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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VK674EZFNCYXFPTC6K6WKWGHDJ67JCQX/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "VK674EZFNCYXFPTC6K6WKWGHDJ67JCQX",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/VK674EZFNCYXFPTC6K6WKWGHDJ67JCQX/",
    "sender": {
        "address": "ross (a) topwire.co.nz",
        "mailman_id": "d9ef72508cbd4a2b812c57a87b7ef26a",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/d9ef72508cbd4a2b812c57a87b7ef26a/emails/"
    },
    "sender_name": "Ross Whenmouth",
    "subject": "Re: [amsat-bb] Modulating UHF Retro Reflector at RF?",
    "date": "2016-08-09T08:50:37Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/276WX74RNQVEFXHRJII5DMZRKC5KUT2R/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Years ago I built a \"moving target simulator\" for a K-band CW (homodyne) \nradar. I simply took the Gunnplexer module out of a K-band automatic \ndoor opener (a 24.125 GHz resonant cavity complete with feed horn, Gunn \ndiode local oscillator and RX mixer diode) and fed my simulated doppler \nAF signal into it's RX mixer diode (I did not energise the Gunn diode - \nso the microwave oscillator was NOT operating).\n\nWhen I illuminated it with 24 GHz RF from the radar, it produced good \nreflections at RF + AF and RF - AF. I did not have access to good K-band \nmicrowave test equipment so I was unable to quantify the strength of the \nreflections or mixing conversion loss, etc.\n\nSo I would say that yes, subject to sufficient link budget, if you had \nan antenna in orbit, coupled to a mixer diode, and you drove that mixer \ndiode with AF modulation, then that antenna will re-radiate the mixing \nproducts of the RF illumination and AF modulation. Would this be an \ninteresting experiment for an ulta-low-power bird that does not have the \npower budget to run an RF transmitter?\n\n\n73 ZL2WRW\nRoss Whenmouth\n",
    "attachments": []
}