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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/GVZGIFD54KVYYULPZ5XBC3EQA7AUOIBZ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "CAN6TEUeApLRKYo6m54QfUY7p-Vj4OUGfFJ0WqWLSKVTvYBTkGg@mail.gmail.com",
    "message_id_hash": "GVZGIFD54KVYYULPZ5XBC3EQA7AUOIBZ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/GVZGIFD54KVYYULPZ5XBC3EQA7AUOIBZ/?format=api",
    "sender": {
        "address": "amsat-bb (a) wd9ewk.net",
        "mailman_id": "21664df01bef4757931b7cdb42a9e768",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/21664df01bef4757931b7cdb42a9e768/emails/?format=api"
    },
    "sender_name": "Patrick STODDARD (WD9EWK/VA7EWK)",
    "subject": "[amsat-bb] DJ-G7T and full-duplex satellite operating - the 2018\tsequel",
    "date": "2018-02-14T15:58:19Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/QMJCABKXHAQDXPMNB4SWVQ5JRK7XI2BI/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi!\n\nAfter dusting off my old Alinco DJ-G7T for use with AO-92's L/V\nconfiguration, I have been using it for AO-92's U/V mode and on\nother satellites. I wanted to see how it would do with U/V\nsatellites in particular, given how it performed with V/U\nsatellites like AO-27 and AO-51 when I bought the radio in 2009.\nI have also seen some recent comments online stating that this\nradio is good for satellite work. It can be, but only in certain\nsituations.\n\nBack in 2009, I was able to make the DJ-G7T work full-duplex with\nAO-51, with a post titled \"DJ-G7T and full-duplex satellite\noperating\":\n\nhttp://amsat.org/pipermail/amsat-bb/2009-May/019177.html\n\nI turned off the extended (non-ham) receive coverage in my DJ-G7T,\nand it worked. I remember that, even at the city park I used for\nmuch of my operating then, the radio would be very sensitive to\nother signals way outside the 70cm band when working the U/V FM\nsatellites of that time. I never was able to work SO-50 full-duplex\nthen, with its weaker downlink compared to AO-51 and AO-27. After\nalmost 9 years, nothing has changed there. I just tried to work\nSO-50 this morning with the DJ-G7T and Elk log periodic, yet I\nnever even heard the downlink once during a 39-degree pass. The\ndownlink VFO's S-meter was pegged for most of the pass, probably\nfrom some other RF the radio was receiving. Even using the clock-\nshift menu setting didn't improve things. I won't bother using my\nDJ-G7T with SO-50 in the future, unless I have another radio for\nthe downlink.\n\nIn the past couple of years, we have had some U/V FM satellites\n(AO-85, AO-91, AO-92) that we never had back in 2009. Simply switching\nthe uplink and downlink bands has been a cure for receiver desense in\nother radios like the Icom IC-W32 or Wouxun KG-UV9D when trying to work\nfull-duplex, but it's not so simple with the DJ-G7T. Depending on the\npass and the antenna I'm using, I can still have receiver desense on\n2m while transmitting on 70cm to any of these satellites. When I am\nable to overcome the receiver desense on 2m, the DJ-G7T works fine for\nthe U/V FM satellites. This normally means I am using my Elk, and not\nother antennas like the MFJ-1717 long duckie I have used with a few\nother HTs. For higher passes, I am able to use the DJ-G7T with the\nMFJ-1717 and hear myself while transmitting through AO-91 or AO-92,\nbut not near AOS or LOS when the receiver desense covers up the\ndownlink.\n\nIf I am only receiving the 2m downlinks from the 3 current Fox-1\nsatellites, and not trying to transmit to the satellite, the DJ-G7T can\nbe a good receiver. All of this is dependent on the surrounding RF that\nthe DJ-G7T might pick up, of course. What works in one location, may\nnot work the same in another location. I demonstrated this with two\nvideos I recently posted on YouTube. Here is an AO-91 pass from 6\nFebruary:\n\nhttps://www.youtube.com/watch?v=jSK_v3L_RHk\n\nAnd an AO-92 pass, earlier on the same day:\n\nhttps://www.youtube.com/watch?v=E3nfO4tKEAI\n\nI have also posted some audio recordings and pictures of the DJ-G7T used\nwith these two antennas on AO-91 and AO-92 passes in my Dropbox space.\nGo to http://dropbox.wd9ewk.net/ and look for the \"DJ-G7T\" folder. In\nthere, I have subfolders for different passes I have worked with this\nradio. Some of the U/V passes were worked with the Elk as the antenna,\nand some with the MFJ-1717.\n\nAs an uplink radio, the DJ-G7T has performed well with the U/V FM\nsatellites and for AO-92's L-band uplink. I had to increase the mic\ngain from 3 to 4 (maximum), and I have only received good reports on\nmy transmitted audio. My signals may be down a bit on 1.2 GHz if my\ntuning isn't keeping up with the Doppler and AO-92's uplink AFC is\nhaving to work, but I have been getting through with this HT (1W on\n1.2 GHz) and an old 5-band Yagi mounted on the antenna connector.\nI have not tried using this radio for the uplink with SO-50, but I\nam confident that using a DJ-G7T with a different radio for the\ndownlink would also be acceptable for SO-50.\n\nI went back and read through the QST review of this radio from April\n2010. The review mentioned trying this radio on AO-27. The reviewer\nmentioned hearing slight interference when working full-duplex. That\nmust have been done from a very RF-quiet location, and on a very high\npass. When I heard any non-ham intermod on 70cm, that would tend to\ncover up the downlinks from AO-27 or AO-51.\n\nI have liked my DJ-G7T for non-satellite uses, as it is a neat little\nradio which includes 1.2 GHz. This HT, along with the 5-element Yagi I\nhave had for a long time, has been my uplink setup for AO-92's L/V\nconfiguration over the past couple of weekends. For satellite use, I\nthink it would be great as an uplink radio for the 3 bands, and might\nbe useful for full-duplex operation on the U/V satellites, but comes\nup way short with the only V/U FM satellite we currently have (SO-50).\nI don't have an antenna that would let me see if the DJ-G7T could work\nAO-92's L/V configuration full-duplex, but that would be interesting\nto see. I won't sell my DJ-G7T, and will continue to recommend the\nTH-D72 for anyone looking for an HT currently in production to work\nV/U and U/V FM satellites full-duplex. Otherwise, there are many HTs\nthat can work V/U and U/V FM satellites that have been out of\nproduction, or there is always the option of using two radios.\n\n73!\n\n\n\n\nPatrick WD9EWK/VA7EWK\nhttp://www.wd9ewk.net/\nTwitter: @WD9EWK or http://twitter.com/WD9EWK\n",
    "attachments": []
}