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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/N4FZZG7NQVAJO7QTPHTX2JEHIVBSZE3H/?format=api",
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    "message_id": "286413405.39145.1399042712705.JavaMail.vpopmail@webmail.networksolutionsemail.com",
    "message_id_hash": "N4FZZG7NQVAJO7QTPHTX2JEHIVBSZE3H",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/N4FZZG7NQVAJO7QTPHTX2JEHIVBSZE3H/?format=api",
    "sender": {
        "address": "pat (a) patkilroy.com",
        "mailman_id": "05cbf13cd71a4606b24ad8d3c3d6a996",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/05cbf13cd71a4606b24ad8d3c3d6a996/emails/?format=api"
    },
    "sender_name": "Pat Kilroy",
    "subject": "[amsat-dc]  Re: Gulf Alpha Antennas Vs. the Competition > Cheap",
    "date": "2014-05-02T14:58:32Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RZEIKQ357ILSH26D4VW2XNSYQYIS6LW2/?format=api"
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    "content": "Dear Paul and Steve,\n\nThank you!  Your comments were highly valuable to me!\n\nI am looking to improve my portable ground station and,\nat the same time, see if I can help others with theirs\ntoo.   A goal is to help elevate hand-held Arrow users\nup to the  next levels of performance, to picnic table\nportable.\n\nAnd perhaps with Az-El mounting capability, either\nmotorized  manual or  automated.\n\nDavid W2LNX was working on a nice Az-El \"Cheap- Rotator\"\nassembly, so I was thinking of a summer of 2014  project,\nbuilding and seeing if the C P \"Cheap-Yagi\" as  you\nmention could be improved upon.  Wouldn't it be  nice\nto hold next year's AMSAT-DC workshop on  assembling\nsomething like an improved cheap CP UHF yagi!\n\nFYI, here are some other reviews I just found:\n\nGulf Alpha Reviews\nhttp://gulfalphaantennas.com/S%20TAKES.pdf\nhttp://www.amsat.org/amsat/archive/amsat-bb/200812/msg00551.html\nhttp://www.k4lrg.org/Projects/432_MHz_Yagi_Prototype/\nhttp://www.w5pfg.us/2013/01/gulf-alpha-circular-polarized-vhf-5x5.html\nhttp://www.eham.net/ehamforum/smf/index.php/topic,65620.0.html (two\npages)\nhttp://forums.qrz.com/archive/index.php/t-265979.html\nhttp://www.dxzone.com/dx22904/gulf-alpha-communication-antennas.html\n\nThanks again!\n\nCheers,\n\nPat\nN8PK\n\nOn May 1, 2014 at 9:35 PM Stephan Greene <[email protected]> wrote:\n\n>  Pat:\n> \n>  I think rotating for polarity matching is more important on the\n> downlink.  On uplink, more TX power may be simpler/easier as needed.\n>  I've wanted a bit more gain than what I get from the 4 or 6 element\n> linear-polarized yagi on 2M.   I keep thinking about building a CP\n> cheap-yagi.\n> \n>  The issue with a CP antenna is transport.  You might be able to get\n> same effect with 2 linear antennas and appropriate phasing lines and\n> mechanical offset - a lot of the early AO10 and 13 ops went that way.\n> \n>  We had M2 antennas at the AO27 ground station.  They are very rugged,\n> well made.  However, the assembly method uses insulating plugs and\n> push-nuts (so does my old Hy Gain sat array); they are a PITA to\n> assemble and not meant for disassembly other than separating at boom\n> joints.  The 70cm antenna is rugged enough (and much smaller) for\n> transport in sections, the longer 2M elements are succeptible to\n> damage in a CP config.  An option for 70cm is to use the bottom half\n> of a longer boom CP antenna; I have been doing this with reasonable\n> success on my home station.\n> \n>  No experience with GA, so can't help there.\n> \n>  FYI, Directive Systems changed owners approx a year or so ago and is\n> now in Virginia.  They were at Vienna and I expect they will be at\n> Manassas and Berryville.  A pair of 4 or 6 element 2M antennas (maybe\n> their rover special) with phasing lines might make a good CP array.\n> May be worth a call to them.\n> \n>  73\n>  Steve KS1G\n> \n> \n>  On Thu, May 1, 2014 at 6:15 PM, Paul Stoetzer <[email protected]\n> <mailto:[email protected]> > wrote:\n>    > > Pat,\n> > \n> >    I have only used linear antennas and I can say that I need to\n> >    constantly make adjustments to my polarity for the best signal. I\n> >    think I would find it very difficult to operate using a linear\n> > yagi on\n> >    a tripod unless I had enough gain to overcome the polarization\n> > fades.\n> > \n> >    73,\n> > \n> >    Paul, N8HM\n> > \n> >    On Thu, May 1, 2014 at 5:13 PM, Pat Kilroy < [email protected]\n> > <mailto:[email protected]> > wrote:\n> >    > Hi!  Can anyone give me a recommendation for\n> >    > the RHCP antenna  types for satellite work by\n> >    > the  (new?) Gulf Alpha outfit?\n> >    >\n> >    > http://www.GulfAlphaAntennas.com/\n> >    > <http://www.GulfAlphaAntennas.com/>\n> >    >\n> >    > In particular, do you have first hand experience\n> >    > with the Gulf Alpha portable 2m 3x3 element RHCP\n> >    > on the 4ft boom and the 70cm 5x5 element RHCP on\n> >    > the 3ft boom?  Or do you know someone who does?\n> >    >\n> >    > If I am so lucky, I would also appreciate if\n> >    > there are any comparisons of these types to\n> >    > the two \"extremes\" of competitors: M2 436CP30\n> >    > on the one hand and Arrow II (or the new\n> >    > Alaskan Arrow) antennas on the other.\n> >    >\n> >    > http://m2inc.com/index.php?ax=amateur&pg=106\n> >    > <http://m2inc.com/index.php?ax=amateur&pg=106>\n> >    > http://arrowantennas.com/arrowii/146-437.html\n> >    > <http://arrowantennas.com/arrowii/146-437.html>\n> >    >\n> >    > In my application of interest, I know the 436CP30\n> >    > is considered overkill because I  am concerned about\n> >    > portable or semi-portable ground stations at the\n> >    > moment, but features  such as construction technique\n> >    > and  durability can be related among these units.\n> >    >\n> >    > As an aside, for those of you who use linear Yagi\n> >    > antennas for portable satellite work, how important\n> >    > is it for you to rotate the sense (polarization) of\n> >    > your antennas, vertical through horizontal, during\n> >    > a given contact?  Not worth the bother?  Or do you\n> >    > think \"next time I'm gonna build in a way to rotate\n> >    > the plane of my uplink/downlink antenna\"???\n> >    >\n> >    > Thoughts?\n> >    >\n> >    > Thank you very much,\n> >    >\n> >    > Pat Kilroy\n> >    > N8PK\n> >    >\n> >    > _______________________________________________\n> >    > \n> >     <http://amsat.org/mailman/listinfo/amsat-dc>\n> >  > \n",
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