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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/K42RSDSCVYA2ETW3TQPCAY5UMUUPVIH5/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "81693F4CE2C44D4797039C8965AFCE3B@w4hij1",
    "message_id_hash": "K42RSDSCVYA2ETW3TQPCAY5UMUUPVIH5",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/JFL6FWCRXB3XXIGXUB72H3DAD2KGMLNB/?format=api",
    "sender": {
        "address": "mat_62 (a) netcommander.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Michael Tondee",
    "subject": "[amsat-bb] Re: beginner question re: uplink power",
    "date": "2008-10-19T22:18:01Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JFL6FWCRXB3XXIGXUB72H3DAD2KGMLNB/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Paul,\nIf i remember correctly there was gent on this board awhile back that \nreported some issues with the RF switching of Ramsey preamps. I believe the \nproblem had something to do with the switching cutting in and out while \nusing SSB. I can't remember the exact issue. though. Still you may want to \ntake this into consideration when making the decision whether to go with \nhard switching or not.\n73,\nMichael,W4HIJ\n----- Original Message ----- \nFrom: \"corner5\" <[email protected]>\nTo: <[email protected]>; <[email protected]>\nSent: Sunday, October 19, 2008 4:22 PM\nSubject: [amsat-bb] Re: beginner question re: uplink power\n\n\n> Thanks for replys (Re: beginner question re: uplink power)\n>\n> In response to two points contained in replys from helpful others...\n>\n>> Ed - KL7UW:  I wonder if the Ramsey preamps allow for \"hard\" switching. \n>> That is\n> by separate control line that the radio PTT controls.  Then You have\n> no issue with RF power and would run the units with the RF sense\n> disabled.  I should state that \"many\" (dare I say most) experienced\n> VHFers that run high power (>100w) use hard-wired switching.  I know\n> of NO eme stations that use RF sense control lines.\n>\n> A: Ed, yes this is a good suggestion.  In fact these preamps are very \n> simple units.  No, they do not have any switching that would\n> allow for external PPT communication from the TS2000 (0-100w@2m, \n> 0-50w@70cm). That said, I certainly could add my own mast mount external \n> relay\n> to do the switching.  I also could simply install a DPDT or TPDT switch at \n> the shack end and manually do the switching.  This last\n> approach could lead to smoking the preamp the one time I forget to toggle \n> it out of line.  So, in the end I chose to\n> go with the RF sense remote switch.  I hope the need to contain my uplink \n> RF withing a chosen range (0-10 or\n> 10-30 or 30-100 watts) will not be too limiting.\n>\n>> Roger,WA1KAT:  Hard wiring, as has been suggested, is your safest choice. \n>> As the switch has\n> the relay in it, maybe Ramsey can tell you where to tap in to directly\n> switch the sensor.\n>\n> A: This is a very interesting approach.  If I understand your idea here, \n> you suggest to use the relay that is\n> on the RF switch board and toggle this relay with a PPT signal from the \n> TS2000 (and not make use of the RF sense at all. Yes?\n> I do not know about the details of using the PPT signal in this way. I \n> guess I need to hope that the PPT signal\n> is compatible with the relay (voltage).  And then if I need to abandon the \n> RF switch all together, are there suggestions\n> as to what is a good (not too expensive) remote relay design?\n>\n> thanks all!\n> .paul  AC0z\n\n",
    "attachments": []
}