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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VOUUR2L5N4AMBPLQJHKELTEIWQ6EL7VP/?format=api",
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    "message_id": "BY3PR13MB47884088B5C0511E27274AE0EF212@BY3PR13MB4788.namprd13.prod.outlook.com",
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    "sender": {
        "address": "bstrick (a) N5BRG.COM",
        "mailman_id": "953542c988dd4c549175bb02a8a6a1ed",
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    "sender_name": "Bob Stricklin",
    "subject": "[pacsat-dev] Re: Blinky Transmiter",
    "date": "2024-03-06T15:52:44Z",
    "parent": null,
    "children": [],
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    "content": "Jim,\n\nI sacrificed one of the little jumpers with the black thin coax.  I probably should not cut more. I was going to order more from China but have not yet.\n\nScope is HP 54522A  500 MHz. Purchased on eBay.\n\nBob\n________________________________\nFrom: Jim McCullers via pacsat-dev <[email protected]>\nSent: Wednesday, March 6, 2024 9:00 AM\nTo: Bob Stricklin <[email protected]>; 'Pacsat Dev' <[email protected]>\nSubject: [pacsat-dev] Re: Blinky Transmiter\n\n\nThanks for the box.  At the moment it’s hanging.\n\nThe smallest coax I have is RG-174.  I do have a few connectors with the same you use on the board to SMA and can sacrifice one except the coax is the transparent stiff variety, not certain of the number.\n\nIf your is more flexible and you can space an few inches send some with the box.  Otherwise I can make something work.  Need to raid the scrap cable bin.\n\n\n\nWhat scope do you have?  Now wish I had bought a 200mhz but settled for 100 and 4-channels analog.  Digital scope is also 100mhz.\n\n\n\nHope to finish my RF probe tonight and test.\n\n\n\nJim\n\n\n\n\n\nJim, Thanks for your report.\n\n\n\nI did reconnect the transformer to the 4X splinters using the fine coax and things seem to be working fine that way. I have not tried it with packet data yet but will do that when I can.\n\n\n\nThe image below is the dif input to one of the receivers. The south trace is offset by 1 cm so we can it it better. Phasing looks good. Noise is due to poor ground in my setup mostly I feel.\n\n\n\nI received my 3D printer and I have printed three more of the plastic boxes for the programming board. I will mail you and Chris one maybe tomorrow.\n\n\n\nBob\n\n\n\n\n\n[cid:[email protected]]\n\n\n\nOn Mar 5, 2024, at 4:02 PM, Jim McCullers via pacsat-dev <[email protected]<mailto:[email protected]>> wrote:\n\n\n\nI did some analysis on Blinky’s transmitter last night and did not see the spurs Bob saw on his board.\n\nMy experience with using a spectrum analyzer close in looking for spurs or phase noise is limited so more analysis is needed.\n\n\n\nI did look at the harmonics and the second was down 48 db from the fundamental (+15 to -33 dbm).\n\nThe third harmonic was in the noise and undetectable.\n\n\n\nNow, for receiver board surgery.\n\n\n\nJim McCullers\n\nWA4CWI\n\n-----------------------------------------------------------\n\npacsat-dev mailing list -- [email protected]<mailto:[email protected]>\nView archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected]\nTo unsubscribe send an email to [email protected]<mailto:[email protected]>\nManage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org<https://mailman.amsat.org/>\n\n\n\n\n",
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