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For Sale HF Loop Antenna 1500W (K8NDS Style)

Discussion in 'Ham Radio Gear For Sale' started by W9QT, Jan 22, 2019.

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  1. W9QT

    W9QT Ham Member QRZ Page

    For sale is a 1500W fractional wave loop antenna, remotely tunable from 17 meters to 60 meters. It was constructed in Sep ’17 as a one-off project, but it has been stored indoors and has seen little use. Despite it being a great project, I have been operating HF primarily from my mobile and do not have a continuing need for it. It is based on designs by K8NDS (no endorsement implied). He claims that the design can handle up to 1500 W; it also uses 50% thicker copper than he specifies. Attached are in-process and assembled unit photos. SWR readings are provided across the tunable bands.

    I am asking $1500 PayPal, cash, or certified check. Due to its large and delicate nature I will require local pickup in Madison, WI or nearby (within ~150mi). Includes antenna, cover, stand, control box, and control wire.

    If interested, please post here and also email me at max [dot] [my last name] @ gmail.com.

    Construction details are as follow:
    • 2” Sch 40 PVC on the loop, 1 1/2" center strut, 1" feedline support
    • ~40” loop diameter
    • 10-500pF 10kV VVC (Bulgaria)
    • 3.0” x 0.012” Cu strap
    • Fixed gamma match
    • PL-259 RF input
    • Simple toggle switch control box, 12V input
    • Brushed DC motor
    • Custom modeled and printed brackets and shaft coupling. Autodesk Fusion 360 designs provided to buyer upon request.
    • Painted flat brown, with stand and shade for VVC/motor
    SWR (band center):
    • 1.26 @ 17m
    • 1.77 @ 20m*
    • 1.89 @ 30m*
    • 1.84 @ 40m*
    • 1.27 @ 60m
    * Likely lower than listed here. Measured with structures nearby.

    73,
    Max W9QT

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    Last edited: Jan 22, 2019
    W2QA, KC8YXA and KE9OL like this.
  2. W9QT

    W9QT Ham Member QRZ Page

    Reduced - now $975
     
  3. QRZ
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