Email Detail

HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TFNSBBB3WL535CPYTP2ZUEWXVLOQ6MKH/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "720778933.871995.1368494468761.JavaMail.root@sz0209a.emeryville.ca.mail.comcast.net",
    "message_id_hash": "TFNSBBB3WL535CPYTP2ZUEWXVLOQ6MKH",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/HWEYW45UKFWM3PDQXLFSZHMVUJ7QSPUF/?format=api",
    "sender": {
        "address": "w7lrd (a) comcast.net",
        "mailman_id": "717aa2a241704c7497e9abd8c983f6b7",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/717aa2a241704c7497e9abd8c983f6b7/emails/?format=api"
    },
    "sender_name": "Bob- W7LRD",
    "subject": "[amsat-bb] Re: Helical Antenna on 70 cm",
    "date": "2013-05-14T01:21:08Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HWEYW45UKFWM3PDQXLFSZHMVUJ7QSPUF/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/NAM4EPJ57WKE4HMTB6JZKM46S63KUPYZ/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "the helix is a nice antenna...however...once wound for either RHCP or LHCP there's no going back. So switching from R to L or L to R is out of the question. Unless of course the chosen polarity is always compatible with the satellite in use. Unless you have L and a R helix and switch between them, that can get a \"little\" involved. Many times it is very convenient to be able to switch between L or R during a pass, at times it can make the contact happen. This is of course is easy with a L/R CP yagi. I have used a helix for L band (1.2ghz ) as well as feeds for a 2.4ghz dish. They are a fine antenna with a fair amount of bandwidth. For a 16+ turn helix I have used stainless steel \"U\" channel for the center support. If Clair, VE3NPC is listening, he's the resident helix guy. Just my opinion, your mileage may differ. \n73 Bob W7LRD \nSeattle \n\n----- Original Message -----\nFrom: \"Rolf Krogstad\" <[email protected]> \nTo: [email protected] \nSent: Monday, May 13, 2013 9:22:57 AM \nSubject: [amsat-bb] Helical Antenna on 70 cm \n\nI am new to satellites and new to the design requirements for UHF and am \nlooking for advice. \n\nI am looking to build a Helical antenna for the 70cm Band. I am \nconsidering the plans for such an antenna from the 2010 edition of the ARRL \nSatellite Handbook. The plans call for a 235 cm (7' 8\") long, 2.5 cm (1\") \ndiameter center support made of either a wooden dowel which has been \ntreated or a fiberglass tube. It also requires multiple 7.6 cm (3\") \nspacers for the helical element. \n\nMy question is would fiberglass rods made of \"Isophthlic Polyester Resin\" \nbe a good choice of material at UHF frequencies? \nI hesitate to use treated wood because I plan to mount this on the top of a \n15 meter high tower and it isn't very accessible. \n\nThanks \n\nRolf NR0T \n[EN34] \n_______________________________________________ \nSent via [email protected]. Opinions expressed are those of the author. \nNot an AMSAT-NA member? Join now to support the amateur satellite program! \nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb \n",
    "attachments": []
}