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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HBW66VMUZJ7CMZAQKI3B5EJ76LS5AKG7/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "HBW66VMUZJ7CMZAQKI3B5EJ76LS5AKG7",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/HBW66VMUZJ7CMZAQKI3B5EJ76LS5AKG7/",
    "sender": {
        "address": "bob (a) evoria.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Bob Stewart",
    "subject": "[amsat-bb] Re: Polarity Switcher Relay - repost",
    "date": "2007-09-05T18:36:54Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n--- Bruce Robertson <[email protected]> wrote:\n> Bob:\n> \n> An important factor you don't mention is the coax to your antennas. If you\n> are not using preamps, the losses of the cables decrease the noise figure\n> of your reception by the same ratio, and this can add up very quickly to an\n> unworkable situation. \n\nHi Bruce,\n\nSorry, about that.  I'm using wireman's #106 which is a low-loss foam\nRG-8 type with both braid and foil shielding.  Also, there's only about\n35 feet of it, so the loss should be be very low.\n\n> I think most of us also believe from experience that mast-mounted, low\n> noise preamps (from ARR or SSB USA) do far more for a station than polarity\n> switching. These are not inexpensive additions, but, especially  on 70cm,\n> they are indispensable. \n\nHere's what's happening.  From about 20 degrees up to about 30 or so, \nreception is iffy.  After that, I sometimes have full quieting and sometimes \nnothing.  I suppose I need to do a real study of it on one satellite, but \nit just seems that it should be a polarization issue.  I do have a spare\ncoax going up there, so I guess I could just make a LHCP version to \nbe sure.  Getting it out on the roof means that I have to make a much\nmore robust version.  I was hoping to put that off until I was completely\nsure that I've got a configuration that works properly.  It's much easier\nfor me to just move the antennas to the back yard when mowing season\nis over  (I'm disabled).  Fortunately, I have a semi-finished attic with easy \naccess.\n\nAnother thing I've been thinking of is that once I'm comfortable with\nmessing around with relays etc on 70cm I might be able to use a DEM\npreamp with my own switcher.  Thus my question on the relay.\n\nBob - AE6RV\n",
    "attachments": []
}