oldiesfan6479 said:
asugeorge1 said:
I also wonder why Phoenix has such weak AM stations. Did we get screwed
back in the day or what?
In a word, yes. Hopefully the Old Gringo (or Keith) will chime in here with
some historical detail.
The easy answer is: When the post-war AM explosion took off, the Valley had a total of around 150,000 people with Phoenix itself being about half of that. Phoenix was probably somewhere in between Market #70 and #100 (closer to the latter, I'll guess), not the #13 it is today. ;D
Most of that population (except for Tempe, Mesa, & Glendale) was within 7 or 8 miles of downtown Phoenix, roughly Glendale Ave. on the north, Baseline Rd. on the south, 40th St. on the east, and 43rd Ave. on the west. Sky Harbor Airport was on the eastern city limits of Phoenix and Scottsdale barely existed. There were outlying pockets of small, unincorporated settlements (Sunnyslope, Cactus, Alhambra, Ingleside) that have since been swallowed by the city, but most of the valley's population was close to downtown in those days.
For that reason, all the AM stations in Phoenix in the late '40s (KOY 550, KTAR 620, KOOL 960, and KPHO 1230, later 910) ran no more than 5 kW. No higher power was needed to cover the lion's share of the market. Mesa (KARV 1400 & KTYL 1490) and Glendale (KRUX 1340) had Class IV stations (250 watts fulltime in those days) of their own that didn't target the entire Valley until later in the '50s, when KTYL & KRUX raised their power to 5 kW and moved to better freqencies (KARV only lasted a couple of years in the late '40s). KRIZ 1230 was one of the highest-rated stations in the '60s, despite only running 250 watts at night. They didn't need more.
I'm guessing that the reason no full-time 50 kW station didn't arrive until the 1980s (on 1580) was because the Class I frequencies were already used up. The FCC didn't allow two 50 kW clear-channel stations on the same Class I (Class A) frequency until much later, and by then, it was too late. Phoenix of the '50s easily could have snagged 670, 700, 720, or 890, but it wasn't allowed back then. There might have been issues with Mexico at the time as well.
Bob Dreste can probably fill in/correct anything I'm saying here since he was working in Phoenix radio in that era. I'm going from some research on Phoenix history and personal experience from the first time I lived here in 1964.