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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/T2QY54D5MCDGPRWWUJFYMEVU3QC6FO47/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "T2QY54D5MCDGPRWWUJFYMEVU3QC6FO47",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/3KJIW45ACMEULMEN2CLUPQAHH75Y5HGU/",
    "sender": {
        "address": "broberts (a) mta.ca",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Bruce Robertson",
    "subject": "[amsat-bb]  S band diagnostics (was Re: AMSAT-BB Digest, Vol 1,\tIssue 112)",
    "date": "2006-09-18T14:21:28Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6YIDEBPBOQ2OGYUN67LSIGPBJX7752A6/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JEKUU22BNG762VCZALNM3VWHDEHSXBFM/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Quoting Michael Tondee <[email protected]>:\n\n> I have tried all week to be able to hear the S-band downlink with a BBQ\n> \n> grill dish and AIDC 3731 converter. I checked aim of my antennas and can\n> \n> receive a signal when a signal source is hanging off the dish but no joy\n> \n> as far as hearing the bird itself. I don't have an antenna for L band \n> yet so I can't transmit.\n>  I'm very discouraged and about ready to yank the dish/downconverter off\n> \n> the mast and give up.\n> 73,\n> Michael, W4HIJ\n\nI would yank them off the mast, but not give up. Others have suggested that\nthe beam width of the setup you describe is quite narrow and might be\nrequiring better pointing than you have right now. Here's a procedure to\nsee what's what.\n\nI have one of the self-modified CalAmp $6 units It works much better\nhand-held than on the mast, and I have just a 8 dBi gain patch antenna on\nit. On future S-band opportunities, I would try pointing the d/c by hand\nwith its feed alone, no dish, and see if that works. If you can hear\nsomething, then I'd say there's a pointing issue. (For the sake of\ncomparison, I can hear part of a 20-30 deg. max el. pass through a window.\nNot good copy, but enough to prove things are tickety-boo while the snow is\nflying.)\n\nIf you can't hear anything at all by this means, I wonder if your d/c is\nsensitive enough. It worries me that your rf source has to be 'hanging off\nthe dish'.  I have an rf source like the one described in the latest Amsat\nJournal, but with no antenna to speak of. I can still hear it as a weak\nsignal indoors through a window about 15' from the antenna when the rotor\nis vaguely pointing my way. When I first was working on the d/c and hadn't\npeaked the filter, the source had to be no more than an inch or two from\nthe d/c. At this point, the d/c wouldn't receive Echo.\n\nSteve, WI2W, gave me some excellent advice, which I think should be shared\nwith others. Noting that our CalAmp $6 d/c's were a bit marginal, he\nrecommended that instead of building a more narrow beamwidth antenna, I\nshould get a mast-installed preamp for 2.4 gig. The plan is to keep my\nbroad-beam antenna (which is better for the LEO situation) and improve my\ngain and noise floor with the preamp. SSB USA has them for $125ish. His is\nthe sensible plan if one's goal is a easy-to-use LEO s band setup. I'm\ninterested in building antennas and such, so I'm working on a 15 turn helix\nand adding elevation control to my rotor. But by the time P3E and ESEO fly,\nI think the preamp will be necessary.\n\nMaybe the next time Echo is transmitting on S band, we'll both have working\nsystems!\n\n73, Bruce\nVE9QRP\n",
    "attachments": []
}