This is not the first time we have seen similar ditters/dashers on multiple frequencies. Back in April of this year there was several days of similar ditters, but with shorter pulses (about half the length) and shorter pauses between pulses (3 seconds). The relationship of half the pulse width and half the pause is interesting to me and might tie the “then” and “now” signals together.
Video of one frequency here:
http://www.youtube.com/watch?v=jBtMxRIcyFgI think at that time it was on 25+ frequencies at the same time. I am at work right now but will look in the log after I get home and see if any of the freqs are the same as this set.
In the discussion then about that specific signal the possibility of multiple transmit sites was also brought up. There was good argument to support multiple sites, but the phenomena could also be explained by a single site and multipath. The multipath argument was less strong because of the delay between the pulses, the longer of the two paths would have had to be over 1500 km longer (on average, there was some variation if I remember right) than the short path, not impossible at all but also not likely if the source is on the same continent as the listener. The variation in timing on the second pulse was one of the arguments for multipath.
T!
Topic: Dashers / Ditters 5 December (Read 4145 times)