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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/GFIGXD6QQQEX6LVA7TGROFK24XR32OFV/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "GFIGXD6QQQEX6LVA7TGROFK24XR32OFV",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/GFIGXD6QQQEX6LVA7TGROFK24XR32OFV/?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": "Re: [amsat-bb] RS-44 VU noise from TX",
    "date": "2020-05-25T19:24:35Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "When I started setting up to the 145 up 435 down satellites, I experienced\nthis issue badly.  The best solution I found was to use two separate\nDiplexer to feed my Arrow on a tripod.  I ended up using a triplexer for the\n2 meter side and a diplexer for the 70CM side.  The dual filtering seems to\nclean up all the third harmonic crud.  Some folks recommend a 50 Ohm\nterminator for unused ports but I most of the time don't use one. I put my\npreamps on the inside of the diplexers as filters because the loss is small\non the diplexer and filtering before the preamp will go a long way.\nLimiting power is also a help.  Most of our linear birds are pretty\nsensitive so keeping our transmitters down to a very low transmit output is\nbest for the satellite\n\nNow the comment was relating to SDR devices for the RX side, depending on\nwhat you have, some of these have very poor RF shielding so that in itself\nis a real problem\n\nTom Schuessler, N5HYP\nEM12ms\n_______________\n\nMessage: \nDate: Sun, 24 May 2020 20:43:27 +0200 (CEST)\nFrom: mailto:[email protected]\nTo: Andy Brian <mailto:[email protected]>\nCc: amsat-bb <mailto:[email protected]>\nSubject: Re: [amsat-bb] RS-44 VU noise from TX\nMessage-ID:\n\t\n<mailto:[email protected]>\nContent-Type: text/plain; charset=utf-8\n\nHoi,\n\nInstead of putting a diplexer as filter( best is to use 1 per band), if you\nhave the possibilty to make stuff your own, just 'split' a diplexer by\nmaking an LPF (low pass filter) at the 2m antenne and a HPF ( high pass\nfilter) at the 70cm antenne. Or find some to buy (MINI CIRCUITS maybe?).\nThis way you have a filter at both antennas. Mostly a diplexer is used only\non one antenna, while the other diplexer port is closed with a small dummy\nload.\nKeep in mind the tx-pwr!\n\nBest 73's\n\nJerry,ON4CJQ\n\n\n\n",
    "attachments": []
}