1070, 1090, 1111, 1140, 1160, 1180, 1210, 1225, 1245 and then 1280. They operated just fine, too. All were licensed to the same city, some had adjacent transmitters, and all were fulltime and nondirectional.
I also have an assortment of receivers including several Sangeans, a Tecsun, several good Sony world band portables, a Drake R8, a TenTec, two ICOMs, and a number of Boston Acoustics as well as a rather extensive collection of early transistor "pocket radios" in working condition. They can all separate locals at 20 kHz, and a number of the portables have been in places where AMs are closer spaced.
"Most" U.S. stations don't cover 20-30 miles? Did you scientifically arrive at that number or is that more of your legendary hyperbole?
No, I simply ran the 5 mV/M contours of a random sample of 200 AMs and looked at the radius of the daytime contour for non-DA stations and the distance to the greatest null for the directionals.
Let's start with the 6 Class C channels... former Class IV's. How many of the roughly 1000 stations on those 6 channels do you think has a 5 mV/m that goes beyond 30 miles? While there may be a few in the 30 conductivity areas of the great plains, most don't approach that distance or come even close. And in most urban areas, 5 mV/m is below the minimum to be listenable at home or at work.
As for the interference problem caused by the myriad of consumer toys, that could have been prevented but at this stage of the game the genie is out of the bottle.
The genie was out of the bottle 50 years ago with the proliferation of fluorescent lights and diathermy machines and such. This is irreversible at this point as the importance of computers and energy saving CFLs (whatever we may think of them) is of far more economic impact than AM radio.
A bigger issue is that even without interference, the most reputable data source in the US only identifies about 160 viable AMs in the top 100 markets... many having none. Sprawling metros have gone way beyond the coverage of stations and classes established in the early 30's and which were outdated just a decade or so after W.W. II.
I knew engaging in a conversation with you would be something akin to jock itch: very irritating. This board needs an "ignore" button!
What this particular discussion needs from you are some actual facts, citations and references. You have made not a single claim that can be substantiated.