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From: | Marcus Müller |
Subject: | Re: [Discuss-gnuradio] DBPSK and USRPs |
Date: | Mon, 26 Oct 2015 20:46:24 +0100 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 |
Hi! * looking at your constellation, relief comes setting in: It looks pretty circular to me; notice how the axes are scaled differently. So no catastrophic IQ imbalance. * the fact that it's circular and not a line is probably the result of the constellation sink not being able to achieve timing synchronization, i.e. it doesn't "know" when a symbol starts * You're right, RX SNR is terrible. However, RX power is very little indeed * Rule of thumb: if(not clipping && in doubt) increase gain; * What exactly is your "RF channel": antennas, direct cable with attenuator? * The mistake I do every few months: Did you connect the antenna/cable to the wrong SMA port? Best regards, Marcus On 26.10.2015 20:33, Washbourne, Logan
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