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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FYILAYRPAR63IW5O4XV72Y7MZRN5LAWD/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "FYILAYRPAR63IW5O4XV72Y7MZRN5LAWD",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/SVYWA7YCNN7764SIXF4PWT6TBBCSIDY5/",
    "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: Downlink issue with Icom IC-910H",
    "date": "2008-03-31T03:19:50Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7UEH4ZCRS7BSVKPWAOOWAYX2XWOUJF4U/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Jeff/Bruce:\n\nThanks to both of you for your reply.  I put things together kinda quick \ntoday, so I skipped the one little step about putting the filter in.  I \nam using UHF side of a Comet CF-160 Duplexer.  At some point I might \nchange to a \"dedicated\" filter but since I have been recently laid off, \nthat expense will need to wait a while.\n\nThanks,\nRon\n\nJeff Mock wrote:\n> \n> \n> Ronald Nutter wrote:\n>> After not having used my IC-910H for a while due to moving across \n>> country, I unpacked it tonight and setup my antennas.  I was able to \n>> make contacts on SO-50 and AO-51 with one small problem.  I can hear \n>> signals on the downlink but not mine.  When I transmitted, all I could \n>> hear was some white noise when I was transmitting.  I head several \n>> exchanges but it was like I was in half duplex.  This was a working \n>> system before the move.\n>>\n>> I have good quality coax running from the IC-910H to an ICOM preamp \n>> for each side (VHF or UHF) and then running to the antennas.  I \n>> believe that I have used all of the original coax but I could be \n>> wrong.  The only thing I havent put in place was my mode J filter on \n>> the UHF downlink. Could this be causing my problem with not hearing my \n>> signal on the downlink but hearing those who are calling me ?  Sorry \n>> for what is probably a stupid question but I am getting all the kinks \n>> worked out in my setup before Field Day.\n>>\n> \n> I think the lack of a filter on the 70cm downlink might be the problem. \n>  I started out without any filter on the 70cm downlink, I added a DCI \n> 70cm bandpass filter because of local QRM from commercial radios and it \n> also improved my ability to hear the downlink on my 910H.  As you \n> suspect, the 2m transmit might be desensing the 70cm receiver or preamp.\n> \n> I tested this by listening to a weak faraway 70cm repeater while \n> transmitting on a clear portion of the 2m band.  You can do this with \n> and without the 70cm preamp and hear if the receiver is desensing. I \n> found that the filter made my troubles go away.\n> \n> jeff\n> AD6EO\n> \n> \n",
    "attachments": []
}