SSB backstay antenna, a new way

Ben Ellison

Ben Ellison

Panbo editor, publisher & chief bottlewasher from 4/2005 until 8/2018, and now excited to have Ben Stein as very able publisher, webmaster, and editing colleague. Panbo is going to the next level in 2019 and beyond.

10 Responses

  1. Patrick says:

    Hmmm…. I’m not an atenna expert, but it seems like they are feed two wire parrellel to the backsty which means all three wires would be “hot” when transmittng so you’d have a random length longwire and you’d need some antenna tuner gear to deal with that I’m assuming. I’ve not looked in the backstay antenna lengths, but I always assumed (again with that word) they were sized to be tuned for the most appropriate frequency. Also it seems like it would expose anyone in the cockpit to more RF closer to their heads than the normal setup. Anyway, this sounds great from a rigging perspective but not so good on its face from a RF perspective. I’m curious what others think though because I’m a very rusty ham.

  2. Ben Ellison Ben Ellison says:

    Interesting, Patrick, but my BS meter goes into the red zone when I read aggressive bluster like, “This split lead antenna is a scam. It won’t perform worth a damn and is outrageously expensive” from a dude whose idea of good antenna is scrap wire hanging from a spare halliard. Might work ok for a delivery captain, but is that a rig you want to sail around with long term? Apple and orange comparison from an internet troll, I suspect.

  3. Silverheels III says:

    IMHO there will be quite a lot more stray RF zinging around the cockpit with this antenna solution than with an inslated backstay. The dual parallel wires simply couple the RF into the wire backstay. The resulting non-resonant antenna element will be comprised of the backstay, both antenna wires, the stern rigging tang, ground plane, the mast and effectively the whole rig…shrouds and all. With an insulated backstay, the 23 ft section that is between the insulators, together with the single conductor high-voltage feedline from the antenna tuner, is chosen to be harmonically related to the majority of the SSB channels desired. Extra metal hanging off the ends of the antenna….the mast, shrouds etc will all be directly RF driven from the tuner. There is enough parasitic RF current zinging around under an end-fed random length SSB antenna without actually connecting the antenna directly to the sailboat’s rigging! I’ll hoist a 23 ft wire on a halyard while saving for a pair of quality insulators.

  4. vronp says:

    It’s better to build a couple of stainless steel vertical dipoles than to pursue ANY kind of insulated backstay arrangement. You’ll get much better performance.

  5. Bob says:

    I noticed that this design runs braided copper thru HDPE. If for a backstay(or double backstay) you were to use amsteel(which is a hollow braid), some other suitable HDPE or UHDPE and run a wire for an antenna thru it. Let’s also say where the wire stopped and started you kinda pushed the HDPE together like a Chinese finger handcuffs and worked in some insulating goop(please suggest what you think best), with the rubbery characteristics of boatlife,waited until it slightly cured and then stretched it(loaded it till full cure). Wouldn’t that work. It seems that type of line is also being used on it’s terminal ends with a loop and lashing. Couldn’t the loop(eye) go around a ceramic insulator, and then lashed, like the kind you sometimes see where telephone guy wires attach near the ground. Also if the insulating idea worked what would the effects be of the slight salty moisture, surrounding the antenna to a slight depth, what would the effect be on the signal? Also there is the benfit that it is more insulated if the antenna was touched.

    • Allen-Paul Templet KE7PGD says:

      I believe that sea water/salt saturation and low resistance to the uninsulated backstay would work against this (Amsteel line) approach…

  6. Doug says:

    Efficiency looks best in copper….
    Material Resistance
    (ohm-cmil/ft) (ohm-cm)
    Aluminum 15.94 2.650 e-6
    Brass 42.1 7.0 e-6
    Carbon (amorphous) 3.8-4.1 e-6
    Constantan 272.97 45.38 e-6
    Copper 10.09 1.678 e-6
    Iron 57.81 9.61 e-6
    Manganin 290 48.21 e-6
    Molybdenum 32.12 5.34 e-6
    Nichrome 675 112.2 e-6
    Nichrome V 650 108.1 e-6
    Nickel 41.69 6.93 e-6
    Platinum 63.16 10.5 e-6
    Stainless steel (304) 541 90 e-6
    Steel (0.5% Carbon) 100 16.62 e-6
    Tungsten 31.76 5.28 e-6
    Zinc 35.49 5.90 e-6

  7. Jeff Stennett says:

    When I was first getting into sailing, and Marine HAM SSB about 15 years ago, I consulted a couple of sailing RF engineer coworkers of mine at Northrop about HF antennas on our sailboats. They said their experiments with multiple designs, as well as the traditional backstay SSB antenna, showed so much parasitic induction and radiation throughout the rigging, push and pullpit, mast, etc….that there really was no predictable radiation pattern, and concluded the random (or cut-to-length, tuned) wire raised on a halyard, and fed through something like an LDG AT-200 II Pro was at least as good, and spared you the risk and expense of cutting that backstay and installing insulators.

    Considering that, I’d say the sky’s the limit, literally. I’ve always been intrigued by the idea of a surplus weather balloon off eBay, filled with helium, lifting as much 16 or 18gauge marine wire as possible, as a big vertical….hoisting the coax feedline by halyard to the top of the mast. I’ll bet that would be fun !

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