Hi Igor,
Thanks for identifying and reporting this bug in gen9.f90.
-- 73, Joe, K1JT
On 5/19/2017 9:23 AM, Игорь Ч wrote:
> Hello Joe,
> .
> In gen9.f90 207th bit of the i1EncodedBits(207) / i1ScrambledBits(207)
> arrays is not initialized and may take any integer*1 non binary value
> causing corruption of the 69th data tone in JT9 modulation.
> .
> Proposing to fix it in lines 44...48 of gen9.f90 source code:
> .
> nsym2=206
> call encode232(i1Msg8BitBytes,nsym2,i1EncodedBits) !Encode K=32, r=1/2
> call interleave9(i1EncodedBits,1,i1ScrambledBits) !Interleave bits
> call packbits(i1ScrambledBits,69,3,i4DataSymbols) !Pk 3-bits into words
> .
> with this patch:
> .
> nsym2=206
> call encode232(i1Msg8BitBytes,nsym2,i1EncodedBits) !Encode K=32, r=1/2
> i1EncodedBits(207)=0
> call interleave9(i1EncodedBits,1,i1ScrambledBits) !Interleave bits
> i1ScrambledBits(207)=0
> call packbits(i1ScrambledBits,69,3,i4DataSymbols) !Pk 3-bits into words
> .
> 73,
> Igor UA3DJY
>
>
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