{"action":"created","issue":{"url":"https://api.github.com/repos/pavel-demin/red-pitaya-notes/issues/695","repository_url":"https://api.github.com/repos/pavel-demin/red-pitaya-notes","labels_url":"https://api.github.com/repos/pavel-demin/red-pitaya-notes/issues/695/labels{/name}","comments_url":"https://api.github.com/repos/pavel-demin/red-pitaya-notes/issues/695/comments","events_url":"https://api.github.com/repos/pavel-demin/red-pitaya-notes/issues/695/events","html_url":"https://github.com/pavel-demin/red-pitaya-notes/issues/695","id":314283357,"number":695,"title":"qspectrumanalyzer & soapy_power not working with the SDR transceiver - Ubuntu 16.04","user":{"login":"satfan52","id":14941529,"avatar_url":"https://avatars0.githubusercontent.com/u/14941529?v=4","gravatar_id":"","url":"https://api.github.com/users/satfan52","html_url":"https://github.com/satfan52","followers_url":"https://api.github.com/users/satfan52/followers","following_url":"https://api.github.com/users/satfan52/following{/other_user}","gists_url":"https://api.github.com/users/satfan52/gists{/gist_id}","starred_url":"https://api.github.com/users/satfan52/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/satfan52/subscriptions","organizations_url":"https://api.github.com/users/satfan52/orgs","repos_url":"https://api.github.com/users/satfan52/repos","events_url":"https://api.github.com/users/satfan52/events{/privacy}","received_events_url":"https://api.github.com/users/satfan52/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2018-04-14T00:24:48Z","updated_at":"2018-04-14T11:51:49Z","closed_at":null,"author_association":"NONE","body":"Hello,\r\n\r\nI am trying to use the red-pitaya as a spectrum analyser using qspectrumanalyzer & soapy_power as a client to the SDR transceiver but it gives erroneous results in my Ubuntu 16.04 environment. The qspectrumanalyzer application launches ok and the soapy_power sweep starts fine  but the spectrum displayed is very \"creative\" (to say the least, see picture enclosed).\r\n\r\nthe parameters I use are: driver=redpitaya, addr=192.168.0.102, port=1001\r\n\r\nThe problem could be with the SDR transceiver,  qspectrumanalyzer & soapy_power or in my own environment. However since my rtl-sdr dongle works \"normally\" with qspectrumanalyzer & soapy_power I suspect that the problem is not in my environment. \r\n\r\nIn the pictures below, the test signal is at 28Mhz,and  its power is about 10dBm. There is an attenuator of 45 dB between the RP and the signal generator so the power of the input signal received by the RP is in the order of -35dBm. Further attenuating the input signal does not solve the issue. I have also tried setting the gain to 0dB with the option --gain 0 but no improvement either. \r\n\r\nIf the problem is not (or not only) with SDR transceiver, my next step will be to report the problem to the developper of the qspectrumanalyzer & soapy_power applications\r\n\r\n\r\nRegards\r\nPeter\r\n\r\nPS: No network throughput issues, I use a dedicated router to handle the traffic between the PC and the RP.\r\n\r\n![soapy1](https://user-images.githubusercontent.com/14941529/38762235-6b2e7d44-3f8a-11e8-85f7-1aec210c8fa7.png)\r\n![soapy2](https://user-images.githubusercontent.com/14941529/38762237-6cb07da2-3f8a-11e8-80de-87249a3db6a3.png)\r\n![soapy3](https://user-images.githubusercontent.com/14941529/38762240-6e597104-3f8a-11e8-8e3d-b8f4bfe7b3fa.png)\r\n\r\n"},"comment":{"url":"https://api.github.com/repos/pavel-demin/red-pitaya-notes/issues/comments/381323820","html_url":"https://github.com/pavel-demin/red-pitaya-notes/issues/695#issuecomment-381323820","issue_url":"https://api.github.com/repos/pavel-demin/red-pitaya-notes/issues/695","id":381323820,"user":{"login":"pavel-demin","id":8037893,"avatar_url":"https://avatars1.githubusercontent.com/u/8037893?v=4","gravatar_id":"","url":"https://api.github.com/users/pavel-demin","html_url":"https://github.com/pavel-demin","followers_url":"https://api.github.com/users/pavel-demin/followers","following_url":"https://api.github.com/users/pavel-demin/following{/other_user}","gists_url":"https://api.github.com/users/pavel-demin/gists{/gist_id}","starred_url":"https://api.github.com/users/pavel-demin/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pavel-demin/subscriptions","organizations_url":"https://api.github.com/users/pavel-demin/orgs","repos_url":"https://api.github.com/users/pavel-demin/repos","events_url":"https://api.github.com/users/pavel-demin/events{/privacy}","received_events_url":"https://api.github.com/users/pavel-demin/received_events","type":"User","site_admin":false},"created_at":"2018-04-14T11:51:49Z","updated_at":"2018-04-14T11:51:49Z","author_association":"OWNER","body":"I've just tried to run qspectrumanalyzer and I've obtained some reasonably looking spectra with the following settings:\r\n - sample rate: 1.250 MHz\r\n - start frequency: 1.000 MHz\r\n - stop frequency: 50.000 MHz\r\n - bin size: 1.000 kHz\r\n - interval: 10 s\r\n - crop: 20 %\r\n"}}
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