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Re: [Discuss-gnuradio] CPFSK mod/demod + strange behavior


From: Marcus Müller
Subject: Re: [Discuss-gnuradio] CPFSK mod/demod + strange behavior
Date: Thu, 9 Jun 2016 17:37:59 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

Hi Olivier,

trying to catch up with you here. I've got a few questions! Please excuse if they've been answered by you before; it's not really easy to navigate your emails – hint: it gets easier for us to help you if you use the "reply" button in your email client, so that things get clearly sorted into some kind of discussion thread. Also, less emails with condensed questions might be easier to get answers to. You see, I think very few of us currently get the "big picture".
  • Have you verified this works in a simulation-only environment, ie. when you replace the USRP sink/source with a direct GNU Radio stream?
  • Can you post a comparison of Spectrum after the CPFSK modulator (before the RRC) and after the RRC? Just to verify the low-pass characteristics of that pulse shaper don't "eat" the FSK.
  • Could you enlighten us a bit about your design goals, i.e. what's the frequency deviation you want to achieve with the CPFSK?

Best regards,
Marcus


On 09.06.2016 16:50, Olivier Goyette wrote:
There's something wrong at Tx again. Look at the waterfall I joined, we only see one stripe at -312.5 kHz and the signal seems to be going like on/off. Don't know what's going on ??


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