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Date: Sun, 12 Feb 2012 15:27:07 +0000
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Subject: LF: Casting Bits
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I remember Graham saying you can lose 1/3 of OPERA Data and still get 
copy but he was not sure which 1/3.

I have tried dropping 1/3 of the data bit spread throughout the message 
in a random fashion, this looks very cruel and it is, I have had just on 
copy and local at that.

Only 2 stations to punish with tests this afternoon this are normal 
results :-

14:21    500 G3ZJO de G8HUH Op4 181 km -26 dB in Somerset.
14:21    500 G3ZJO de M0BMU Op4  -15 dB in nr Hatfield
14:21    500 G3ZJO de G3ZJO Op4 0 km +6 dB in Northampton

1/3 random bits dropped throughout entire message:-

  13:35    500 8N3CSZ de G3ZJO Op4  -30 dB in Northampton

Two more tests can give surprising results. 1/3 of all data dropped in 
the middle of the transmission :-

14:47    500 G3ZJO de M0BMU Op4 76 km -17 dB in nr Hatfield
14:47    500 G3ZJO de G3ZJO Op4 0 km +3 dB in Northampton

1/3 of all data dropped in random blocks :-

14:53    500 G3ZJO de G8HUH Op4 181 km -28 dB in Somerset. test4
14:53    500 G3ZJO de M0BMU Op4 76 km -17 dB in nr Hatfield
14:52    500 G3ZJO de G3ZJO Op4  +0 dB in Northampton

Naturally propagation comes into play here G8HUH does not copy every time.

73 Eddie G3ZJO