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AM Frequency of the week: 910

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I must have owned some pretty decent radios, because I've never heard the infamous whistle (or whatever it is) on 910. The closest I've come (aside from the also infamous :wobbler" on several channels), was my junior year of high school, when I lived two blocks from K-POI in Honolulu. The transmitter was directly behind the building and adjoining the parking lot. At the time I had a Halicrafters S-118 shortwave radio, and harmonics were all over. Going up to the 80 meter ham band. There must have been at least a half dozen of 'em. Maybe more.

The surprise, to me at least, was that KULA on 690 and K-POI on 1380 co-existed without issue. I have no memory of harmonics from KULA or any other station on the lower end of the shortwave band. Although, depending on what part of town you were in, you could sometimes hear harmonics from other stations. Our 1962 Chevy Impala was definitely prone to picking those up.
 
Here in Wood Dale, IL (near NW suburb of Chicago):

Daytime: both WGTO and WSUI are possible catches at daytime at my location
Nightime: wide open frequency at night

DX/Retro: quite a few DX catches on this frequency including my only AM station log from Maine (WABI, Bangor). Other notable catches include KVIS (Miami, OK), KLCN (Blytheville, AR), KPOF (Denver, CO), KCJB (Minot, ND), WALT (Meridian, MS), WJCW (Johnson City, TN), WHSM (Hayward, WI) WSBA (York, PA), WDOR (Surgeon Bay, WI), WGBI (Scranton, PA), WSTK (Jcksonville, NC) WFVR (Wellborn, FL), CKLY (Lindsey, ON). Also Radio Reloj (Cuba), and YVQR Caracas, Venezuela. My most recent catch on this frequency is WUBR (Baton Rouge, LA) in 2021.
 
WABI is now WTOS, and has gone to 210 watts nondirectional Nights, but remains Class B because it exceeds to new Class B minimum, so it still has to be protected as before, at about a 5 mV/m NIF contour, so no opportunities are opened up for upgrades by other stations. Under older rules, it was under 141 mV/m efficiency, so it would have become an unprotected Class D.
 
From the southwest suburbs of Chicago, 910 is busier than I would have expected considering the WLS transmitter is a few miles away.

Over the years, I've gotten WSBA York, Pa., KGLO Miami, Okla., WLLJ Cassopolis, Mich. (12/27/1991, relogged as WGTO on 11/29/2017), WJCW Johnson City, Tenn. (5/110/2020) and most recently WSIU Des Moines, and not until 1/3/2022. How I missed before then, I know not.

Never noticed the 910 whistle. Guess I've had good radios over the years.
 
From NW San Antonio:

Day: It's semi-local KNAF in Fredericksburg, 52 miles to my N/NW, with a moderately strong signal.

Sunset: KATH in Frisco and KRIO in McAllen start to mix in under KNAF.

Night: KNAF drops to 174 watts and is in/out. Aiming NE, I hear KATH most often, with KRIO coming to the fore occasionally. Aiming E, I hear R. Metropolitana in Cuba fade up every now and then. Later at night, WUBR "Power 910" in Baton Rouge usually mixes in, too.

Sunrise: KBIM (regional Mexican music) in Roswell comes up with a decent signal for a while when it goes to day power.

DX/Retro: I've never heard KVIS from San Antonio, but I did catch it late one night this past October when I was in Wichita Falls, TX.
 
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