Re: [Discuss-gnuradio] decoding a AM Signal into a sequence of bits

[Marcus Müller]

Hi Rebecca,

for OOK, this sounds like the right thing to do; but: have you tried removing the complex to mag block? MM should profit from having the phase of the signal; see formula [1]. To get a real-valued signal, since AM is spectrum-symmetrical, you'd not be loosing much when you just use the real part of your complex stream (even better: use the complex clock_recovery_mm_cc).

I do think a reliable stream of alternating 0 and 1 sounds promising. Can you try out different address settings, and compare the bitstreams? I'm absolutely not familiar with the FS20 protocol, so: when you simply look at e.g. a waterfall plat of a signal, do you "see" these 0s and 1s?

Cheers,
Marcus

[1] https://lists.gnu.org/archive/html/discuss-gnuradio/2015-07/msg00610.html
[2] http://www2.produktinfo.conrad.com/datenblaetter/600000-624999/620338-an-01-de-KLINGELTASTER_FS20_TK.pdf

On 26.11.2015 14:03, Rebecca wrote:

Hi i want to decode a bell push signal from typ FS20 TK by Using HackRF one .The frequenz is 868.35 MHz the modulation is AM. I use 19.2k Baudrate.The Bell push use a ook protocol. I use the Sample rate from 2 MHz. to my flow graph i use a low pass Filter a complex to mag block as demodulator, a M&M clock recovery and binary slicer and at the end a File sink.When i generate the graph i became into the file sink a sequence of bit 010101010101010101010..... from start to the end. I would like to see the entire packet (including the preamble and sync word). A signal can not just have a sequence of bit like 0101010101010101... from the start to the end. I also use a other equipment with the same Frequenz but i still become the same sequenz of bit. i don't know my mistake . Please can anyone help me? Thanks Rebecca

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