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really strange RX

I cannot identify what it was that I just heard:
at 20:55, i was bringing my dial up to try and hear IO-26, but I was startled when I came accross another signal several hundred KHz below my destination!  I stopped to see if it was juse local noise, and found that it was indeed LEO in origin.  I picked it up at about 435.801MHz while rotating the beam from the north to my east.  As far as I can tell, there is no satellite using a frequency in that range, on the list found on the AMSAT website under "Satellite Frequencies".  The signal seemed to be strongest in the direction of IO26/KO25.  judging by the rate of doppler-shift it must probably be either one of those satellites.  It also faded out just before IO26/KO25 were near my horizon, given the inaccuracy of my PC clock, they might have been exactly at the horizon.  It's been a week since I synchronised my clock, it was 4 seconds behind.  

The signal sounded exactly like AO-16 MBL mode before they put it in voice mode.  I think I even heard a packet or some form of data transmitted once during this pass.

Is it just a typo where IO26 is actually lower in frequency by about 60KHz?  Might it somehow have drifted that far down?  Or is it another satellite altogether?

Auke de Jong
Edmonton, AB

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