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GET /hyperkitty/api/list/[email protected]/email/E7PGJANRP4RF55HIK3TA6TO2C5EXL6I7/
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/E7PGJANRP4RF55HIK3TA6TO2C5EXL6I7/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "E7PGJANRP4RF55HIK3TA6TO2C5EXL6I7", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/E7PGJANRP4RF55HIK3TA6TO2C5EXL6I7/", "sender": { "address": "ko6th_greg (a) hotmail.com", "mailman_id": null, "emails": null }, "sender_name": "Greg D.", "subject": "[amsat-bb] Re: Suggestions for Mode L antenna", "date": "2008-05-13T02:45:45Z", "parent": null, "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FGWHTLMO4LO5GTBQL6ANHSZFHN2CGR6D/" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "\nHi Ron,\n\nI built the helix because they are fairly tolerant of slight differences in materials and assembly dimensions. I am by no means a precision builder, so this seemed right for me.\n\nI have an ICOM 1271A in the shack, which is supposed to put out about 10 watts. This goes to about 5 feet of RG-214 (I think - it's the 50 ohm stuff that looks like RG-8, but has better shielding), to a box outside where there's supposed to be a lightning arrestor. That's on my list of things-to-buy-soon... Right now the arrester is just an N-N barrel connector. That feeds about 60' of Andrew hardline (LDF4-50A) up to the roof, where there is another barrel connector and another about 5' of that RG-214 to go around the antenna rotor to the antenna itself.\n\nAt 1.2 ghz and 50-odd feet, I expect that hardline is going to be a requirement. Or you could mount a power amp and pre-amp at the other end of the coax, along with power and sequencing logic. The hardline I got was a trade from another ham who worked, I'm guessing, in the CATV, Telephone, or similar industry. I got something like 180 feet of it in trade for a short 70cm antenna, enough for 3 runs to the roof. There was a bit of a kink in the middle, so that run is on a lower band :-). Ask around, you might be able to scrounge up something.\n\nGood luck,\n\nGreg KO6TH\n\n\n----------------------------------------\n> Date: Mon, 12 May 2008 07:50:44 -0500\n> From: [email protected]\n> To: [email protected]\n> CC: [email protected]\n> Subject: Re: [amsat-bb] Re: Suggestions for Mode L antenna\n>\n> Greg:\n>\n> Thanks for your option. My antenna building abilities havent been the\n> best, so I am looking at commercially made antennas.\n>\n> What type of coax/feedline should I use ? I will probably have the run\n> under 50 ft. I would hope I dont have to use hardline as that will\n> probably be very expensive with the price of copper. As I get close to\n> the antenna, should I shift over to a different type of coax/feedline so\n> that I can rotate the antenna to track AO-51 ?\n>\n> Ron\n> KA4KYI\n>\n> Greg D. wrote:\n>> Hi Ron,\n>>\n>> I've done ok on AO-51 with a homemade helix. See http://home.wavecable.com/~ko6th at the bottom of the page. I also have watts in the shack, but a full az/el rotor system. I don't know how sharp the pattern is for the helix, so I don't know how effective a fixed elevation system will be. But from the reports I've received, the 10 watts and my 60' of hardline with about 7 feet of RG-214 at each end seems to be quite adequate.\n>>\n>> Good luck,\n>>\n>> Greg KO6TH\n>>\n>> ----------------------------------------\n>>> Date: Sun, 11 May 2008 20:49:23 -0500\n>>> From: [email protected]\n>>> To: [email protected]\n>>> Subject: [amsat-bb] Suggestions for Mode L antenna\n>>>\n>>> I am considering purchasing the 1.2 ghz module for my IC-910H. For my\n>>> satellite work, I have my antennas angled at about 20 degrees since I\n>>> dont have an az/el rotor. This setup worked reasonably well with Mode S\n>>> this weekend. What are my chances to be able to work Mode L with this\n>>> kind of setup ? Also, I would appreciate any suggestions for an antenna\n>>> that I could use. With only 10 watts, I am not expecting a great signal\n>>> but I would hope to have at least a readable signal. Also, would\n>>> appreciate any suggestions as to coax/feedline that I should look at\n>>> buying ?\n>>>\n>>> Thanks,\n>>>\n>>> Ron\n>>> KA4KYI\n>>> _______________________________________________\n>>> Sent via [email protected]. Opinions expressed are those of the author.\n>>> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n>>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>>\n>> _________________________________________________________________\n>> Windows Live SkyDrive lets you share files with faraway friends.\n>> http://www.windowslive.com/skydrive/overview.html?ocid=TXT_TAGLM_WL_Refresh_skydrive_052008\n>> _______________________________________________\n>> Sent via [email protected]. Opinions expressed are those of the author.\n>> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>>\n\n_________________________________________________________________\nStay in touch when you're away with Windows Live Messenger.\nhttp://www.windowslive.com/messenger/overview.html?ocid=TXT_TAGLM_WL_Refresh_messenger_052008\n", "attachments": [] }