[HCDX] Mediumwave echo ?

[J999w@xxxxxxx]

Hello all,

I was reviewing a recording I made of Radio Rebelde, Cuba from October 3, 
2002 at approximately 0100z on 900khz and heard something interesting. What 
was initially a normal sounding signal, developed an echo that lasted for 
about 3 minutes, then dissapeared, reverting back to normal again. 

Using CoolEdit software, I measured the delay to be 450milliseconds. I wonder 
what could have caused this delay ? Did it originate in the transmitted audio 
such as a satellite delay, or is it a propagation phenomenon? Reading through 
the literature, I learned that the longpath propagation delay in on the order 
of 130milliseconds.

I have a short audio clip at: http://members.aol.com/j999w/DX

Any ideas?

73!

John Wilke
WB9UAI
Milwaukee
R71a and vertical

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