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I had the same experience with the Algerian on 1251 in the 70's... on my stock GM car radio I would get a het against 1250 from about 4 PM with considerable frequency when driving near the coast in areas of San Juan, Carolina and Cataño. On occasion, it was readable in Arabic. It could even occasionally be heard as far inland as Guaynabo and even Caguas.
A few times a year, we got Saharan dust storms, and it was almost certain on those days that the Algerian would be listenable.
I once read in a posting about an 891 QRMing WLS, but I do not remember the details.
A friend who spent some time in Alaska reported that he had never heard any Asian stations, neither Mongolian nor Siberian.
Back in the 1960s and 70s, another friend in Miami reported ocassionally hearing Dakar, Senegal under WABC on whatever the equivalent of 765 KHz was at the time.
Does anyone remember what year the long and medium wave broadcast band channels outside the Americas moved to multiples of 9 KHz?
A friend who spent some time in Alaska reported that he had never heard any Asian stations, neither Mongolian nor Siberian.
Back in the 1960s and 70s, another friend in Miami reported ocassionally hearing Dakar, Senegal under WABC on whatever the equivalent of 765 KHz was at the time.
Does anyone remember what year the long and medium wave broadcast band channels outside the Americas moved to multiples of 9 KHz?
I do remember 1 kHz, 2 kHz, ... heterodynes. One may have been near 890, since WLS is not usually a really strong skywave where I drive in Michigan due to the 189.3 degree tower. The slightly reduced skywave does allow an offset carrier from 10 kHz to be perceived as somewhat more intense audio modulation than a strong local groundwave or a stronger skywave like WCFL...WMVP would. Sadly, Ed Cantelon of Broadcast Measurements has passed away. I would have liked to talk to him about what he observed on these types of heterodynes. He had Beverage Antennas oriented in many directions to do carrier frequency measurements.
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Europe has been on 9 kHz for a good long time.
In the post-WW II years, the plan was developed, and by 1949 it was coming together:
http://www.americanradiohistory.com/Archive-Guide-to-Broadcasting/Guide-to-Broadcasting-5.pdf
The "irregularities" apparently had more to do with trying to get agreement between several dozen independent nations than with the sound theory of the plan.
By the early 50's, it was completely "together".
http://www.americanradiohistory.com/Archive-Guide-to-Broadcasting/Guide-to-Broadcasting-7.pdf
At some poin around 1978, there was a European reassignment sort of like our NARBA agreement in '41. The 9 kHz intervals were varied, and we had things like Radio Luxembourg moving from 1439 to 1440 and Radio Monte Carlo from 1466 to 1467.
In the period from the 50's to the 70's, the biggest issue in the US was not caused by European stations but ones in this hemisphere. Many nations in the Caribbean and Latin America licensed stations with split frequencies such as 555 or 995. And then many of them, even some high power ones, would drift and run up to several kHz high or low.
I would imagine that those uninvited guests would make measurements of domestic stations a challenge.
On the car radio tonight around 9, there were hets on 530, 550, and 910. Not enough to identify them, though 530 was most likely the Algerian station.
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