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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/LIKNLXT3DWO6JWJK3D64V6TZ6HBWLAMG/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "CAJUhCTOXnBPtGeY02qsrDs=dG9MVgy8OG3JRi_W5ujb-i5zNRA@mail.gmail.com", "message_id_hash": "LIKNLXT3DWO6JWJK3D64V6TZ6HBWLAMG", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/NDQXJI5NGX65HJ6PRTVVAADN7XDT7MPD/", "sender": { "address": "normanlizeth (a) gmail.com", "mailman_id": null, "emails": null }, "sender_name": "Norm n3ykf", "subject": "Re: [amsat-bb] LMR-400 direct to antenna or no?", "date": "2016-04-01T02:18:25Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JZRWYCPKYQPWM3QSZTHYOGIIGWRNZ6TA/", "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "I use LMR-400 DB on the VHF side. With a 130' run it's lossy.\nPreviously, it was on both UHF and VHF.\n\nReplaced the UHF side with LDF4-50A that was dumpster retrevial just\nafter an unnamed blue and white railroad ran their last train out.\nMuch better.\n\nWith a 130' run was lossy at UHF. Preamp is necessary. On the VHF\nside, a preamp is usually un-necessary.\n\nRotator loops are 9913F7. Be sure to get the correct N connectors as\nthis has a larger center conductor. Several stranded strands can be\ntrimmed if they are unavailable.\n\n\n\nOn Thu, Mar 31, 2016 at 9:43 PM, w4upd <[email protected]> wrote:\n> I would do like I did to my 9913. This is rather stiff cable. I went a\n> couple of turns loosely around the mast and around the boom for elevation. I\n> would do this with the antennas at 0 elevation and 360/0 degree azimuth. In\n> this way it acts like a simple spring which opens or tightens slightly as\n> the rotation of the mast and/or boom occur. I had my 9913 this way for over\n> 15 years without a problem. I suspect the LMR400 should work the same. In\n> this way you are not inducing any losses with additional cables and\n> connectors.\n>\n> Just my two cents.\n>\n> Reid, W4UPD\n> Amsat: 17002\n>\n>\n>\n> On 3/31/2016 9:35 PM, Scott wrote:\n>>\n>> I hope to put up my first rotating antenna soon and just received a nice\n>> length of LMR-400 to use. (regular, not \"super-flex\")\n>>\n>> Having never seen LMR-400 before, I did not know how flexible it would be.\n>> I would call it \"medium\"... not stiff as a pipe but not floppy, either.\n>>\n>> My question is whether anyone using LMR-400 can recommend whether I should\n>> attach it directly to my antenna (with slack loops, of course)?\n>>\n>> Or, should I get a few meters of something more flexible to attach to an\n>> antenna that needs to be free to rotate 360 degrees?\n>>\n>> If a jumper is recommended, I would appreciate suggestions on what cable\n>> would work best for the task. The frequency for this project is 70cm.\n>>\n>> Thanks!\n>>\n>> -Scott, K4KDR\n>> Montpelier, VA USA\n>> _______________________________________________\n>> Sent via [email protected]. AMSAT-NA makes this open forum available\n>> to all interested persons worldwide without requiring membership. Opinions\n>> expressed\n>> are solely those of the author, and do not reflect the official views of\n>> AMSAT-NA.\n>> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n>>\n>\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions\n> expressed\n> are solely those of the author, and do not reflect the official views of\n> AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n", "attachments": [] }