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GET /hyperkitty/api/list/[email protected]/email/4HQGRJZRY4AD6FVBFNYECGUVHPFXN35Z/
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/4HQGRJZRY4AD6FVBFNYECGUVHPFXN35Z/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "4HQGRJZRY4AD6FVBFNYECGUVHPFXN35Z", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/4HQGRJZRY4AD6FVBFNYECGUVHPFXN35Z/", "sender": { "address": "rnutter (a) networkref.com", "mailman_id": "9d4409219c4248a6be735e65e52a44fc", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/9d4409219c4248a6be735e65e52a44fc/emails/" }, "sender_name": "Ronald Nutter", "subject": "[amsat-bb] Re: Feedback on downlink on VO-52", "date": "2008-04-01T15:12:03Z", "parent": null, "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "I am using seperate antennas and feedlines. For the time being, I am \nusing a Channel Master antenna to turn the antennas. I have a pvc pipe \nrig setup with the antennas at an angle of 25 degrees due to the clutter \nin the neighborhood I have to clear to see the sats. I hope to have a \ntower in the future but with being laid off from my job, cant really \nhave any expenditures right now.\n\nI have the cat interface for the IC910H but havent looked into how to \nset it up yet.\n\nRon\nKA4KYI\n\nGeorge Henry wrote:\n> -----Original Message-----\n>> From: Ronald Nutter <[email protected]>\n>> Sent: Mar 31, 2008 10:40 PM\n>> To: AMSAT-BB <[email protected]>\n>> Subject: [amsat-bb] Feedback on downlink on VO-52\n>>\n>> Thanks to the help of several on this listserv, I was able to get a \n>> contact on VO-52 until I lost coordination on keeping the rotor turned \n>> and the IC910H tweaked the right way on the VFO's. I had problems \n>> finding my downlink because of what I think is desensing on the 2M downlink.\n>>\n>> Can I resolve this by putting a filter on the 2M receive to stop the \n>> desensing like I would on the UHF receive on the FM birds ? If not, is \n>> there another way to fix the problem ?\n>>\n>> Thanks to W0EOZ for putting up with me while I was trying to figure \n>> things out. Hopefully my next contacts will last a bit longer <G>.\n>>\n>> Ron\n>> KA4KYI\n> \n> Are you using separate 2 meter and 70 cm antennas with separate feedlines, or diplexing onto a single feedline to a single antenna? First thing to do is reduce your uplink power as much as possible while still being heard. If you are diplexing to a single feedline, you only have about 60dB or so of isolation, so too much uplink power can exceed that. You should be able to work VO-52 with 25 watts or less...\n> \n> I have never experienced desense on 2 meters from my 70 cm uplink... only the reverse, which can be cured with separate feedlines and antennas, ample separation between the antennas, and the diplexer-as-filter trick found at <http://www.amsat.org/amsat-new/articles/Mode-J/>\n> \n> And I strongly recommend buying or building a CAT interface and letting your tracking program take care of tuning the radio (and turning the rotors, if you buy or build a rotor interface as well). The demo version of SatPC32 is fully functional except for saving your station parameters, and can be downloaded from <www.dk1tb.de/indexeng.htm>.\n> If you like it, register it: all proceeds go directly to AMSAT. A CAT interface PC board with the harder-to-find chips included is available from <www.farcircuits.net> and only costs about $20 to build. The FOD-Track rotor control PC board is also available from Far Circuits, and will cost $45 - $50 to build. The LVB Tracker is available thru the AMSAT store, and has the advantage of being able to operate without a computer attached... nice for mobile ops!\n> \n> Go for the radio control first: that'll free you up to deal with the rotors manually, and they demand far less attention than tuning does.\n> \n> 73,\n> George, KA3HSW\n> \n> \n> \n> \n", "attachments": [] }