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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SHWMFBWPVVUAPXOYGOPFTTAL7ANUEELF/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "SHWMFBWPVVUAPXOYGOPFTTAL7ANUEELF",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/V3GSN472YGPAV4RNKPXPXXUKRPIIAOBJ/",
    "sender": {
        "address": "al7eb (a) acsalaska.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Edward R. Cole",
    "subject": "[amsat-bb] Re: Adding a Pre-amp to a standard tranciever",
    "date": "2007-02-04T00:31:57Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/V3GSN472YGPAV4RNKPXPXXUKRPIIAOBJ/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PLUM6IZMESIBU3ENSJB5XRA627IXQKFH/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "At 11:35 PM 2/3/2007 +0000, [email protected] wrote:\n>\n>I am considering my next station upgrade to be mast mounted preamp(s). I\nprefer the NON R.F. switching type due to their general better\nperformance/cost and leaving me the ability to run QRO is need be in the\nfuture. \n>My only experience is using a preamp with a transverter where there are\nseperate RX and TX lines. Now I do fully understand that you cannot TX\nthrew these devices. My radio DOES have the ability to send DC voltage\nthrew the coax while recieving ( IC 820H ). Even tho the radio can do this,\nI just dont understand how it works or if I would still need to use a\nsequencer. And even at all that... how an ARR preamp ( example ) can pass\nany sort of RF. The only way I can see how it would work is if some sort of\nswitch is inplace @ the antennas as well, the DC from the radio or\nsequencer switches the preamp IN place when RX'ing and OUT of place when\nTX'ing. \n>Now if this is indeed the case.. and im going to assume it is.. where\nwould I begin to look for a Coaxial Relay that can pass 1kw @ 432 / 144\nmhz? Now I know your thinking HU? 1KW!!! This is not my intended power\nlevel for the sats.. dont worry.. its for ( in the future ) possibly trying\nsome single or dual yagi EME. \n>\n>-Steve Raas\n>N2JDQ\n>FN20vg\n\nSteve,\n\nI'm not sure if the above is directed to answer what I wrote you.  I made\nno comments about transmitting on the coax line leading to the preamp (NOT\nsomething you want to do).  MY comments had to do with sending DC voltage\nup the coax to power the preamp.\n\nSince your IC-820H has the capability for sending dc power up to the\npreamp, you only need a way to separate out the voltage at the preamp.\nThis is typically done with a coupling capacitor in line with the center\nconductor and an RF choke taking dc off the center conductor to the power\ninput lead.(internally).  Commercially they are called Bias-T's.  This does\nnot require a sequener.  If you plan to transmit on the same cable, then\none should think about getting a sequencer, coax T/R relay, and separating\nyour Tx and Rx lines.\n\nARR makes an automatic switching preamp that allows one to transmit on the\nsame line.  They detect RF power and do the switching internally.  They\nalso power the preamp thru the coax line.  BUT NOT ALL ARR preamps have\nthis ability.  You can go to the advanced receiver website and determine if\nyou have that model.\n\nHope this clears up everything.\n\nEd\n\n73's,\nEd - KL7UW  \n=========================================\nhttp://www.qsl.net/al7eb - BP40iq \n144-EME: FT-847, mgf-1801, 4xM2-xpol-20, 185w (QRV)\n432-EME: Not QRV\nUSA Rep. for Dubus Magazine: [email protected]\n=========================================\n\n",
    "attachments": []
}