Erroneous Decoding for LDRO Enabled Transmissions

[PKtheanonymousdeveloper]

Hello @tapparelj

I am testing your software decoder for LDRO enabled Transmissions and found out that the output is erroneous and garbled. I have also attached the recorded transmission for your testing to fix LDRO issues.

Transmitted msg in ASCII (hex) at SF 5 with LDRO enabled.
"HELLO WORLD"

Msg Received in HEX in LDRO Enabled SX1268 hardware receiver.
48 45 4c 4c 4f 20 57 4f 52 4c 44 // corresponds to HELLO WORLD, that is the transmitted message.

Erroneous output received using feature/sf5_6_sx126x.
rx Hex: 2a 85 c9 66 07 88 28 d0 2e 9d 6d d2 f3 e3 81 88 58 1c f5 eb 13 6d 86 9f 80 95 3a de e0 bc b3 0e 75 64 4b 2b 70 8e eb 41 8e fe 2f 92 12 f0 8e 1f 7d d7 e8 25 8d db a6 28 85 44 6b c5 66 9c 8c 3e 74 7b ed 9b cf 36 1d d6 07 e4 4d fa dd 7e 56 4c bd ba f2 4b 6d ce 7c 19 1f 34 da 38 62 1c 7e 95 d6.

Recording has been done using RTL SDR with following parameters

Samp Rate. 2 MHz
Centre Freq 450 MHz
Bandwidth 125 KHz

Probably the LDRO would require more fixes in this branch of your code.

Screenshot of the Output

/home/test4/Pictures/Screenshots/Screenshot from 2024-02-20 11-48-03.png

/home/test4/Pictures/Screenshots/Screenshot from 2024-02-20 11-48-23.png

The Recorderd transmission File

3_2024_2_20-10_57_53_4.zip

[tapparelj]

Hello @PKtheanonymousdeveloper,
this problem with LDRO and sf5-6 that has also been reported in this issue #76.
It's in my todo list and I will have a look when I find some time.
Did you, by any chance, tries to use the LDRO with SF>6? If yes, is the output correct or also wrongly decoded?