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From: | Marcus Müller |
Subject: | Re: [Discuss-gnuradio] Regular FM radio fine, POCSAG horrible |
Date: | Mon, 01 Jun 2015 23:25:01 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 |
Hi again, Ok, I'm not familiar with the standard POCSAG, but if you got a signal that you still need to decode with something else, how do you know you don't get clear reception? What is your measure for "good reception"? As far as I read the English wikipedia, POCSAC uses a 4.5kHz binary FSK, so can you see the two alternating frequency e.g. in a waterfall plot of your RX signal? Ideally, you'd directly be able to see the 512, 1200 or 2400 baud. To explain a bit more: GNU Radio is not a decoder for any specific standard; think of it as the LEGO of SDR. You can build amazing things with it, in fact, there's a lot of examples that come with GNU Radio, and useful and complex standard implementations (FM receiver, DTV transmission!), but if you need to have something that's not there, you might need to a) use someone else's Out-Of-Tree module or b) implement that functionality yourself. So I must admit that I don't have the slightest idea which settings you're referring to :) Maybe you're interested in a quick&dirty introduction to GNU Radio [1]. In the case of POCSAG, I remember gr-pocsag being a thing (search for pocsag on cgran.org); I can't remember the original author, and I presume it's pretty much dead -- but I'd love to be proven wrong. Also, pyboms has pocsag-mrt package, but that seems to rely on GNU Radio 3.6.2, if the Readme is correct, so that's pretty dead, too. Best regards, Marcus [1] https://github.com/iZsh/pocsag-mrt On 06/01/2015 10:18 PM, Stephan van
Beerschoten wrote:
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