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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2ZV4VB74GKGGT5SQXGOR4CUJCJITM3GQ/",
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    "message_id": "CAGjZ1-rQx4a3ZHj5whG2sSFkLNEDKP9mrtMuiSYKcx_030Sg6w@mail.gmail.com",
    "message_id_hash": "2ZV4VB74GKGGT5SQXGOR4CUJCJITM3GQ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/2ZV4VB74GKGGT5SQXGOR4CUJCJITM3GQ/",
    "sender": {
        "address": "dsolberg8132 (a) gmail.com",
        "mailman_id": "25e83196949d4f1588a321976f0ea13e",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/25e83196949d4f1588a321976f0ea13e/emails/"
    },
    "sender_name": "Don Solberg",
    "subject": "[AMSAT-BB] Re: UHF preamps",
    "date": "2022-12-27T13:50:01Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Another really good preamp is made by SSB Electronics and sold by HRO\nhttps://www.hamradio.com/detail.cfm?pid=H0-016832\n\nI have used this one for well over a year.\n\n73,\n\nDon K9AQ\n\nOn Tue, Dec 27, 2022 at 4:28 AM J. Hunt via AMSAT-BB <[email protected]>\nwrote:\n\n>\n> Hi Tom,\n>\n> Beko Elektronik, represented by Island Amplifiers has your answer(s) with\n> a complete remote 440mhz preamp with internal T/R by-pass relay.\n>     https://islandamplifier.com/\n>\n>    https://www.beko-elektronik.de\n>\n>\n> Another source is Down East Microwave\n>          https://www.downeastmicrowave.com/\n>\n> Best of knowledge, neither had a 1296 (23cm) complete remote pre-amp with\n> internal T/R by-pass relay.\n> With my engineering background, I made a 600 watt model.  Works great on\n> the weak signal / tropo scatter.\n>\n> Thanks n 73,\n> James\n> KI5DQ\n> On Monday, December 26, 2022 at 11:04:54 PM CST, Zach Metzinger via\n> AMSAT-BB <[email protected]> wrote:\n>\n>\n> On 12/26/22 22:31, tjschuessler--- via AMSAT-BB wrote:\n>\n> > I do have a question for Yaesu FT847 users.  With that radio, you can\n> >  power a Preamp via the built in Bia- T power inserter, And assume\n> > that when this mode is turned on, it cuts the inserted DC to the\n> > preamp as the tranciever goes into transmit.  Does this work fast\n> > enough to protect, even RF switched preamps?  That might be a good\n> > safety measure as I have traditionally used external DC to power my\n> > preamps.\n>\n> I have a homebrew UHF LNA that initially suffered the same fate as yours\n> before it was modified with protective PIN diodes on the output.\n>\n> I am powering the relays which switch from \"inline\" (during RX) to\n> \"bypass\" (during TX) with the FT-847's bias-tee function. I found that\n> the relays might not be quite fast enough to avoid getting a significant\n> RF pulse back into the LNA output. This was most pronounced with CW,\n> while SSB was tolerated better -- probably because I waited a moment to\n> speak after pressing the PTT.\n>\n> In a previous posting, I wrote:\n>\n> > http://www.n0zgo.net/lna/70cm/max2640/70cm_lna_max2640_annotated.jpg\n> >\n> > (The BAR64 PIN diodes were added to protect the MAR3-SM+ output gain\n> > block when transmitting. Without those, the MAR3 was dead within a\n> > few minutes of use at >10W TX.)\n>\n> You might try putting some of those PIN diodes into your unit. It might\n> just keep it from going up in smoke.\n>\n> --- Zach\n> N0ZGO\n>\n> -----------------------------------------------------------\n>\n> Sent via AMSAT-BB(a)amsat.org. 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> Acceptable Use and Privacy Policies available at\n> https://www.amsat.org/about-amsat/\n>\n> View archives of this mailing list at\n> https://mailman.amsat.org/hyperkitty/list/[email protected]\n> To unsubscribe send an email to amsat-bb-leave(a)amsat.org\n> Manage all of your AMSAT-NA mailing list preferences at\n> https://mailman.amsat.org\n>\n> -----------------------------------------------------------\n>\n> Sent via AMSAT-BB(a)amsat.org. 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> Acceptable Use and Privacy Policies available at\n> https://www.amsat.org/about-amsat/\n>\n> View archives of this mailing list at\n> https://mailman.amsat.org/hyperkitty/list/[email protected]\n> To unsubscribe send an email to amsat-bb-leave(a)amsat.org\n> Manage all of your AMSAT-NA mailing list preferences at\n> https://mailman.amsat.org\n\n\n",
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