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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/4CGZYKRAUZHRSCX7M72XI7DPD3UDASWQ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "CAN6TEUdCaDbEX6A6WTX088ib=8U_8RsMeswOi1hknKAREsOJtw@mail.gmail.com",
    "message_id_hash": "4CGZYKRAUZHRSCX7M72XI7DPD3UDASWQ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/4CGZYKRAUZHRSCX7M72XI7DPD3UDASWQ/?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] AO-92 L/V with an Alinco DJ-G7T full-duplex (long)",
    "date": "2019-03-05T23:23:06Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/552G3Z6ELLF2STNPGWBNMFS7GCQOPYAQ/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/Y4TQYU4ZVCMEK2S5OYTIKCHVIAU3NYI5/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi!\n\nI have written a bit about the Alinco DJ-G7T and using it on satellites on\nthis list over the years. I wrote about using it on AO-92 in both U/V and\nL/V modes last year:\n\nhttp://amsat.org/pipermail/amsat-bb/2018-February/066923.html\n\nUntil the past weekend, I had always worked AO-92 L/V with two radios -\ntransmitting on 1.2 GHz from the DJ-G7T, and receiving the 2m downlink\nwith my Kenwood TH-D74 (which can also record the downlink). I have used a\ncouple of different antennas, but have wondered if the DJ-G7T could work\nthe L/V mode full-duplex like it can work U/V (with some caveats) full-\nduplex. Now, I have tried this for myself, and will ask the question...\n\nCan the Alinco DJ-G7T work AO-92's L/V mode full-duplex? Yes.\n\nBefore the past week or so, I was aware of the triplexers offered by\nDiamond that included a 1.2 GHz port. Those are noticeably larger than the\ndiplexers from Diamond and other manufacturers, and a larger price tag as\nwell. I saw something online that mentioned the Diamond MX-37 diplexer,\nhaving one port for HF through 470 MHz, and the other port for 800-1300\nMHz. Physically, the MX-37 diplexer is similarly sized with other\ndiplexers, and it has two coax pigtails for those two ports - coax with an\nN connector for the 1.2 GHz port, and a PL-259 on the other pigtail for\nuse with the lower frequencies. The common port is an N socket. After I\nreceived this diplexer in the mail, I was ready to fit it into my portable\nAO-92 L/V station.\n\nI have been using a 10-element 1.2 GHz Yagi for AO-92 L/V in the past few\nweeks, and I tie that to the PVC handle of my Elk log periodic. I decided\nto tie the MX-37 diplexer to the PVC handle behind the antennas. This\nallowed me to connect the 1.2 GHz side of the diplexer directly to the coax\npigtail from the Yagi's driven element. I used a 3-foot/1m length of coax\nfrom the PL-259 connector on the other side of the diplexer to the Elk's\ncoax feedpoint. From the common port on the diplexer, I ran another\n3-foot/1m length of coax to the DJ-G7T.\n\nTo keep from causing audio feedback while transmitting, an earpiece or\nsomething like that needs to be plugged into the DJ-G7T. The DJ-G7T uses\na single 4-conductor 3.5mm jack for speaker/mics. To split out the speaker\njack so I can use an earpiece and an audio recorder, an adapter is needed.\nI use Alinco's EDS-10 adapter, which provides a 3.5mm speaker jack and a\n2.5mm microphone jack (don't need anything in the smaller jack for this).\nAlinco also has an EDS-14 adapter, which looks very similar to Yaesu's\nCT-91 adapter used with a few HTs (VX-6R and VX-7R, among others) - where\nthe two jacks are on short pigtails from the 3.5mm plug. The Yaesu CT-91\nadapter works fine with the DJ-G7T.\n\nThe DJ-G7T only allows transmitting from VFO A, the upper VFO on the HT's\ndisplay. I put the 1267 MHz uplink frequency in this VFO, along with\nencoding the 67.0 Hz CTCSS tone. I use 5 kHz tuning steps on this radio for\n1.2 GHz. I set the volume for this VFO to 0, and tightened the squelch to\nthe maximum. For the lower VFO (B), I put 145.880 MHz with the squelch left\nwide open, and adjusted the volume to a reasonable level using my earpiece.\n\nI used this setup for 3 passes over the weekend. The antennas were a little\nheavier with the diplexer on the handle, but I could still control them\nwith one hand. I held the DJ-G7T, along with the splitter and patch cable\nto my audio recorder. I could still adjust the knob for the transmit VFO,\nand made some contacts on those 3 passes. It was fun to be able to use just\none HT for AO-92 L/V.\n\nThere are some tradeoffs when going from a two-HT setup for AO-92 L/V to\njust the DJ-G7T. The 2m receiver isn't as good as with other HTs, certainly\nnot as good as the TH-D74 I have normally used when working L/V. I heard\nsome other signals mixing with the AO-92 downlink on parts of a couple of\npasses. Of course, the DJ-G7T does not come with a built-in recorder like\nthe TH-D74. There may have been a little less power going to the 1.2 GHz\nYagi, passing through the coax to the diplexer's common port and then out\nfrom the diplexer to the Yagi, but I still got through. During one of the\nL/V passes, I was still able to get through AO-92 transmitting at low power\nfrom the DJ-G7T (rated at 300mW for 1.2 GHz).\n\nI posted some pictures of this setup on the QRZ satellite forum, in a long-\nrunning thread \"Where's AO-92???\", starting at:\n\nhttps://forums.qrz.com/index.php?threads/wheres-ao\n-92.614536/page-34#post-4986044\n\nAudio from my recorder on the 3 passes I worked last weekend with this\nsetup is in the \"Satellite_Audio-2019\" folder in my Dropbox space:\n\nhttp://dropbox.wd9ewk.net/\n\nThe direct link for the pass I worked Saturday evening, where the recording\nstarted at 0537 UTC Sunday (3 March), is:\n\nhttps://www.dropbox\n.com/sh/v3byggtuqw33fkk/AAA_gyTts4RpjT3jZa8GJI5ha/Satellite_Audio-2019/20190303-0537UTC-AO92-DM43bl.mp3?\ndl=0\n\nAudio from the 1709 UTC pass Sunday morning is at:\n\nhttps://www.dropbox.com/sh/v3byggtuqw33fkk/AACeV6R0Bjh-RRPXTrNpblAca\n/Satellite_Audio-2019/20190303-1709UTC-AO92-DM43bl.mp3?dl=0\n\nand the late-morning pass at 1843 UTC Sunday:\n\nhttps://www.dropbox.com/sh/v3byggtuqw33fkk/AADmbAfFYtHARDfULAR\n_J5eSa/Satellite_Audio-2019/20190303-1843UTC-AO92-DM43bl.mp3?dl=0\n\nIt is nice to see that the DJ-G7T is capable of L/V full-duplex operation,\njust as it is capable of U/V full-duplex operation, in line with Alinco's\nadvertising for the radio - with some caveats. I can now alternate between\na one-radio setup and a two-radio setup for AO-92 L/V. More fun with\nradios... :-)\n\n73!\n\n\n\n\nPatrick WD9EWK/VA7EWK\nhttp://www.wd9ewk.net/\nTwitter: @WD9EWK or http://twitter.com/WD9EWK\n",
    "attachments": []
}