Some of the extra info could be normal/inverted.
Someone decided it would sound good to double the codes with 'inverted' codes, but in reality it's all marketing, as every inverted code corresponds to a normal code. (for example, inverted 023 is normal 047)
But you can still program inverted codes in most RSS.
Joe M.
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On 9/1/2022 3:11 AM, Dennis Boone wrote:
I spent most of today's X9000 hacking staring at DPL. I think I've
found part of the pattern. 'Scusing the crappy formatting, here are
several DPL codes, their bit patterns, the two byte hex value generated
by RSS, and the bit pattern for that.
dpl 000000023 dpls 000010011 rss f864 rsss 1111100001100100
dpl 000000025 dpls 000010101 rss fc54 rsss 1111110001010100
dpl 000000026 dpls 000010110 rss f434 rsss 1111010000110100
dpl 000000031 dpls 000011001 rss fc4c rsss 1111110001001100
dpl 000000116 dpls 001001110 rss f039 rsss 1111000000111001
dpl 000000125 dpls 001010101 rss f855 rsss 1111100001010101
dpl 000000131 dpls 001011001 rss f84d rsss 1111100001001101
dpl 000000244 dpls 010100100 rss e912 rsss 1110100100010010
dpl 000000245 dpls 010100101 rss fd52 rsss 1111110101010010
dpl 000000251 dpls 010101001 rss fd4a rsss 1111110101001010
dpl 000000411 dpls 100001001 rss ecc8 rsss 1110110011001000
dpl 000000412 dpls 100001010 rss e4a8 rsss 1110010010101000
dpl 000000413 dpls 100001011 rss f0e8 rsss 1111000011101000
dpl 000000734 dpls 111011100 rss e99d rsss 1110100110011101
dpl 000000743 dpls 111100011 rss f5e3 rsss 1111010111100011
dpl 000000754 dpls 111101100 rss fd9b rsss 1111110110011011
The full bit pattern sent by the transmitter, read left to right,
consists of 11 Golay parity bits (p10-p0), then the '100' (4) that's
part of every DPL code (c2-c0), then the nine bits that represent the
part of the DPL code that is typically listed in the table (d8-d0). But
all of this is sent LSB (d0) first, i.e. for the code '023', the first
bits sent are '110010000' -- the reverse of the dpls column entry shown
above for 023. Mike has some nice diagrams of the bit layout on the DPL
page at onfreq. This is the full word for 023:
11101100011-100-000/010/011
Number the bits of rsss from b0 at the low order end to b15 at the high
end. If you compare d0-d6 (i.e. reversed) of dpls for each code above
to b6-b0 (i.e. not reversed) of rsss, you'll see they match. Then d7-d8
of dpls to b8-b7 of rsss again match.
That leaves b15-b9 of rsss to explain. Skip thinks there are a couple
of flags in there. In the X, the top three Golay parity bits are part
of the code plug, so something like that could be going on here.
De
