KQRR Mt. Angel (between Salem & Portland) runs 25 kW daytime on 1130, directional north through west.
They hammer CKWX after sunrise and before sunset for short periods. In winter they cause interference quite a bit of the day.
That interference on 1130 from KQRR makes CKWX unlistenable for large portions of the day for at least six months of the year. And not just in the hour before local sunset, especially in the rainy and overcast months. This happens in the Seattle area, and all the way until you're pratically on top of their transmitter site, a bit north of the border near Hwy 99.
Since KQRR is directionalized from south of Portland to the north, it essentially wipes out the only all-news station in the region. A type of radio "warfare" not unlike old Soviet era signal jamming is the result.
I have even heard significant interference to CKWX INSIDE the Canadian border at Abbotsford a couple of hours pre-sunset, when KQRR drops power and the problem suddenly goes away. It hasn't changed at all since it started.
I don't know why the licensee of CKWX didn't petition for an international requirement for KQRR to reduce power during "critical hours." This is an example of why such a reduction before the regular nighttime power drop is needed for some high power directional AM set ups.
I for one really do want to listen to them, and benefit from their coverage. Even tho' I live in the Seattle area. And especially find it helpful to listen to when I'm on I-5, heading toward Canada. But Russian language hymns popping in over a City News 1130 traffic and weather update on the 1s really doesn't serve anyone's interest. It's just another example of the kind of signal issues that have driven people away from radio, particularly the AM band, which has few other general interest stations with live announcers and a news format.
I tried bringing it up years ago to the FCC field office in Redmond when KQRR first started causing interference, to ask what could be done to remedy the problem. The person who answered the phone didn't care and offered no way for me to make an official complaint.
Do any of your remember those couple of months after the licensee of KQRR reported they were shutting down the station, due to lack of revenue? I wonder how that changed and they powered up again after a few months., with the same Russian language Pentecostal religious programming. Seems to be an odd choice for funding a 50kw multi-tower transmitter, and knocking an all-news signal down to an unusable crush of noise for many potential listeners. Who really benefits from that?