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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CQFKAX5S2HYZOAQHIG4SJCFSCJUP7MBF/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "CQFKAX5S2HYZOAQHIG4SJCFSCJUP7MBF",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/CQFKAX5S2HYZOAQHIG4SJCFSCJUP7MBF/",
    "sender": {
        "address": "corner5 (a) comcast.net",
        "mailman_id": "9bef444d45f3431b9fa12f52098c7b6c",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/9bef444d45f3431b9fa12f52098c7b6c/emails/"
    },
    "sender_name": "corner5",
    "subject": "[amsat-bb]  preamp relay question",
    "date": "2009-01-21T16:11:19Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "hi all,   January 21, 2009\n\nI am assembling my first satellite station and have a question about the \npreamp bypass relays.\n\nBackground:\n > The rig is the TS2000 and I want the flexibility to use the full RF \nrange for 2m (100w) and 70cm (50w).  No RF out amp at this time.  I \nrealize I may never need the upper RF power limits, but I wanted to \nbuild in the option from the start.\n > I have a modest antenna system with a pair of omni's each on their \nown coax feed.  Each will have its own mast mount preamp.\n > The rig is capable of inserting a sequencing Tx delay.\n > The preamp bypass relays I have on hand are: AXICOM D2n \n(V23105-A5003-A201), 12vdc coil.  I needed and found a relay with a low \ncoil current (13mA) to be within the rigs trigger abilities (20mA max).  \nSo far so good.\n\n >> The relays specs. state: \"switching and continuous current = 3A\" and \n\"maximum switching capacity = 60w, 125VA\".\n\nThe question(s):\nQ1... Does this stated 60w power limit for the contacts also imply a 60w \nlimit for the RF level I wish to run through it?  Again, the rig limits \nout at 50w on 70cm so this is not the issue, but it (the rig) can go to \n100w on 2m.  In other words, I am unclear how the power limits of the \ncontacts may or may not change as one goes from DC to 60Hz to 144 MHz to \n440 MHz?\n\nQ2... I have been reading about relays that are specifically designed to \nhandle RF, yet I see many operators that seem to use more \"generic\" \nrelays for this purpose.  What is the requirement here with respect to \nfrequency?  This station is not intended to go to GHz.\n\nIn conclusion:\n_Is the above sited relay suited for this purpose?_  Are there \nconstraints or design considerations?  If the answer is \"nope, wont \nwork\", then what (and who) offers a not very expensive solution?  I \nreally would like to stay under my rig's 20mA limit for the coil current \n(and therefore maintain the sequencing ability). \n\nAnd as a final comment, the general consensus seems to be to go with a \nhardwired relay system and avoid the RF switched types.  This last is \nwhy I am pursuing this path.\n\nthanks for the advice! ac0z, .paul\n",
    "attachments": []
}