Re: [wsjt-devel] WSJT on ARM low power boards, dev is ready

[Joe T. <jo...@pr...>]

Hi Alan,

On 12/7/2014 2:44 AM, Alan VK2ZIW wrote:
> On the Banana Pi, WSPR takes 2 mins 10 secs to "Decode".

This is not a very useful statement.  The decoder used in my WSPR code 
uses the sequential Fano algorithm, and execution times vary widely 
depending on input data.  Signals well above the decoding threshold 
should decode rapidly, and those well below threshold should be skipped 
over quickly.  When a number of near-threshold signals are present, 
decoding them (or finally failing) can take an exponentially long time.

You can control the "timeout" duration by adjusting a parameter called 
"limit" in decode162.f90.  Changing it from 10000 to 1000 will speed up 
failed decodes by ten times, with a modest (less than 1 dB) sensitivity 
penalty.

On another matter: probably you already noticed that I built an ARM 
executable for kvasd 1.12 on your system at
~wsjtdev/kvasd/kvasd_1.12_armv71

	-- Joe, K1JT