ZeroFive 43GP 43' 10-80 Vertical

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by KV4ZL, Oct 3, 2014.

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  1. K8JD

    K8JD Ham Member QRZ Page

    The thing with those heavy duty 43 ft pipe antennas is they are expensive AND don't forget to add the cost of installing a remote autotuner at the base. Without that item the thing is a single bander for 60M.
    They are a real neat 60M quarterwave or a 20M 5/8 wave vertical and work well 40, 30 M with the added base tuner..The other, higher freq bands ? Sky Cloud warmer with no low angle sig for any DX.
     
  2. KD6RF

    KD6RF Premium Subscriber QRZ Page

    As said, an auto tuner at the base removes worries about excessive feedline losses due to high SWR.

    However, if one is careful about cable type (RG213 or LMR400 as a minimum), and keeps the feedline length under 50 or 60 feet or so, then cable losses aren't bad (on most, if not all, bands), and a less expensive tuner (homebrew?) can be used in the shack. Like here at KD6RF :)

    In addition to keeping the feedline losses down, one needs to fool around a bit with feedline length so that you present the tuner with an impedance that it can efficiently match on all bands of interest.

    An analyzer is quite useful if you want to go this route. Once you know the impedances on the various bands -
    - you can use http://www.ac6la.com/tldetails.html TLdetails app from AC6LA to determine feedline loss
    - you can use http://fermi.la.asu.edu/w9cf/tuner/tuner.html T-Match sim app from W9CF to tweak the cable length to get a "good" impedance for an efficient match with the tuner

    $50 in cable, $50 in wisely purchased T-Match caps and other parts, and you have a pretty nice reasonably efficient manual tuner system.
     
    Last edited: Oct 7, 2014
  3. KM1H

    KM1H Ham Member QRZ Page

    Never even listened to 60M. When they turn it into a real ham band I'll use it but not channelization
     
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