{"action":"created","issue":{"url":"https://api.github.com/repos/sinara-hw/sinara/issues/560","repository_url":"https://api.github.com/repos/sinara-hw/sinara","labels_url":"https://api.github.com/repos/sinara-hw/sinara/issues/560/labels{/name}","comments_url":"https://api.github.com/repos/sinara-hw/sinara/issues/560/comments","events_url":"https://api.github.com/repos/sinara-hw/sinara/issues/560/events","html_url":"https://github.com/sinara-hw/sinara/issues/560","id":331098068,"node_id":"MDU6SXNzdWUzMzEwOTgwNjg=","number":560,"title":"Sayma: HMC830 output spectrum","user":{"login":"hartytp","id":21218399,"node_id":"MDQ6VXNlcjIxMjE4Mzk5","avatar_url":"https://avatars0.githubusercontent.com/u/21218399?v=4","gravatar_id":"","url":"https://api.github.com/users/hartytp","html_url":"https://github.com/hartytp","followers_url":"https://api.github.com/users/hartytp/followers","following_url":"https://api.github.com/users/hartytp/following{/other_user}","gists_url":"https://api.github.com/users/hartytp/gists{/gist_id}","starred_url":"https://api.github.com/users/hartytp/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hartytp/subscriptions","organizations_url":"https://api.github.com/users/hartytp/orgs","repos_url":"https://api.github.com/users/hartytp/repos","events_url":"https://api.github.com/users/hartytp/events{/privacy}","received_events_url":"https://api.github.com/users/hartytp/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2018-06-11T08:50:34Z","updated_at":"2018-06-11T15:04:05Z","closed_at":null,"author_association":"COLLABORATOR","body":"- [ ] To do: check HMC830 noise spectrum\r\n\r\nWith current ARTIQ master (4.0.dev+1133.g0b086225), looking at J89 + J59 through an AC-coupled TCM-43X+, I see:\r\n\r\n![20180611_094239](https://user-images.githubusercontent.com/21218399/41221825-35ee65d0-6d5d-11e8-8df0-587205e26231.jpg)\r\n\r\nWide span (10kHz RBW). All looks good apart from the non-harmonic spur at 1.89GHz something like -60dBc.\r\n\r\n![20180611_094454](https://user-images.githubusercontent.com/21218399/41221860-4f6a567c-6d5d-11e8-93be-080a325c1720.jpg)\r\nNarrower span, including fundamental and first harmonic.\r\n\r\n![20180611_094908](https://user-images.githubusercontent.com/21218399/41221888-6479fc20-6d5d-11e8-8c9b-75afcadfbd1a.jpg)\r\n1MHz span around fundamental, 100Hz RBW. See some spurs at around 100kHz. I think these are SMPS spurs. @gkasprow can you confirm that? May need better power supply filtering or a layout tweak to remove them."},"comment":{"url":"https://api.github.com/repos/sinara-hw/sinara/issues/comments/396276060","html_url":"https://github.com/sinara-hw/sinara/issues/560#issuecomment-396276060","issue_url":"https://api.github.com/repos/sinara-hw/sinara/issues/560","id":396276060,"node_id":"MDEyOklzc3VlQ29tbWVudDM5NjI3NjA2MA==","user":{"login":"hartytp","id":21218399,"node_id":"MDQ6VXNlcjIxMjE4Mzk5","avatar_url":"https://avatars0.githubusercontent.com/u/21218399?v=4","gravatar_id":"","url":"https://api.github.com/users/hartytp","html_url":"https://github.com/hartytp","followers_url":"https://api.github.com/users/hartytp/followers","following_url":"https://api.github.com/users/hartytp/following{/other_user}","gists_url":"https://api.github.com/users/hartytp/gists{/gist_id}","starred_url":"https://api.github.com/users/hartytp/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hartytp/subscriptions","organizations_url":"https://api.github.com/users/hartytp/orgs","repos_url":"https://api.github.com/users/hartytp/repos","events_url":"https://api.github.com/users/hartytp/events{/privacy}","received_events_url":"https://api.github.com/users/hartytp/received_events","type":"User","site_admin":false},"created_at":"2018-06-11T15:04:05Z","updated_at":"2018-06-11T15:04:05Z","author_association":"COLLABORATOR","body":"The 1.9GHz spur is still there while the board is being flashed and no clock is applied."}}
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