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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/5TM6ZF67OHUTUP7JAZYPFG5ZD5C4ATCJ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "CAN6TEUfYkWHZUJyJtd0dJBdDKBvk2WSstp1HtyC4hWWVkOVRGA@mail.gmail.com",
    "message_id_hash": "5TM6ZF67OHUTUP7JAZYPFG5ZD5C4ATCJ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/5TM6ZF67OHUTUP7JAZYPFG5ZD5C4ATCJ/?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-85 and Puxing PX-UV973,\tfull-duplex - report (not so long)",
    "date": "2015-11-27T17:23:20Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/NSZGL4V76HTWA7PEZS7A6QAHEOPGGE6V/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi!\n\nAnother day, another radio to try on AO-85. I woke up early, and decided to\ntry another HT on a high AO-85 pass starting at 1350 UTC. I wanted to see\nif it could work the satellite full-duplex. The radio, this morning: the\nPuxing PX-UV973. After working AO-85 with it this morning, my (low)\nexpectations were met.\n\nThe Puxing PX-UV973 has been on the market a couple of years. It is\nsupposed to handle cross-band full-duplex operation. This radio is still in\nproduction, and I picked mine up from Amazon for about US$ 78. It is less\nexpensive than the other radios I have tested so far for full-duplex\noperation on AO-85, and it shows.\n\nFirst, the simple question. Can the PX-UV973 work AO-85 full-duplex?\n\nYes, more or less.\n\nThe radio comes with a duckie antenna, and a 7.4V/1200mAh battery pack. The\nbattery pack is smaller than the standard packs supplied with the other HTs\nI have tested so far. It is also a little bit smaller than the other HTs.\nAs with the others, I did not program any memory channels to work AO-85. I\nused the two VFOs, putting the uplink into the upper (A) VFO, and the\ndownlink into the lower (B) VFO. Uplink and downlink can be done from\neither VFO.\n\nI used these VFO-specific settings with this radio, similar to what I have\nbeen using with the other HTs:\n\nUplink VFO:\n\nSQL (005): 9\nN/W (014): WIDE\nT-CDC? (019): 67.0\nSTEP ? (020): 2.50\n\nDownlink VFO:\n\nSQL (005): 0\nN/W (014): NARROW\nSTEP ? (020): 2.50\n\nAnother setting I had to enable for full-duplex operation was:\n\nDUPLEX (031): ON\n\nWith the smaller tuning steps, I could get the AO-85 downlink lined up\neasily on my PX-UV973. It was about 5 minutes into the pass before I made\nmy first QSO, with Glenn AA5PK in west Texas. A couple of minutes later, I\nmade another quick QSO with Ed N7EC north of the Phoenix area. The receive\naudio while I transmitted was not really good - despite the satellite's\nelevation heading up to 56 degrees at the midpoint of the pass. The HT was\nable to operate full-duplex, but the other HTs I have tested with AO-85\nhave done much better. I could still hear myself through AO-85 a couple of\nminutes after these QSOs, until the trees in a neighbor's yard started to\nmake it tougher to hear. The CW beacon from XW-2F was also starting to\noverlap with the AO-85 downlink, also.\n\nUsing my SDR receive setup (SDRplay receiver, HDSDR on an 8-inch Windows 10\ntablet, AMSAT-UK VHF crossed dipole), my transmitted audio sounded OK. Not\nloud, but it was fine - similar to what I've heard from the other Chinese-\nmade HTs I have tested. I have uploaded the audio recording I made from the\nHT, the RF recording from the SDR receive setup, and some photos, to my\nDropbox space. You can get those files at http://dropbox.wd9ewk.net/ - look\nfor the folder \"20151127-AO85_Fox1A_XW2F-DM43\". I also heard XW-2F near the\nend of the AO-85 pass, and I let HDSDR continue writing the RF recording to\ncover XW-2F until its LOS.\n\nSince the PX-UV973 has been on the market for a couple of years, I did not\nhave high expectations for it working AO-85 full-duplex. I was not\nsurprised to see that it was a poor performer. If I had to rank this with\nthe other 3 Chinese-made HTs I previously tested, this one would be at the\nbottom of the list by default:\n\n1. Wouxun KG-UV9D\n2. AnyTone TERMN-8R\n3. Wouxun KG-UV8D\n4. Puxing PX-UV973\n\nDon't be drawn in by the low price of the PX-UV973. If you already have it,\nit can be used as one radio of a two-radio setup, probably as the uplink\nradio. Or use it for terrestrial repeaters, where it would probably serve\nthat purpose adequately. I now understand why one dealer was hesitant to\noffer an opinion about this radio's performance for FM satellite work, when\nI asked about it early last year.\n\n73!\n\n\n\n\n\nPatrick WD9EWK/VA7EWK\nhttp://www.wd9ewk.net/\nTwitter: @WD9EWK\n",
    "attachments": []
}