I notice this afternoon on that KUIK is noisy. Experimenting with various settings, I believe the added noise is caused by 1330 +/- HD ! Preliminary observations:

If I tune dead center to 1360, there is hiss and some splatter, with receiver set to narrow. If I tune slightly up frequency the hiss reduces and if I tune slightly down frequency, the hiss gets worse.

If receiver is set to wide, the hiss gets worse.

If receiver is set to AM stereo, Khan mode, the hiss is only comes in on the far left speaker. Either with wide or narrow bandwidth.

If receiver is set to AM stereo, Cquam mode, the hiss is centered.

Shouldn't I be able to listen to KUIK without the HD interference?

62~

What kind of receiver (brand, model, year etc.)are you using that has *both* Kahn and Cquam stereo? I would love to try and track one of those down...........

Sony SRF-A100

C-Quam is the only authorized AM Stereo system. Kahn can not be used in that manner!

Yes, but what he is hearing clearly indicates additional noise on the sideband closest to the IBOC station.

Say he used an analyzer instead, would the information be proper then?

Also, noise was reported in ordinary AM mode. This is consistant with approved receiver tech...

As kbbt alludes to in his post, Kahn is an Independent Sideband AM Stereo system. The left channel is on one sideband and the right on the other. Since nobody is using Kahn, then it's a pretty safe bet that the noise heard on channel only when listening to KUIK did not come from the KUIK transmitter.

While composing my last post, I forgot to ask one important question: was the geographical location from which these observations were made closer to KUIK or KKPZ?

Alfredo_T: The observations were taken at an east side of W river listening post location, rough approximation is that KUIK is between 2 and 3 times further away (as the crow flies) than KKPZ is.
This is also within the KUIK red circle on the radio-locator map, and also within the KKPZ red circle.
So for all you nay-sayers out there, I am not like parked on top of Mt Scott.

If you were on the east side of the Willamette River and not north of downtown, you were within KKPZ's 25mv/m contour and outside of KUIK's. I don't know anywhere on the eastside that KUIK is more than a light fringe signal. I believe radio locator's red line indictes a signal strength of 2.5mv/m and don't think it figures in terrain. The west hills can have quite an effect that close in.

I think that you are correct about Radio-Locator's mediumwave propagation model not taking terrain into account. Consider the map for KBPS-AM: it looks like a nice circle. However, if you listen to this station while driving west on 26, the signal strength seems to wane very quickly as you go down in elevation.

Kuik lights up the signal strength LED.
How do you tell where 25mV is and is that some magic threshold?

25mv/m is the interference free, city grade contour. It used to be that a station was required to encompass the downtown or business section of it's community of license with 25mv/m. They changed it to covering the entire COL with 5mv/m, something that was in effect before but they dropped the downtown coverage requirement. Since neither station has changed its power, directional pattern or location since they changed the rule, those numbers should still be in effect. Also, on stations that are 30khz apart, 25mv/m contours do not overlap. If they did, they wouldn't be interference free. In the case of 1520 and 1550, they run right up next to each other but don't spill over!

I listend to KUIK from I-5 in N. PDX and heard no interference from 1330 at all. nothing but a clean signal on 1360.

Interference free means protected from interference. I usually get SOME background noise up there. Maybe you have a very clean radio. Also, I-5 in N Portland is probably beyond 1330's 25mv/m contour.

I can't receive KUIK in downtown Portland. Is that expected?

If you are between all the tall buildings or driving by the streetcar lines, you might not hear KUIK. It does come back as you head away from downtown (I have been able to hear it from Southeast Portland, day and night).

How about if your radio is sitting on top of a computer? Uh, maybe I just answered my question.

I can hear it as "light fringe" in southeast Portland but there are some areas that aren't that good. If it fades out completely in downtown Portland, that sounds like no more than "light fringe" to me. I'll try to make a point of listening to their signal as I'm driving around town.

NoTalent, perhaps you can drive further into SE Portland and try again?