Replies: 4 comments 4 replies
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Example unfiltered:
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Don't capture near DC, you are still too close to center add 10-30 kHz. |
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Awesome! Thank you. I will try this and I very much appreciate your response. I read about the DC offset but wasn't sure if I had gone far enough off center or was just overloading the receiver (-2.2 seems kinda hot.) I did have a question about the Manchester encoding. Is there any easy way to get this FSK_PCM data decoded with rtl_433? The only option applicable option I see for decode is decode_dm and the output on the previously captured/adjusted files doesn't match what I'm getting in UHR. |
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There is |
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I have an Aclara 8150DD6 MTU that I decoded awhile back. FSK If your meter id is 7587511 and the reading is 040685 they use a similar protocol. I did this a few years ago but would love to get the decoding into rtl_433. |
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@tjmc, I have a ACLARA 3451-103-XBW RF 3400 Water MTU supplied from City of Austin Water (TX). I have just connected an SDR to my computer and was using rtl_tcp & rtlamr to see my gas meter. I suspect I'll need to run rtl_433 to see this water meter in a different frequency perhaps; but it sounds like it'll be encoded. I was wondering if you could help me out with guidance of how to read the codes so that I can try running them through your hexagram code. My MTU ID# is 71004175 according to the label. |
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There are some good docs about the process https://github.com/merbanan/rtl_433/blob/master/docs/ANALYZE.md. My ACLARA has a frequency sticker on it. If yours doesn't, rtl_power probably is your next step to figure it out. If your device is like mine, it is battery powered. Mine only transmits every 12 hours and ~15min so expect not seeing a signal right away. |
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The "MTU ID" printed on my unit is 8 digit starting with 4113. But I've
never been able to see that in captures. I did install a flume device to
read water use off the meter with the intention to directly compare the
known use with the data transmitted but never circled back around to it.
When I get some time I can work on it, I do see a value to the community in
decoding this.
…On Thu, Feb 1, 2024, 8:42 AM TJ ***@***.***> wrote:
I have an Aclara 8150DD6 MTU that I decoded awhile back.
FSK
Differential Manchester
Transmits every 12 hours and ~15 minutes
If your meter id is 7587511 and the reading is 040685 they use a similar
protocol. I did this a few years ago but would love to get the decoding
into rtl_433.
https://github.com/tjmc/hexagram
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Known:
Suspected/Implied (based on documents):
Suspected/Discovered:
Example file after filtering:
g047_452.862M_250k.cu8.zip
As shown I can get a comprehensible signal from UHR but need help with rtl_433.
I can only seem to reliably capture the signals with the following (It does also seem to work without the offset):
rtl_433 -f 452862490 -s 250k -p 10 -Y "minlevel=-3,minmax,squelch" -S all
pi@pisdr:/media/pi/guest/452.862M $ /home/pi/Desktop/rtl_433/src/rtl_433 -A ./g047_452.862M_250k.cu8 -Y "minmax"
rtl_433 version nightly-17-g3264d01d branch master at 202303230949 inputs file rtl_tcp RTL-SDR SoapySDR with TLS
Use -h for usage help and see https://triq.org/ for documentation.
Trying conf file at "rtl_433.conf"...
Trying conf file at "/home/pi/.config/rtl_433/rtl_433.conf"...
Trying conf file at "/usr/local/etc/rtl_433/rtl_433.conf"...
Trying conf file at "/etc/rtl_433/rtl_433.conf"...
[Protocols] Registered 210 out of 243 device decoding protocols [ 1-4 8 10-12 15-17 19-23 25-26 29-36 38-60 63 67-71 73-100 102-105 108-116 119-121 124-128 130-149 151-161 163-168 170-175 177-197 199 201-215 217-228 230-232 234-241 243 ]
[Input] Test mode active. Reading samples from file: ./g047_452.862M_250k.cu8
Detected FSK package @0.101412s
Analyzing pulses...
Total count: 313, width: 94.96 ms (23741 S)
Pulse width distribution:
[ 0] count: 1, width: 0 us [0;0] ( 0 S)
[ 1] count: 45, width: 8 us [8;8] ( 2 S)
[ 2] count: 3, width: 72 us [68;76] ( 18 S)
[ 3] count: 26, width: 20 us [20;24] ( 5 S)
[ 4] count: 19, width: 12 us [12;12] ( 3 S)
[ 5] count: 25, width: 16 us [16;16] ( 4 S)
[ 6] count: 25, width: 36 us [32;48] ( 9 S)
[ 7] count: 14, width: 28 us [28;32] ( 7 S)
[ 8] count: 4, width: 112 us [100;124] ( 28 S)
[ 9] count: 63, width: 4 us [4;4] ( 1 S)
[10] count: 2, width: 52 us [52;56] ( 13 S)
[11] count: 48, width: 380 us [316;464] ( 95 S)
[12] count: 23, width: 732 us [660;808] ( 183 S)
[13] count: 2, width: 284 us [284;288] ( 71 S)
[14] count: 5, width: 512 us [484;560] ( 128 S)
[15] count: 4, width: 208 us [200;224] ( 52 S)
Gap width distribution:
[ 0] count: 41, width: 8 us [8;8] ( 2 S)
[ 1] count: 25, width: 12 us [12;12] ( 3 S)
[ 2] count: 33, width: 20 us [20;24] ( 5 S)
[ 3] count: 58, width: 4 us [4;4] ( 1 S)
[ 4] count: 23, width: 16 us [16;16] ( 4 S)
[ 5] count: 22, width: 36 us [36;48] ( 9 S)
[ 6] count: 6, width: 56 us [52;68] ( 14 S)
[ 7] count: 16, width: 28 us [28;32] ( 7 S)
[ 8] count: 2, width: 92 us [92;96] ( 23 S)
[ 9] count: 4, width: 140 us [128;168] ( 35 S)
[10] count: 17, width: 600 us [492;756] ( 150 S)
[11] count: 38, width: 440 us [380;496] ( 110 S)
[12] count: 1, width: 348 us [348;348] ( 87 S)
[13] count: 22, width: 840 us [756;900] ( 210 S)
[14] count: 4, width: 212 us [200;244] ( 53 S)
Pulse period distribution:
[ 0] count: 8, width: 8 us [8;8] ( 2 S)
[ 1] count: 40, width: 20 us [20;24] ( 5 S)
[ 2] count: 8, width: 120 us [100;144] ( 30 S)
[ 3] count: 34, width: 40 us [36;52] ( 10 S)
[ 4] count: 13, width: 16 us [16;16] ( 4 S)
[ 5] count: 27, width: 28 us [28;32] ( 7 S)
[ 6] count: 26, width: 60 us [52;76] ( 15 S)
[ 7] count: 7, width: 84 us [76;92] ( 21 S)
[ 8] count: 20, width: 12 us [12;12] ( 3 S)
[ 9] count: 5, width: 160 us [152;172] ( 40 S)
[10] count: 48, width: 820 us [656;1064] ( 205 S)
[11] count: 37, width: 408 us [324;496] ( 102 S)
[12] count: 13, width: 524 us [472;592] ( 131 S)
[13] count: 7, width: 1564 us [1348;1668] ( 391 S)
Pulse timing distribution:
[ 0] count: 1, width: 0 us [0;0] ( 0 S)
[ 1] count: 86, width: 8 us [8;8] ( 2 S)
[ 2] count: 9, width: 60 us [52;76] ( 15 S)
[ 3] count: 59, width: 20 us [20;24] ( 5 S)
[ 4] count: 44, width: 12 us [12;12] ( 3 S)
[ 5] count: 48, width: 16 us [16;16] ( 4 S)
[ 6] count: 52, width: 36 us [32;48] ( 9 S)
[ 7] count: 22, width: 28 us [28;32] ( 7 S)
[ 8] count: 8, width: 108 us [92;128] ( 27 S)
[ 9] count: 122, width: 4 us [4;4] ( 1 S)
[10] count: 5, width: 48 us [48;56] ( 12 S)
[11] count: 86, width: 408 us [316;492] ( 102 S)
[12] count: 51, width: 776 us [640;900] ( 194 S)
[13] count: 3, width: 272 us [244;288] ( 68 S)
[14] count: 17, width: 528 us [480;588] ( 132 S)
[15] count: 8, width: 200 us [168;224] ( 50 S)
Level estimates [high, low]: 9846, 155
RSSI: -2.2 dB SNR: 18.0 dB Noise: -20.2 dB
Frequency offsets [F1, F2]: 1478, 2742 (+5.6 kHz, +10.5 kHz)
Guessing modulation: Non Return to Zero coding (Pulse Code)
Attempting demodulation... short_width: 4, long_width: 4, reset_limit: 4096, sync_width: 0
Use a flex decoder with -X 'n=name,m=FSK_PCM,s=4,l=4,r=4096'
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