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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6LIMIBP5TQAFBLAXH26Q6TTU5KC5YQ46/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CAJEM475i9io7wwwT3R+e31T7jbj=TRjWUKGTxThW85tzr5Kiew@mail.gmail.com",
    "message_id_hash": "6LIMIBP5TQAFBLAXH26Q6TTU5KC5YQ46",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/6LIMIBP5TQAFBLAXH26Q6TTU5KC5YQ46/",
    "sender": {
        "address": "samudra.haque (a) gmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Samudra Haque",
    "subject": "[amsat-bb] test equipment for an amsat ground station",
    "date": "2014-09-13T14:57:08Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Cross posted to Tacos / Amrad and also Amsat-BB as it may interest\nhomebrewers.\n\nI made a ugly bug (well, The PCB was very nice when I started, and really\nconvoluted when I finished .. ) frequency marker box (from junk parts). I\nwill donate this to K3GWU amateur radio club and research station for\ngeneral use.\n\nI used (what I had) 3.68 MHz, 40 MHz, 50 MHz, 60MHz sealed crystal\noscillator.\n\nI used a voltage regulator and bypass caps to feed power into the units via\nindividual switches, so I can turn on any combination manually of the\noscillators, or all or some at the same time. I then combined the inputs\ninto a common point and from that point used a 10 pF capacitor to get an\noutput to an SMA bulkhead connector through a brass box.\n\nOf course, I then needed a 3.3V regulated output for a microprocessor so I\nput in an additional 3.3V LDO as well inside the bus and all components are\nhappy now. I even put an LED just to satisfy my curiosity and then sealed\nall in a box.\n\nI do see on a simple analog scope all wave forms and my frequency counter\nshows the fundamental frequencies produced. A spectrum analyzer (thank you\nK0BRA) shows different products of the frequencies.Obviously the\nfrequencies I saw were just whatever the crystal oscillators I had on hand,\nso they can be replaced, or added to.\n\nIn this line, what improvements could I do to make it an useful general\npurpose box for testing in the radio shack, and for AMSAT birds, is there\nanything of interest that might be useful to qualify a station ? One could\nuse a microprocessor to switch in circuits, that much I can do, but which\ntype can be used to generate accurate frequency standards ? If only a clock\npulse generator (square wave) source was available, what type of circuit\nwould allow multiple frequencies be slaved to a crystal standard ? Any old\nschematics reference would be appreciated.\n\nI even saw how easy it is to use a audio transformer to modulate the power\nleads and transmit QRP AM on the 0.5m length RF cable. I can now use this\nto verify operation of the RF splitters and combiners.\n\n73 de N3RDX @ K3GWU\n\nif you are in Foggy Bottom area of DC and have an interest in ham radio,\nI'm at GWU.\n",
    "attachments": []
}