Bill Meara, producer of the popular SolderSmoke Podcast, recently recorded audio echoes on a couple of his home brew regenerative receivers. Bill posted the following video, of his regen receiver tuned to China Radio International:
After Bill measured the echo delay at .133 seconds, he believes one possibility is that they originate from a propagation opening much like Lyle recorded on a 10 meter band opening last year (click here to listen to the audio and read the post).
A few days later, Bill recorded a similar echo effect while tuned to Brother Stair (Overcomer Ministries) on a different regenerative receiver. Click here to read the post and view the video.
The fact that Bill measured a .133 second delay (the amount of time it would take for a signal to circle the globe), makes me believe he’s hearing an echo similar to Lyle. But I must admit, I’m a bit amazed that a faint AM echo could penetrate blowtorch signals like CRI and Brother Stair’s relay generate State side.
Readers: What’s going on here? Is Bill catching rare propagation openings–or perhaps ducting in the Earth’s magnetosphere and ionosphere–or is there another explanation?