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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JA74KVEJE4RJYAOAGMZDPEYCPKMHNBGY/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "92B62CDCBD884C96BB7CBACB03443313@parents",
    "message_id_hash": "JA74KVEJE4RJYAOAGMZDPEYCPKMHNBGY",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/Q5ELUGPORQW5DIL27Q3AOA6TA3MFHL2L/?format=api",
    "sender": {
        "address": "ka3hsw (a) att.net",
        "mailman_id": "afface7d7e8049fda539552165bdde78",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/afface7d7e8049fda539552165bdde78/emails/?format=api"
    },
    "sender_name": "George Henry",
    "subject": "Re: [amsat-bb] Why too much uplink power is bad/eggbeater antennas\tonxmit",
    "date": "2015-08-03T04:10:40Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/Q5ELUGPORQW5DIL27Q3AOA6TA3MFHL2L/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "I sometimes use an eggbeater for the uplink, and do just fine at 25 watts.\n\nGeorge, KA3HSW\n\n\n----- Original Message ----- \nFrom: \"Philip Jenkins\" <[email protected]>\nTo: <[email protected]>\nSent: Sunday, August 02, 2015 6:53 PM\nSubject: [amsat-bb] Why too much uplink power is bad/eggbeater antennas \nonxmit\n\n\n> The discussion on uplink power fits right in with a conversation I had \n> 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\n> to 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 \n> 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\n> use antennas like the Elk or Arrow, even on a tripod. I then suggested to\n> her that he consider a fixed elevation mount, so as to only have to track\n> the azimuth.\n>\n> Then the OM showed up. He doesn't even want to consider the\n> fixed-elevation, because he'd still have to track . I suggested he leave\n> the tracking to a 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\n> be heard on the satellite. He told me one recommendation he was given was\n> to 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 \n> 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 \n> 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\n> about not using a yagi, despite my advice that the performance will suffer\n> quite a bit with eggbeaters), what output power do you typically use? I\n> think 50 watts into an eggbeater is probably still too much power,\n> considering 5 watts into an Arrow is usually enough for successful\n> communications.\n>\n> 2) I know that various power levels are suggested for various gain\n> antennas, but I'm wondering what the suggested EIRP is for successful - \n> not\n> ones which would hog the satellite  - uplinks.\n>\n> Philip N4HF\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions \n> expressed\n> are solely those of the author, and do not reflect the official views of \n> 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---\nThis email has been checked for viruses by Avast antivirus software.\nhttps://www.avast.com/antivirus\n\n",
    "attachments": []
}