Luc
The fc offset does not work for me. Wondering since each dongle ppm is
most likely different the fc number will vary. Let run kalibrate on the
dongle and figure my offset.
Rich
pi@raspberrypi:~/work/src/github.com/lheijst/rtldavis $
$GOPATH/bin/rtldavis -maxmissed 4 -tf US -fc 71000
18:18:54.206814 rtldavis.go VERSION=0.10
18:18:54.207304 tr=1 fc=71000 ex=0 maxmissed=4 actChan=[0] maxChan=1
18:18:54.208089 BitRate: 19200
18:18:54.208139 SymbolLength: 14
18:18:54.208177 SampleRate: 268800
18:18:54.208212 Preamble: 1100101110001001
18:18:54.208246 PreambleSymbols: 16
18:18:54.208280 PreambleLength: 224
18:18:54.208313 PacketSymbols: 80
18:18:54.208348 PacketLength: 1120
18:18:54.208382 BlockSize: 512
18:18:54.208416 BufferLength: 2048
Found Rafael Micro R820T tuner
18:18:54.624193 {ChannelIdx:0 ChannelFreq:902348338 FreqError:0}
Exact sample rate is: 268800.001367 Hz
18:18:54.806291 Init channels: wait max 133 seconds for a message of each
transmitter
18:19:17.794307 TRANSMITTER 0 SEEN
18:19:17.794747 Hop: {ChannelIdx:19 ChannelFreq:911881597 FreqError:46}
18:19:20.421401 ID:0 packet missed (1), missed per freq: [0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0]
18:19:20.421613 Hop: {ChannelIdx:41 ChannelFreq:922920108 FreqError:46}
18:19:22.983341 ID:0 packet missed (2), missed per freq: [0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0
0 0 0 0]
18:19:22.983559 Hop: {ChannelIdx:25 ChannelFreq:914892100 FreqError:46}
18:19:25.545226 ID:0 packet missed (3), missed per freq: [0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0
0 0 0 0]
18:19:25.545491 Hop: {ChannelIdx:8 ChannelFreq:906362342 FreqError:46}
18:19:28.109203 ID:0 packet missed (4), missed per freq: [0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0
0 0 0 0]
18:19:28.109582 Hop: {ChannelIdx:47 ChannelFreq:925930611 FreqError:46}
18:19:30.671166 ID:0 packet missed (5), missed per freq: [0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0
1 0 0 0]
18:19:30.671453 Init channels: wait max 133 seconds for a message of each
transmitter
18:19:30.671644 Hop: {ChannelIdx:0 ChannelFreq:902348338 FreqError:46}
On Monday, March 25, 2019 at 12:03:16 PM UTC-4, [email protected] wrote:
>
> Hi Paul,
>
> Good news!
>
> I'm curious if the offset of 71000 Hz also works for Rich.
> If so, we simply add (the minus 71000) to all frequencies in our US list
> and we are done!
>
> Luc
>
> PS.
> The best way is to sort out why we need to use these
> trial-and-error-frequencies and not the common known and used frequencies
> of other projects.
> So far I didn't hear from the original author and I'm still trying to
> understand the ins and outs of the demodulate process.
> I wish I could find a useful article about FHSS and FSK decoding of Davis
> weather equipment signals...
>
