The discussion on part 15 reminded me of a DX experience. American Airlines at DFW had two stations, one approach and one departure information, in the expanded band. Their two stations and the Elizabeth, NJ AM at 1660 at the time, fifteen years ago, were the only ones on EB. Before that part of the band filled up I could hear both AA stations in Owensboro, KY. Anyone else remember receiving those two stations?
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American Airlines Dallas TIS
- Thread starter radiorob2.0
- Start date
C
cd637299
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U betcha. One was on 1640 & one on 1680. I heard them from south Florida, ostensibly on my Superadio III----I don't recall another radio that would do it.
A DXer in Hawaii who passed away about 3 years ago caught them as well, so I had no right to brag!
cd
A DXer in Hawaii who passed away about 3 years ago caught them as well, so I had no right to brag!
cd
I heard both Dallas stations near San Diego, CA.
I wonder how many stations would have to go off the air if the clears were protected to their 36dB below atmospheric noise nighttime 0.001% contour? (By that I mean the specified contours of the two stations could not overlap.) I picked 36dB BELOW atmospheric noise, as I can hear a 3kHz sine wave to about 24dB or so below a particular level of white noise, and wanted some extra room in case someone else's ears are better than mine. As for the 0.001% contour... that was a total guess - another way to put it would be the "once in a lifetime freak conditions" that enable you to briefly (for a few seconds) receive a particular station that there would otherwise be NO chance to receive (after and before which you will NEVER be able to hear that station in your lifetime from that location even if everything else is off the air).
So... about what time period would the graveyard channels have sounded like the expanded band did when those TIS's were the only transmitters on the air? I'd guess probably not much later than 1920, right?
Also... back then, I wonder how far they would have been heard in the daytime with a good enough radio and antenna? Is it possible to "extend the range" about 130 times with a good enough setup? As for how I arrived at that figure...
I recently experimented with a Tecsun PL-380, Select-A-Tenna, and power pole with its ground wire, and KCBQ overloaded the radio from about 9 miles away. Earlier today, I was on the road near their transmitter site, listening to KCBQ barefoot. Without going into detail of my calculations, I basically had to be about 100 times closer to get a similar level of barefoot overloading that I had with the powerline "antenna" and select-a-tenna. As for where the extra 1.3x comes from.... I'm about that far outside KIXW's predicted fringe signal on radio-locator, but my barefoot PL-380 can receive it with a weak but copyable signal.
Now.... I'm thinking it would be a bit much to expect an antenna combination to extend the range of a station by 100 times, though. If it could, then assuming I had a directive and selective enough setup, I could possibly theoretically hear WBZ in the daytime from San Diego, CA, which I'm sure is impossible. (I calculated/estimated with a few stations on 1170, and not taking into account differences in ground conductivity, KJNP would be heard almost 12,000 miles away. However, I think atmospheric noise is probably high enough so that even if man-made noise and all other signals were taken out of the equation, it still is Not Gonna Happen.
If only.... *dreams*
I wonder how many stations would have to go off the air if the clears were protected to their 36dB below atmospheric noise nighttime 0.001% contour? (By that I mean the specified contours of the two stations could not overlap.) I picked 36dB BELOW atmospheric noise, as I can hear a 3kHz sine wave to about 24dB or so below a particular level of white noise, and wanted some extra room in case someone else's ears are better than mine. As for the 0.001% contour... that was a total guess - another way to put it would be the "once in a lifetime freak conditions" that enable you to briefly (for a few seconds) receive a particular station that there would otherwise be NO chance to receive (after and before which you will NEVER be able to hear that station in your lifetime from that location even if everything else is off the air).
So... about what time period would the graveyard channels have sounded like the expanded band did when those TIS's were the only transmitters on the air? I'd guess probably not much later than 1920, right?
Also... back then, I wonder how far they would have been heard in the daytime with a good enough radio and antenna? Is it possible to "extend the range" about 130 times with a good enough setup? As for how I arrived at that figure...
I recently experimented with a Tecsun PL-380, Select-A-Tenna, and power pole with its ground wire, and KCBQ overloaded the radio from about 9 miles away. Earlier today, I was on the road near their transmitter site, listening to KCBQ barefoot. Without going into detail of my calculations, I basically had to be about 100 times closer to get a similar level of barefoot overloading that I had with the powerline "antenna" and select-a-tenna. As for where the extra 1.3x comes from.... I'm about that far outside KIXW's predicted fringe signal on radio-locator, but my barefoot PL-380 can receive it with a weak but copyable signal.
Now.... I'm thinking it would be a bit much to expect an antenna combination to extend the range of a station by 100 times, though. If it could, then assuming I had a directive and selective enough setup, I could possibly theoretically hear WBZ in the daytime from San Diego, CA, which I'm sure is impossible. (I calculated/estimated with a few stations on 1170, and not taking into account differences in ground conductivity, KJNP would be heard almost 12,000 miles away. However, I think atmospheric noise is probably high enough so that even if man-made noise and all other signals were taken out of the equation, it still is Not Gonna Happen.
If only.... *dreams*
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