I would add that you usually see the octaves (multiple carriers as squares) when VARA is receiving a large file.
When it first connects and you see the 4 squares, it's measuring the SNR (signal to noise ratio) to determine what speed to use .
Then, depending on how much data it has to move, it sort of shifts gears.
When a packet is missed, it downshifts for awhile then tries to find it's best speed. Adaptive I believe they call it.
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Anyway, lots of things can affect your SNR.? In my case the computer's power supply was noisy.
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73
Mike N0QBH
N0QBH Mike Berg