Bongwater said:
swhyde1980 said:
Have you tried to research why 103.9 got moved to 103.7? I was kinda curious about that.
Pretty simple. You see, back in those days, smaller FM radio stations in the commercial 92-108 band were assigned "local" frequencies (like AM's graveyard channels) called "Class A"s. I believe 103.9 was one of them. The max you could run these stations was 3,000 watts if I remember (they later upped it to 6,000 watts to unlimited now.) 103.9 itself was a better frequency for KTAC/KBRD/KMTT for a long time - especially in the north end of Puget Sound (back when signal reach REALLY mattered and there weren't nearly as many FM stations/translators) because it wasn't smooshed up against CHQM 103.5, but 103.7 was the closest channel where they could go to a higher wattage because of the rules back then.
Yes. Since the 1964 rules went into effect, there were three classes of FM station: A, B, and C. (also D but those were non-commercial ten-watters)
92.1, 92.7, 93.5, 94.3, 95.3, 95.9, 96.7, 97.7, 98.3, 99.3, 100.1, 100.9, 101.7, 102.3, 103.1, 103.9, 104.9, 105.5, 106.3, and 107.1 were reserved for Class A stations - no Class B or C operations on those frequencies. On the other hand, Class A operations could ONLY use these frequencies; you couldn't have a Class A on 106.7, for example.
Class A stations were limited to 3kw/300'; Class C could run up to 100kw/2,000'. (Class B was/is only available in parts of the east and California, where Class C is *not* available0
So a station on 103.9 was limited to 3,000 watts. If they wanted to increase to 100kw, they had to change frequency.
In 1990, Docket 80-90 changed all that, by allowing Class A, B, and C stations on *any* frequency. You can now have a Class C on 103.9, or a Class A on 103.7, etc...
The Class A power limit was increased to 6kw at roughly the same time. That limit survives -- a Class A station is still limited to 6kw -- but now, if you're on 103.9 and want more than 6kw, you can apply to upgrade to Class C. (or C0 or C1 or C2 or C3 as potential interference to other stations permits)