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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XNOJPU6FQ4NE3OTXRUKNUUYVGH7YMZEI/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "1454866678.2510706.514387450.4F017DF4@webmail.messagingengine.com",
    "message_id_hash": "XNOJPU6FQ4NE3OTXRUKNUUYVGH7YMZEI",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/4AG2O7D7LVIC7V5BRQLR6AK7DVC4ITHU/",
    "sender": {
        "address": "ag6ie (a) wolak.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Eric Wolak",
    "subject": "Re: [amsat-bb] Any experience with low-cost 433MHz transverter from transverters-store?",
    "date": "2016-02-07T17:37:58Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JI3YJCP7WPHYKFVWLARIXFB7BT6HDCQK/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Ahhh, right. I still only have one SSB modulator/demodulator, no matter\nhow I slice it. Back to the RTLSDR stick!\n\n\nOn Tue, Feb 2, 2016, at 12:19 PM, John Toscano wrote:\n> No, if you are using an Icom IC-706MkII as your IF radio, it cannot\n> operate in full duplex mode. It CAN do split-band Tx/Rx, where you\n> receive with the built-in 2M section and transmit on 10 meters into\n> the transverter to get 70 cm output. Or you can receive on 10 meters\n> which becomes 70cm through the transverter, and transmit on the built-\n> in 2M section of the radio. But you can't hear while transmitting. You\n> would need a second radio or a radio that is designed for full-duplex\n> operation.\n>\n> If you could find a deal on another IC-706MkII and add the 70cm\n> transverter to it, you'd then have a full-duplex station. A less\n> expensive choice might be an IC-703, which lacks the 2M band, but you\n> only need 10M to run the transverter anyway, so it would still make a\n> nice matching pair of radios that would work well for satellites. Or\n> if you could find an IC-706MkIIg then you'd have a nicely matching\n> pair that includes 70cm on the new radio and you'd use 2M on the older\n> radio. Kind of pricey, but it's just a couple of suggestions that\n> could be made to work.\n>\n> Another popular choice is a Yaesu FT-817. But then you would not\n> need a transverter since it has both 2M and 70cm bands already. You\n> just might need a PA to output more than 5 watts on mode UV, but no\n> extra PA needed for mode VU since the transmitter is the IC-706MkII\n> in that mode.\n>\n> Choces, choices, choices... And we didn't even get into full-duplex\n> radios like a Yaesu FT-847. (I love mine!)\n>\n> Happy shopping. John, W0JT/5\n>\n> On Mon, Feb 1, 2016 at 11:06 PM, Eric Wolak <[email protected]> wrote:\n>> Thanks, guys! It looks like the transverter kit includes an\n>> attenuator\n>>\nboard to interface with a radio, so I'm set on that. These transponders\n>>\nwork both ways, right, so if I can TX on 2m and RX on 70cm (through the\n>>\ntransverter), then I can hear my own transmissions full-duplex, and I\n>>\ncan make contact with someone TX'ing on 70cm?\n>>\n>>\nAre there any attributes that might be lacking with such a low-cost\n>>\noption, e.g. frequency stability or harmonics?\n>>\n>>\nOn Sun, Jan 31, 2016, at 03:12 PM, John Toscano wrote:\n>>\n> The transverter itself can cover the satellite portion of the band.\n>>\n> The specs say it covers 432 - 442 MHz. The issue is that your IF\n>>\n> radio, the Icom IC-706MkII is what I believe you meant to say, can\n>>\n> tune high enough on the 10M band and above for RECEPTION at the\n>>\n> appropriate frequencies, but will not transmit above 30 MHz and\n>>\n> therefore, through this transverter, will not transmit above 435.0000\n>>\n> MHz. I know this from experience with my 222 MHz transverter.\n>>\n> Fortunately, on that band, 28-30 MHz -> 222-224 MHz, and the portion\n>>\n> of the band above that (224-225 MHz) is mostly FM repeater OUTPUTS,\n>>\n> which the radio will happily receive through my transverter.\n>>\n>\n>>\n> What you would need to do is defeat the 10M band transmit limits on\n>>\n> your IC-706MkII. You can probably find mods to allow that.\n>>\n>\n>>\n> Your other issue, which I also had to overcome with my 222\n>>\n> transverter, is that the transverter needs (accepts) only a very low\n>>\n> RF power signal on transmit (1-100 milliwatts) and your IC-706MkII is\n>>\n> happy to transmit 1000 times as much power, up to 100 watts. So you\n>>\n> will need to carefully interface the radio to the transverter to\n>>\n> insure that the transmit power is nice and low. In my case, my\n>>\n> transverter interface includes a source of negative voltage to feed\n>>\n> into the ALC input of the radio, which can drop the power low enough.\n>>\n> Interesting (=undesirable)  things happen if this ALC circuit fails,\n>>\n> or more likely, gets accidentally disconnected. I was fortunate, when\n>>\n> I transmitted 100 watts into my transverter by accident, I only fried\n>>\n> a 50 ohm resistor in the input circuit, and after replacing it, all\n>>\n> was good again, The same may or may not hold with this transverter.\n>>\n>\n>>\n> Good luck in your search for a solution.\n>>\n>\n>>\n> John Toscano, W0JT/5\n>>\n>\n>>\n> On Sun, Jan 31, 2016 at 12:46 PM, Eric Wolak <[email protected]> wrote:\n>>\n>> Hi folks,\n>>\n>>\n>>\n>> I'm trying to get on the air with the linear transponder satellites,\n>>\n>> and it looks like I need 70cm SSB capability to really get on the\n>>\n>> air. My Icom IC-796MkII can do SSB on 2m, but not 70cm, so I'm trying\n>>\n>> to find an affordable way to get 70cm SSB transmit.\n>>\n>>\n>>\n>> Does anybody have experience with these $100 transverter boards from\n>>\n>> Ukraine? It looks like they're tuned for the weak-signal/SSB end of\n>>\n>> the band and might require a bit of work to get up to 435MHz for\n>>\n>> satellites. Is 3-4W enough to be heard?\n>>\n>>\n>>\n>> http://www.ebay.com/itm/221871269275\n>>\n>> _______________________________________________\n>>\n>> Sent via [email protected]. AMSAT-NA makes this open forum available\n>>\n>> to all interested persons worldwide without requiring membership.\n>>\n>> Opinions expressed are solely those of the author, and do not reflect\n>>\n>> the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to\n>>\n>> support the amateur satellite program! Subscription settings:\n>>\n>> http://www.amsat.org/mailman/listinfo/amsat-bb\n>>\n_______________________________________________\n>>\nSent via [email protected]. AMSAT-NA makes this open forum available\n>>\nto all interested persons worldwide without requiring membership.\nOpinions expressed\n>>\nare solely those of the author, and do not reflect the official views\nof AMSAT-NA.\n>>\nNot an AMSAT-NA member? Join now to support the amateur satellite\nprogram!\n>>\nSubscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n",
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