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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/YUZXK2EB2GLOUQ7Q242B3E45KWPFZQDM/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "YUZXK2EB2GLOUQ7Q242B3E45KWPFZQDM",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/YJM2OQK24IJMOESHO3QUWUW2AACO52JQ/?format=api",
    "sender": {
        "address": "tosca005 (a) umn.edu",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "[email protected]",
    "subject": "[amsat-bb] Re: Who is using a IC-910 with Maspro Antennas?",
    "date": "2012-11-21T16:50:10Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BPBJXT3H55OIH6QDACW6R7HLOEF3WOAE/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HSQVVAVMOY5K6CTEF5H54VQY7IC45BH2/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Note that Jan is specifically asking about VO-52 (mode UV), *NOT* FO-29 \n(mode VU). There is a big difference. When the uplink is VHF, the third \nharmonic of 145 MHz is 435 MHz so desense is often a problem. I have always \nnoticed that difficulty with my FT-847 on FO-29 in the absence of external \nfiltering, but a desense filter (filter out the 435 MHz harmonic from the \n145 MHz side of the radio) is very helpful. But on mode UV, the transmitter \nis in the 435 MHz band and so interference in the 145 MHz band should be \nsmall. I have always found it extremely easy to operate VO-52 on my FT-847 \nwithout any particular extra filtering, unlike FO-29. And it sounds like \nJan likewise was successful in working VO-52 in the past with his (now \neliminated) FT-847.\n\nSo, this leads me to believe that Jan's system does have some problem. I am \nnot familiar with either the IC-910 or the Maspro antennas, so I can't \ndiagnose further. Separate bandpass filters on the VHF and UHF sides of the \nradio can likely help, but there may be more to the problem than meets the \neye. At least it seems so from my state of ignorance about his specific \nequipment.\n\n73 de W0JT\nJohn P. Toscano\n\nOn Nov 21 2012, Dimitry Borzenko wrote:\n\n>Hello Jan.\n>\n>Try \"Desense\" filter.\n>More info here - http://www.amsat.org/amsat-new/articles/Mode-J/\n>\n>Regards.\n>\n>\n>-----Original Message-----\n>From: [email protected] [mailto:[email protected]] On\n>Behalf Of PE0SAT | Amateur Radio\n>Sent: Tuesday, November 20, 2012 8:12 PM\n>To: Amsat bb\n>Subject: [amsat-bb] Who is using a IC-910 with Maspro Antennas?\n>\n>Hi,\n>\n>Thanks for reading this message. I have exchanged my FT-847 for an \n>IC-910H and now when I try to\n>work VO-52 my UHF uplink signal interferes with the VHF downlink. Are \n>the any people out there that\n>experience the same with this combination?\n>\n>I tried with and without pre-amp, RHCP and LHCP but the problems \n>doesn't go away :(\n>\n>\n>I do know that there can be problems when working FO-29 and a mode-j \n>filter can solve this, but I\n>never experiences this when working VO-52.\n>\n>\n>73 Jan PE0SAT\n>\n>\n",
    "attachments": []
}