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KPRO 1570
- Thread starter 30james
- Start date
it would cost way too much to build to a brand new station which would require multiple towers
Who would want it? If the license was turned in, then someone else would have to file for a brand new station. And the FCC is not taking apps for new daytimers.
Radio: Riverside’s KPRO goes off the air after 61 years, station land sold to build homes
The station’s longevity includes the staff: Station general manager Valorie Stitely has been with KPRO since she was a teenager, more than 40 years.
www.pe.com
The towers are coming down if they haven't already and the land was sold for houses.
How did 1570 not interfere with 1580 in L.A?
First, 1570 and 1580 are dreadful, terrible high-band frequencies. Second,. the ground conductivity in Southern California declines as one goes inland from LA. 1580 is highly directional to the West; it has nearly no signal towards the East or Southeast; it protects the Mexican border among other things. At night, it is even worse as it protects the 1580 clear channel in Hermosillo, Sonora (which migrated but is still a Mexican clear channel).
Keep in mind that 1 kw on 550 covers (if all other things like antenna and location are the same) as well as 50 kw at 1500 on the AM dial.
1570 was directional away from LA. They did not have conflicting signals anywhere.
I lived in Los Angeles, about 10 miles south/west of downtown, and KDAY had a strong, city-grade signal. In 1979, we moved to La Verne, about 35 miles east of LA. KDAY during the day was faint, and at night, was almost always covered by XEDM Hermosillo. In the morning, KNIX in Phoenix overrode KDAY.
Meanwhile there was an article in the 1979 World Radio TV Handbook about DX-ers in Australia and New Zealand receiving KDAY regularly, as its pattern dumped most of its 50kw signal over the Pacific Ocean...
Yep, that is just as expected. The transmitter site is a couple of miles east of MacArthur Park and the day signal goes mostly in a 180° arc to the west. At night, it is a flashlight beam going roughly west/southwest. At night, even Glendale, Burbank and such are poor or just not there.
That reminds me. I have a QSL letter from KOY-550 in Phoenix (now KFYI) from the late 70s, They ran 5kw day and 1 kw night. Their slogan, on the bottom of the letter, was "Covering Arizona Like The Sun."
It should be pointed out that back the day (prior to 1968 when 1580 was only a daytimer), the KDAY transmitter was in Santa Monica, just southwest of the junction of the 10 Fwy, and the 405 Fwy. Although their nulls went to the west to meet 1590 Ventura's .5mv near Pt Mugu and to the east to protect KWOW 1600 in Pomona. KDAY's ERP to the S/SW was nearly equal to or greater than 200kw. and could be heard on any radio in San Diego (I was there!) , and in Oceanside sounded nearly local! If you look at map it can be seen that it was virtually a total saltwater path (like KNX in Torrance) down the coast. However, the signal today from the transmitter on Alvarado St. in Echo park, coupled with poor ground conductivity in and around the downtown Los Angeles area is still land based all the way through about 2/3 of Orange County before the signal escapes to the ocean. Today's signal in SD County is very weak. KDAY moved their transmitter to the present location around 1968, because nighttime operation from Santa Monica would have been impractical, the station would essentially serve only Santa Monica and the little "beach" cities down to Torrance, and XEDM from Hermosillo would have been easily heard under KDAY in most of the LA Basin. By the way when KDAY was a daytimer, at sign-on and sign-off, they actually promoted themselves as "Serving Los Angeles and San Diego".
Wow, I never knew that about 1580's San Diego signal in the late 1960s. Another interesting point: up until about two years ago KBLA in San Diego at night was covered up by the 50kw signal of Radio Disney out of Phoenix. That disappeared of course when the Phoenix station downgraded their night power.
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