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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/4RBYFNJUHDO2CLR5IK2HQH2G7MT3LAGS/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "4RBYFNJUHDO2CLR5IK2HQH2G7MT3LAGS",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/4RBYFNJUHDO2CLR5IK2HQH2G7MT3LAGS/?format=api",
    "sender": {
        "address": "tjschuessler (a) verizon.net",
        "mailman_id": "e00b615eeb1940c790a22f139add6462",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/e00b615eeb1940c790a22f139add6462/emails/?format=api"
    },
    "sender_name": "[email protected]",
    "subject": "[AMSAT-BB] UHF preamps",
    "date": "2022-12-27T04:31:18Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "For my portable/temporary satellite antenna rig, I have need of using a UHF\npreamp, which I have strapped to the tripod that holds and aims my Arrow\nantenna.  I find that my FT847 is just not as sensitive on 70 CM as it is on\n2M.  I have been using an ARR (Advanced Receiver Research ) SP432VDG which\nis supposed to have a maximum power pass through imitation of 25watts.  I\ntry to be pretty careful as to how much output I run through the thing,\nmaybe limiting to 15 watts or so.  Unfortunately, I have blown the preamp\nout several times, even with being conscious of the RF level.  I sent the\npre to them, they repaired and sent back.  I recently discovered that I had\nblown my unit again.  Symptom is that it adds noise to the output, but does\nnot amplify any signals coming into it from the antenna.  I have sent the\nunit in to ARR in the past for repair.  This time I am contemplating\nreplacing this one with a more robust device that might be able to handle\nmore RF running through it (RF sensing means you will still hit the device\nwith an instantaneous burst of RF before the internal relays kick in.  \n\n \n\nA friend has confided that he has the higher power version of the ARR\nPreamps, but has had similar problems with killing the things.  Thus I am in\nthe market for maybe another option.  While I oft times, will stroll over to\nthe antenna tripod, and barrel off the cables going to and from the preamp\nto bypass completely from the transmit chain, this is kind of a pain, even\nin a portable situation.\n\n \n\nI looked at M2s web site and can find a 2 Meter amp, but no 70CM (Might be\nmissing something.  I have heard a lot of good things on the SSB preamps,\nbut the only pace I can see them being sold, is Dolstra in Europe.  Don't\nsee a US vendor.  \n\n \n\nLooking for suggestions.  I would be interested in buying pre-owned,  if\nsomeone had a Preamp that would like a new home.\n\n \n\nI do have a question for Yaesu FT847 users.  With that radio, you can power\na Preamp via the built in Bia- T power inserter, And assume that when this\nmode is turned on, it cuts the inserted DC to the preamp as the tranciever\ngoes into transmit.  Does this work fast enough to protect, even RF switched\npreamps?  That might be a good safety measure as I have traditionally used\nexternal DC to power my preamps.\n\n \n\nWisdom from the cloud here would be much appreciated.\n\n.\n\nTom Schuessler, N5HYP\n\n\n\n",
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