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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CKPFQP5F3KZHVB3G3KBS3LMWFAF33CFQ/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "CKPFQP5F3KZHVB3G3KBS3LMWFAF33CFQ", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/CKPFQP5F3KZHVB3G3KBS3LMWFAF33CFQ/", "sender": { "address": "lapid (a) netvision.net.il", "mailman_id": "ed6036fa853e4626a35842ee37fb798a", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/ed6036fa853e4626a35842ee37fb798a/emails/" }, "sender_name": "Peleg Lapid", "subject": "[amsat-bb] Re: AMSAT-BB Digest, Vol 2, Issue 840", "date": "2007-12-26T22:06:03Z", "parent": null, "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Try to reduce the comunication bit rate to minimum, it helped for me with\nthe 857\n73\nPeleg 4x1gp\n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of [email protected]\nSent: Wednesday, December 26, 2007 10:00 PM\nTo: [email protected]\nSubject: AMSAT-BB Digest, Vol 2, Issue 840\n\nSend AMSAT-BB mailing list submissions to\n\[email protected]\n\nTo subscribe or unsubscribe via the World Wide Web, visit\n\thttp://amsat.org/mailman/listinfo/amsat-bb\nor, via email, send a message with subject or body 'help' to\n\[email protected]\n\nYou can reach the person managing the list at\n\[email protected]\n\nWhen replying, please edit your Subject line so it is more specific than\n\"Re: Contents of AMSAT-BB digest...\"\n\n\nToday's Topics:\n\n 1. Re: RigExpert Tiny to Yaesu FT-847 (Alan P. Biddle)\n 2. Re: Questions on physically offset CP yagi feeding (i8cvs)\n 3. Yaesu FT-897 and HRD satellite tracking problem (Dave Matthews)\n 4. Ande. (John Ronan)\n 5. Re: Yaesu FT-897 and HRD satellite tracking problem\n (Simon Brown (HB9DRV))\n\n\n----------------------------------------------------------------------\n\nMessage: 1\nDate: Tue, 25 Dec 2007 15:19:41 -0600\nFrom: \"Alan P. Biddle\" <[email protected]>\nSubject: [amsat-bb] Re: RigExpert Tiny to Yaesu FT-847\nTo: \"'Amsat-Bb'\" <[email protected]>\nMessage-ID: <000001c8473b$dd3f60e0$6401a8c0@WA4SCA>\nContent-Type: text/plain;\tcharset=\"us-ascii\"\n\nRod,\n\nTake a look at http://www.usinterface.com/naviusa_007.htm for a wide variety\nof cables for the full RigExpert. (The Navigator uses the same pin out.)\nThey should give you some good ideas for the Tiny. Note that the FT-847 has\nthe cables for the PKT and DATA ports wired in parallel, so you will need\nswap the plugs depending on what mode you are operating. Or, as I did, wire\nup a simple AB switch. Note that for the PKT connection to use the 1200\nbaud RX. Several of the RE sites have the wiring incorrectly using the 9600\nbaud output. It will work, somewhat, but with a very poor S/N. The\ninterface will not handle 9600 baud. \n\n73s,\n\nAlan\nWA4SCA\n\n\n\n\n\n------------------------------\n\nMessage: 2\nDate: Wed, 26 Dec 2007 00:04:29 +0100\nFrom: \"i8cvs\" <[email protected]>\nSubject: [amsat-bb] Re: Questions on physically offset CP yagi feeding\nTo: \"jonny 290\" <[email protected]>, \"AMSAT-BB\" <[email protected]>\nMessage-ID: <[email protected]>\nContent-Type: text/plain;\tcharset=\"iso-8859-1\"\n\n----- Original Message -----\nFrom: \"jonny 290\" <[email protected]>\nTo: <[email protected]>\nSent: Monday, December 24, 2007 10:59 PM\nSubject: [amsat-bb] Questions on physically offset CP yagi feeding\n\n> I've decided to rebuild my 2m antenna and have a couple of questions.\n>\n> My thinking is to build a six element wide-band 50 ohm match yagi and \n> mount the vertically polarized elements 1/4 wavelength ahead of the \n> horizontal ones, and feed the elements in phase.\n\nHi Matt, KC4YLV\n\nMounting the vertical and horizontal elements with an offset of 1/4\nwavelength over the boom is good because feeding the driven elements in\nphase you get almost a one sense CP without adding delay lines.\n.\n> I have\n> examined the possibility of masthead CP phasing, but am concerned \n> about mismatching and like the arguments given for the physically \n> offset, in-phase fed elements.\n\nThere are masthead CP phasing and switching circuits with a minimum of\nmismatching and in addition the lenght of coax relays is not to be taken\ninto account because the length of relays is compensated for provided all\nrelays are of the same type and the same lenght.\nAs an example using 4 coax relays of the same type antenna mounted you can\nswitch from the shack V-H-RHCP and LHCP as described into the AMSAT-Journal\nmarch/april 2007 and may/june 2007\n>\n> My antenna to radio coax run is right around 30 feet. I am thinking of \n> running two lengths of LMR-240, speced at 3 dB loss/100ft, so loss \n> should be about 1 dB. If I cut the two feedlines to identical lengths, \n> I should be able to connect them with a coax tee in the shack and use \n> a\n> 1/4 wave 37 ohm line to bring the system impedance back up from 25 (at \n> the tee) to 50 ohms.\n\nThis is correct but you must be able to exactly cut two runs of coax cable\n30 feet long and having the same electrical lenght and first of all it is\ngood to use both coax lines coming from the same coil and if you have access\nto a network analyser you can check if the phase difference between both\nfeed lines is 0? degrees or not.\n\n> I'd then have an RHCP signal for the birds.\n\nIf the vertical driven element is ahead of the horizontal one to get RHCP\nthe center conductor of the coax cable feeding the vertical driven element\nmust be connected UP and the braid DOWN while looking the elements standing\nbehind the reflector the inner conductor of the coax cable feeding the\nhorizontal driven element must be connected to the RIGHT side and the braid\nto LEFT side.\nSince you plan to run two identical coax lines from the shack if you add in\nthe shack a 1/2 electrical wavelenght of coax into the line feeding the\nvertical driving element then you get LHCP without changing any coax\nconnections on top of the dipoles.\nThe use of folded dipoles with the classic 1/2 wavelength coax balun is\nrecommended.\n\n> Do I\n> _need_ to cut the feedlines to half-wave multiples, or is it just a \n> good idea? I plan on tuning the antennas as dead on to 145.8 as I can, \n> so mismatch will be a minimum at that frequency.\n\nIn theory if you cut the feedlines to half-wave multiples you only have the\nadvantage to exacly measure the impedance of the antenna with an impedance\nbridge from the shack without to go on the roof and disconnect cables from\nthe dipoles.\nBy the way the VSWR into the line do not change cutting feed lines to\nhalf-wave multiples or any other lenght if the impedance of the antenna do\nnot match with the impedance of the coax line.\n>\n> When I don't need RHCP, I can simply use the horizontal feedline for \n> SSB work and the vertical feedline for FM work, setting the coax tee \n> nonsense aside.\n\nIt is correct\n\n> (as a note, the two sets of elements would be tuned identically, \n> centered for minimum swr on 145.8,\n\nIt is good\n\n> but in my experience\n> operation across the band is no problem).\n>\nAgree\n\n> A good coax relay costs about 60-80 dollars and requires associated \n> mounting hardware and weatherproofing, this only adds another $15 for \n> 30 more feet of LMR240.\n\nSince your need is satellite and tropo your project sound to be good and\nsimple.\n>\n> Anybody care to share thoughts on this?\n>\n> 73 and merry christmas\n> matt kc4ylv\n>\n73\" and merry cristmas from\n\ni8CVS Domenico\n\n\n\n\n\n\n\n------------------------------\n\nMessage: 3\nDate: Tue, 25 Dec 2007 18:09:39 -0600\nFrom: Dave Matthews <[email protected]>\nSubject: [amsat-bb] Yaesu FT-897 and HRD satellite tracking problem\nTo: [email protected]\nMessage-ID: <[email protected]>\nContent-Type: text/plain; charset=ISO-8859-1; format=flowed\n\nMerry Christmas everyone. And apologies since I expect the question I ask\nhere is old hat, but I've researched everywhere and still can't find a\nsolution that works:\n\nWhen using the Ham Radio Deluxe satellite tool for satellite tracking with\nautomatic Doppler shift adjustment, I have a periodic 'polling?'\nnoise issue with my Yaesu FT-897, the same as I had last field day with HRD\nand a FT-857. There is a periodic noise burst that coincides with the black\nsquare animation on the upper left of the satellite tracking tool screen.\nThis noise burst makes it impossible to listen to very faint signals, and is\nannoying as all get out when waiting for a satellite to come into range. FM\nand SSB modes. I want to use the HRD program with its built in Doppler shift\ntracking, but it is unusable -for me- as a result of this problem.\n\nDuring Field Day the FT-857 rig was controlled by a laptop, and yagis were\nabout 20' away pointing at the sky. This current FT-897 setup is on a\ndesktop style office computer into eggbeaters warming the clouds.\n\nMy CT-62 interface cable is shielded, but the shield was not connected!\nI tied the shield to ground, no difference. The RS-232 extension cable used\nis also shielded. Grounds are good in this upstairs office shack but I am\nabout 12' above the ground rod. Trying different grounding makes no\ndifference. Ferrite Beads on the comm cable, looped multiple times through\nthe beads, etc. makes absolutely no difference. And I just tried a USB to\nserial interface replacing the RS-232 from the computer, no difference. So\nI've shielded and beaded and grounded and experimented to no avail.\n\nThis is a really annoying problem, and I feel there must be something\nelementary that I am missing either in the FT-897 setup or in HRD. I expect\nit is a Yaesu FT-897/857 problem, but again it may just be a setup issue.\n\nAny response is appreciated,\nDave KI4PSR\n\n\n------------------------------\n\nMessage: 4\nDate: Wed, 26 Dec 2007 15:44:28 +0000\nFrom: John Ronan <[email protected]>\nSubject: [amsat-bb] Ande.\nTo: AMSAT-BB BB <[email protected]>\nMessage-ID: <[email protected]>\nContent-Type: text/plain; charset=US-ASCII; format=flowed\n\nHas it's fate been ascertained?\n\nRegards\nde John\nEI7IG\n\n\n------------------------------\n\nMessage: 5\nDate: Wed, 26 Dec 2007 19:14:55 +0100\nFrom: \"Simon Brown \\(HB9DRV\\)\" <[email protected]>\nSubject: [amsat-bb] Re: Yaesu FT-897 and HRD satellite tracking\n\tproblem\nTo: \"Dave Matthews\" <[email protected]>, <[email protected]>\nMessage-ID: <002001c847eb$37d34b20$a400a8c0@hairycreatures>\nContent-Type: text/plain; format=flowed; charset=\"iso-8859-1\";\n\treply-type=original\n\nSounds like radiation from the CT-62 cable - try putting a ferrite or two on\nthe cable.\n\nSimon Brown, HB9DRV\n\n----- Original Message -----\nFrom: \"Dave Matthews\" <[email protected]>\n\n> I have a periodic 'polling?' noise issue with my Yaesu FT-897\n\n\n\n------------------------------\n\n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT member? Join now to support the amateur satellite program!\nhttp://amsat.org/mailman/listinfo/amsat-bb\n\n\nEnd of AMSAT-BB Digest, Vol 2, Issue 840\n****************************************\n\n", "attachments": [] }