I swear, whenever I cross Mercer Island on I-90 and I'm listening to 770 AM, I hear what sounds like a MOYL formatted station. It fades out after I hit the tunnel going into Seattle. Has anyone else caught this?
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Is There a Pirate on Mercer Island?
- Thread starter CorporateSuit
- Start date
This is a great example of how poor modern AM radios are.
At 770, there should be no response from a signal on 880, even 50kw.
I've seen and had to use such radios in rentals and such, but I'm not going to easily give up
the performance of my old Bendix and Motorola AMs.
Unless there are some other "nearby" signals which could create an "image", this shouldn't be audible.
A return to the 1930s rf performance of mushy autodynes is no progress and not acceptable.
You have experienced the phonomena known as "walking through".
Proper shielding and other design features would have prevented it.
Supposing you were listening to an actual signal on 770, it would be an ugly mess.
This is no reason to not be able to expect to listent to a signal 100 khz offset.
WGN, WBBM and WSCR in Chicago have a little "fun zone" in the nearby region that gives modern car radios fits.
Especially if they happen to be trying to listen to 890 WLS, 35 miles south.
Many radios just swamp out on 670,720,780 signal and 890 becomes inaudible.
At 770, there should be no response from a signal on 880, even 50kw.
I've seen and had to use such radios in rentals and such, but I'm not going to easily give up
the performance of my old Bendix and Motorola AMs.
Unless there are some other "nearby" signals which could create an "image", this shouldn't be audible.
A return to the 1930s rf performance of mushy autodynes is no progress and not acceptable.
You have experienced the phonomena known as "walking through".
Proper shielding and other design features would have prevented it.
Supposing you were listening to an actual signal on 770, it would be an ugly mess.
This is no reason to not be able to expect to listent to a signal 100 khz offset.
WGN, WBBM and WSCR in Chicago have a little "fun zone" in the nearby region that gives modern car radios fits.
Especially if they happen to be trying to listen to 890 WLS, 35 miles south.
Many radios just swamp out on 670,720,780 signal and 890 becomes inaudible.
Ah, so that explains it! That is weird...
I think there's something odd with KIXI's directionalized 50kw that puts out spurious signals on other frequencies, for a long distance. I've noticed it on several different radios, at 10 and at 20 miles away from their transmitter site, in the direction their signal is aimed (NW of Belllevue). It would cover up 900 with a fresh harmonic, not just splatter (when there used to be a Victoria station on that freq). You may also find it in the upper end of the AM band, lower than you might expect for 880 khz x 2.
I also hear KOMO-AM underneath KPTK-AM in certain locations, like when I'm turning a corner. And that's probably 20 miles up the coast of Puget Sound from their Vashon Island sites. Are unsheilded Seattle City Light transmission lines or traffic signal equipment that you can hear for a block from an intersection picking them up and redistributing the signals? And why would KCIS AM630 cause loud heterdyne-type rining on my home reception on AM1090 a few blocks from their daytime transmitter? (The ringing goes away after local sunset, but I don't notice it so much on the car radio in the garage.)
I have NOT noticed the same kind of off freq splatter and multiple "harmonics" in other markets with similarly-strong AM signals in the same vehicle, as monitored by the same radio in my Subaru.
Are several Seattle AMs deliberately doing something to "clobber" other signals? And the FCC are unaware/clueless as to how to detect and prevent it? Or do we have sloppy transmission lines adding to the jumble? Or is there more?
I also hear KOMO-AM underneath KPTK-AM in certain locations, like when I'm turning a corner. And that's probably 20 miles up the coast of Puget Sound from their Vashon Island sites. Are unsheilded Seattle City Light transmission lines or traffic signal equipment that you can hear for a block from an intersection picking them up and redistributing the signals? And why would KCIS AM630 cause loud heterdyne-type rining on my home reception on AM1090 a few blocks from their daytime transmitter? (The ringing goes away after local sunset, but I don't notice it so much on the car radio in the garage.)
I have NOT noticed the same kind of off freq splatter and multiple "harmonics" in other markets with similarly-strong AM signals in the same vehicle, as monitored by the same radio in my Subaru.
Are several Seattle AMs deliberately doing something to "clobber" other signals? And the FCC are unaware/clueless as to how to detect and prevent it? Or do we have sloppy transmission lines adding to the jumble? Or is there more?
I should clarify...
I am listening to 770 but I will hear 880 underneath it. The signal doesn't replace the former. I just hear it for a few minutes in the background while crossing the island.
I am listening to 770 but I will hear 880 underneath it. The signal doesn't replace the former. I just hear it for a few minutes in the background while crossing the island.
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