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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JI3YJCP7WPHYKFVWLARIXFB7BT6HDCQK/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "CABGf72oOK9wpbXum68r+vMHzmaLaKUfC4xcWfFD2mRLxFBHUDg@mail.gmail.com",
    "message_id_hash": "JI3YJCP7WPHYKFVWLARIXFB7BT6HDCQK",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/4AG2O7D7LVIC7V5BRQLR6AK7DVC4ITHU/?format=api",
    "sender": {
        "address": "tosca005 (a) umn.edu",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "John Toscano",
    "subject": "Re: [amsat-bb] Any experience with low-cost 433MHz transverter from\ttransverters-store?",
    "date": "2016-02-02T20:19:22Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WJ4DCKW7EMJTSHZ3RX5Y32RXUVHLB2FQ/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XNOJPU6FQ4NE3OTXRUKNUUYVGH7YMZEI/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "No, if you are using an Icom IC-706MkII as your IF radio, it cannot operate\nin full duplex mode. It CAN do split-band Tx/Rx, where you receive with the\nbuilt-in 2M section and transmit on 10 meters into the transverter to get\n70 cm output. Or you can receive on 10 meters which becomes 70cm through\nthe transverter, and transmit on the built-in 2M section of the radio. But\nyou can't hear while transmitting. You would need a second radio or a radio\nthat is designed for full-duplex operation.\n\nIf you could find a deal on another IC-706MkII and add the 70cm transverter\nto it, you'd then have a full-duplex station. A less expensive choice might\nbe an IC-703, which lacks the 2M band, but you only need 10M to run the\ntransverter anyway, so it would still make a nice matching pair of radios\nthat would work well for satellites. Or if you could find an IC-706MkIIg\nthen you'd have a nicely matching pair that includes 70cm on the new radio\nand you'd use 2M on the older radio. Kind of pricey, but it's just a couple\nof suggestions that could be made to work.\n\nAnother popular choice is a Yaesu FT-817. But then you would not need a\ntransverter since it has both 2M and 70cm bands already. You just might\nneed a PA to output more than 5 watts on mode UV, but no extra PA needed\nfor mode VU since the transmitter is the IC-706MkII in that mode.\n\nChoces, choices, choices...\nAnd we didn't even get into full-duplex radios like a Yaesu FT-847. (I love\nmine!)\n\nHappy shopping.\nJohn, W0JT/5\n\nOn Mon, Feb 1, 2016 at 11:06 PM, Eric Wolak <[email protected]> wrote:\n\n> Thanks, guys! It looks like the transverter kit includes an attenuator\n> board to interface with a radio, so I'm set on that. These transponders\n> work both ways, right, so if I can TX on 2m and RX on 70cm (through the\n> transverter), then I can hear my own transmissions full-duplex, and I\n> can make contact with someone TX'ing on 70cm?\n>\n> Are there any attributes that might be lacking with such a low-cost\n> option, e.g. frequency stability or harmonics?\n>\n> On Sun, Jan 31, 2016, at 03:12 PM, John Toscano wrote:\n> > The transverter itself can cover the satellite portion of the band.\n> > The specs say it covers 432 - 442 MHz. The issue is that your IF\n> > radio, the Icom IC-706MkII is what I believe you meant to say, can\n> > tune high enough on the 10M band and above for RECEPTION at the\n> > appropriate frequencies, but will not transmit above 30 MHz and\n> > therefore, through this transverter, will not transmit above 435.0000\n> > MHz. I know this from experience with my 222 MHz transverter.\n> > Fortunately, on that band, 28-30 MHz -> 222-224 MHz, and the portion\n> > of the band above that (224-225 MHz) is mostly FM repeater OUTPUTS,\n> > which the radio will happily receive through my transverter.\n> >\n> > What you would need to do is defeat the 10M band transmit limits on\n> > your IC-706MkII. You can probably find mods to allow that.\n> >\n> > Your other issue, which I also had to overcome with my 222\n> > transverter, is that the transverter needs (accepts) only a very low\n> > RF power signal on transmit (1-100 milliwatts) and your IC-706MkII is\n> > happy to transmit 1000 times as much power, up to 100 watts. So you\n> > will need to carefully interface the radio to the transverter to\n> > insure that the transmit power is nice and low. In my case, my\n> > transverter interface includes a source of negative voltage to feed\n> > into the ALC input of the radio, which can drop the power low enough.\n> > Interesting (=undesirable)  things happen if this ALC circuit fails,\n> > or more likely, gets accidentally disconnected. I was fortunate, when\n> > I transmitted 100 watts into my transverter by accident, I only fried\n> > a 50 ohm resistor in the input circuit, and after replacing it, all\n> > was good again, The same may or may not hold with this transverter.\n> >\n> > Good luck in your search for a solution.\n> >\n> > John Toscano, W0JT/5\n> >\n> > On Sun, Jan 31, 2016 at 12:46 PM, Eric Wolak <[email protected]> wrote:\n> >> Hi folks,\n> >>\n> >> I'm trying to get on the air with the linear transponder satellites,\n> >> and it looks like I need 70cm SSB capability to really get on the\n> >> air. My Icom IC-796MkII can do SSB on 2m, but not 70cm, so I'm trying\n> >> to find an affordable way to get 70cm SSB transmit.\n> >>\n> >> Does anybody have experience with these $100 transverter boards from\n> >> Ukraine? It looks like they're tuned for the weak-signal/SSB end of\n> >> the band and might require a bit of work to get up to 435MHz for\n> >> satellites. Is 3-4W enough to be heard?\n> >>\n> >> http://www.ebay.com/itm/221871269275\n> >> _______________________________________________\n> >> Sent via [email protected]. AMSAT-NA makes this open forum available\n> >> to all interested persons worldwide without requiring membership.\n> >> Opinions expressed are solely those of the author, and do not reflect\n> >> the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to\n> >> support the amateur satellite program! Subscription settings:\n> >> http://www.amsat.org/mailman/listinfo/amsat-bb\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions\n> expressed\n> are solely those of the author, and do not reflect the official views of\n> AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n>\n",
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