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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RUCHIN6FYNHZBZ377F2OYIVBV6P3Y4DG/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "RUCHIN6FYNHZBZ377F2OYIVBV6P3Y4DG",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/Q5ELUGPORQW5DIL27Q3AOA6TA3MFHL2L/",
    "sender": {
        "address": "JamesDuffey (a) comcast.net",
        "mailman_id": "16d2718d7d4a47dca8f564d867aacfe2",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/16d2718d7d4a47dca8f564d867aacfe2/emails/"
    },
    "sender_name": "James Duffey",
    "subject": "Re: [amsat-bb] Why too much uplink power is bad/eggbeater antennas\ton\txmit",
    "date": "2015-08-03T14:06:46Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/72RBYH2CVOI4MMXNQT2BNB57WLYK5YMS/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "I wonder what kind of feed line he issuing. RG8X or smaller can really eat the power up.\n\nOn Aug 3, 2015, at 7:17 AM, David <[email protected]> wrote:\n\n> Philip,\n> \tI use M2 EggBeaters, both have preamps for receive... I use no more\n> than 10 watts and am heard fine, if and only if the sat is on a low pass\n> (i.e. less than 15 degrees above horizon) I may use 15 to 20 watts to be\n> heard..  50 watts is way too much power and indicates another problem if\n> they cannot be heard..\n> \n> My 2 cents\n> \n> David\n> KK4QOE\n> \n> -----Original Message-----\n> From: AMSAT-BB [mailto:[email protected]] On Behalf Of Philip\n> Jenkins\n> Sent: Sunday, August 02, 2015 7:54 PM\n> To: [email protected]\n> Subject: [amsat-bb] Why too much uplink power is bad/eggbeater antennas on\n> xmit\n> \n> The discussion on uplink power fits right in with a conversation I had last\n> weekend...\n> \n> While I was not wearing my AMSAT badge at a hamfest on July 25, a married\n> couple - both hams, both fairly recently licensed - recognized me from a\n> previous hamfest when I was wearing that badge. Their question for me was to\n> why they could hear  (a) satellite(s), but no one could hear them...\n> \n> The satellite in question is SO-50 (and I did take a few minutes explaining\n> the difference between linear birds and FM-only ones).\n> \n> Before the OM joined us, his YL told me that her husband doesn't want to use\n> antennas like the Elk or Arrow, even on a tripod. I then suggested to her\n> that he consider a fixed elevation mount, so as to only have to track the\n> azimuth.\n> \n> Then the OM showed up. He doesn't even want to consider the fixed-elevation,\n> because he'd still have to track . I suggested he leave the tracking to a\n> computer...still not acceptable\n> \n> He then explained that they spend a lot of time in a motorhome. For his\n> antennas now, he is using eggbeaters. On the 440 receive side, he is\n> thankfully using a pre-amp, so he can hear adequately,\n> \n> For the transmit, he is using 50 watts into an eggbeater, and still can't be\n> heard on the satellite. He told me one recommendation he was given was to\n> increase the xmit power to 150 watts (*I visibly shuddered*) so as to\n> overcome the non-directionality of the eggbeater. (And I explained why too\n> much uplink power is bad for both FM and linear sats, in terms of bandwidth\n> and power consumption on the satellite.)\n> \n> On further questioning, he knew about the PL tone to turn-on SO-50, but\n> didn't know about the different PL to actually access the satellite on each\n> transmission. I explained to him that it is like terrestrial repeaters; no\n> matter how much power you run, the repeater won't \"hear\" you unless you\n> transmit the PL every time.\n> \n> In a follow-up email the next day, I passed on the SO-50 operating guide\n> (PDF) from the AMSAT website, and advised him to try programming his radio\n> with the proper PL and frequencies for adjacent memories BEFORE consdering\n> increasing transmit power.\n> \n> I really think his problem is not using PLs, rather than inadequate power\n> levels on an omni antenna.\n> \n> My question is two-fold (I still need to follow-up with him). 1) For those\n> of you successfully using eggbeaters for the uplink (and he is adamant about\n> not using a yagi, despite my advice that the performance will suffer quite a\n> bit with eggbeaters), what output power do you typically use? I think 50\n> watts into an eggbeater is probably still too much power, considering 5\n> watts into an Arrow is usually enough for successful communications.\n> \n> 2) I know that various power levels are suggested for various gain antennas,\n> but I'm wondering what the suggested EIRP is for successful - not ones which\n> would hog the satellite  - uplinks.\n> \n> Philip N4HF\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available to all\n> interested persons worldwide without requiring membership. Opinions\n> expressed are solely those of the author, and do not reflect the official\n> views of AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n> \n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions expressed\n> are solely those of the author, and do not reflect the official views of AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n\n",
    "attachments": []
}