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Strange Echo on China Radio International
Last night I was doing some shortwave listening on my new (OLD!) regen. As always, China Radio International was booming in on multiple frequencies. But as I tuned them in, I noted something strange: a very distinct echo on the signal (you can hear it in the video above). Very strange. Kind of like the Long Delayed Echos we've all heard about. I started thinking of explanations. Might this be some weird regen reverb effect? (You see -- I'm still wary of these regens!) But no, I checked -- the echo was there when I listened with my superhet HQ-100. Could it be that this was some strange multipath effect, perhaps involving multiple powerful transmitters in different locations? I was listening to the 0100-0200 UTC (20 Aug 2014) CRI English language service. (The echo continued when they switched to Chinese at 0200) I think the frequency was 9580 kHz. An SWL website says the transmitter was a relay station in Quivican, Cuba.
What do you guys think? These fellows might have an explanation:
http://swling.com/blog/2014/07/china-radio-international-warbling-on-daves-home-brew-receiver/
I really like shortwave listening with this old homebrew 1930s radio. There are still a lot of interesting signals out there. Recently heard: Voice of Vietnam, Radio Turkey, Radio Romania, WWV, WWVH, CHU, W1AW, transatlantic aircraft, Radio Australia, Radio New Zealand... and the mysterious numbers.
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