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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/UQNV3A6ISHWTQ65H2AC2PUORX7JEUQXQ/",
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    "message_id": "[email protected]",
    "message_id_hash": "UQNV3A6ISHWTQ65H2AC2PUORX7JEUQXQ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/UQNV3A6ISHWTQ65H2AC2PUORX7JEUQXQ/",
    "sender": {
        "address": "w7lb (a) earthlink.net",
        "mailman_id": "01fab9843c3545d4afce781b83a77154",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/01fab9843c3545d4afce781b83a77154/emails/"
    },
    "sender_name": "Larry Brown",
    "subject": "[eagle]  Eagle S-Band & L-Band decisions",
    "date": "2006-09-10T08:57:12Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CVB5AYUGKA7H7ZOKX7Y5S3PTZSAPXWIN/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
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    "content": "I have been following this discussion for a number of months now both on the\nEagle discussion group and on AMSAT-bb.   I don't want to add to the noise\non amsat-bb but do have an opinion. I want to hear the satellite as well as\npossible so if that means abandoning 2.4 Ghz as a downlink, I can live with\nthe decision.  I am not happy with the prospect but I realize that you can't\nfight physics.  I do plan to borrow a spectrum analyzer and examine how bad\nthe situation is around my house in Tucson.    Before we lost the L1\ntransmitter and the dish antenna on AO-40 I was hearing the bird very well\nwith a minimal antenna and poor noise figure down-converter.  The AO-40\nS-band downlink took a huge hit when all we had was the S2 transmitter and\nthe helix antenna.  I have spent the best part of 15 years selling S-band as\nthe satellite downlink of choice to satellite users so it is very hard to\nnow have to start selling another answer, but so be it. \n\n \n\nMy BIG concern is giving up the L-band uplink without a fight based on the\nassumption that at some time in the future we may lose the band due to a\nsystem that has not even been fielded yet.   While the Galileo system will\nprobably be fielded, let's not give them the benefit of the doubt.   Even if\nit is fielded we do not automatically lose the allocation.  It looks to me\nlike our potential for interference is relatively minor compared to the real\nissues that they face on the E5 links in the radiolocation band where there\nare aircraft transponders, DME transponders, DME interrogation links,\nLink-16 Data Links and numerous other radio navigation emitters and radars.\nI personally don't think that they will even notice us.  I have seen one or\ntwo places where they are selling the Safety of Life services as being jam\nresistant and these capabilities are spread out among all of the downlinks.\n\n\n \n\nSince L-band only involves a receiver on the satellite and antenna space\nthat could also be shared with other receivers if necessary (with well\ndesigned stacked patch antennas or feeds), I think that an L-band receiver\nshould be flown (unless we lose the allocation prior to launch).  In making\nthis statement I am assuming that the cost of adding an L-band uplink is not\nexcessive.   I think we should plan on using the band and then turn off the\nreceiver if we lose the allocation.  It is part of our responsibility to use\nand defend our bands to the best of our ability and the L-band uplink is\nvery valuable to us.  Many of us have existing equipment and are L-band\nterrestrial or EME users and we need L-band on the satellite to help defend\nour rights to the band.   Have a back-up or alternate uplink in case we do\nlose L-band at but plan to fly and use it as long as possible.   We can\ninform our members that the band is at risk and then it is their choice if\nthey invest in new L-band equipment.  We should make it be the government\n(not AMSAT) that takes away our access to this band.  \n\n \n\nThere are my thoughts.  I will happily adapt to whatever decision that\nAMSAT's management and the Eagle design team make.  I am looking forward to\nseeing many of you at the TAPR/DCC conference next weekend.\n\n \n\nLarry Brown, W7LB  \n\n \n\n \n\n \n\n\n\n",
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