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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IPKESKJPYZIDI4II2LBYFWCVVGTSYRY3/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "IPKESKJPYZIDI4II2LBYFWCVVGTSYRY3",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/IPKESKJPYZIDI4II2LBYFWCVVGTSYRY3/",
    "sender": {
        "address": "oh2aue (a) sral.fi",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Michael Fletcher",
    "subject": "[amsat-bb] Re: [Mw] Dish reflector density (and Kaguya)",
    "date": "2007-12-15T15:30:46Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Loren Moline WA7SKT wrote:\n\n> Hello,\n\nHi,\n\nCC:ing AMSAT-BB in case somebody wants to quit\nthe keyboard and do something cool for a change ;-)\n\n> Is there anything that says what the maximum space or hole size in a not solid dish should be.\n\nDepends on the thickness and hence fringe effects (the cutoff\nis half a wavelength, but for all practical reasons (the\n\"thinness\" of the material), you can take 10 - 20 % of the\nfreespace wavelength.\n\n> I have been told that a barbque grill antenna works better if you cover with 1/4\" or smaller hardware cloth adhering to the curvature of the original dish shape.\n\nWell, the grill design is linearly polarised, so for\ncircular polarisation (with a suitable feed also),\nmaking the reflector more complete can give you up to\n3 dB gain (circular over linear).\n\nTonight I used a +- 45 degree linearily polarised\nW-LAN patch, outer dimensions 8 * 10 cm, with a\ncommercial preamp specified at 1.2 dB NF; solid\ncopy with the naked ear, even through double glazing\n(i.e. the antenna is seeing a lot of ambient noise\ntemperature too).\n\nThis thing is extremely difficult to make non-audible\nby the ear. I just did pretty much the ultimate test\nand used a QBFH omnidirectional: no problem hearing\nKaguya by the ear.\n\nWhat this means is you can hear the 2.2 GHz carrier\nfrom the moon whilst mobile, no DSP, SDR, nothing...\n\n> Loren                                                                                                                                                    \n\nMichael, OH2AUE\n\n-- \n\"Life is too short for Sudoku\"\n\n",
    "attachments": []
}