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Collection: OCF Masters


A division of QC Avionix, LLC.

Conventional Off-Center Fed antennas start with the goal of making the antenna work well on the lowest frequency band placing the harmonic resonances high or outside the upper bands usually requiring an antenna tuner on some or all those bands.  OCF Masters antennas are longer placing the resonant frequencies of the higher bands well within those bands.  Capacitive loads are then used to pull the resonant frequency of the lowest one or two bands up towards the center of those bands.  The placement of the capacitors is critical to avoid affecting the resonant frequencies of the upper bands. 

Capacitors connected to antenna wires are subject to two dangers.  The first is static build-up caused by friction and natural electrical activity.  A resistor across the capacitor bleeds off any accumulated charge saving the capacitor from electrical breakdown.  Additionally, Capacitive loads are subject to high currents and high voltages especially on the lower bands.  OCF Masters Loads are built to withstand both hazards.  Running more power to the antenna than the Load rating will lead to capacitor and antenna failure.

In order to make building our unique antennas simpler, we have put together the parts that are difficult to obtain, namely the capacitive loads, into insulator kits for 160M and 80M antennas.  The kits for each band cover powers up to 800 watts or up to 1,500 watts. The only other components needed are the Balun that is available from BalunDesigns.com and wire.  THHN wire is available at your local hardware or electrical supply store and FlexWeave™ wire is available on-line from DavisRF.com or AmateurRadioSupplies.com. 

80M SWR Curves
160M SWR 
Curves

View our latest published articles on the OCF Masters Blog.

Questions? Email us at: w1is@arrl.net

4 products
  • 80M. 800 Watt OCF Antenna Insulator Kit
    80M. 800 Watt OCF Antenna Insulator Kit - Battery Eliminator Store - battery replacement, aa battery to ac power, aaa to ac power, dc power, battery to usb, 9 volt battery to ac power, ac power adapter, 2 aa to ac power, 4 aa to ac power, 3 aaa to ac power, 9v to ac power, ac power supply adapter, cr123a, dummy cell, active cell, battery eliminator, replace battery, eliminate battery, remove battery, convert aa to ac power, 6 aa battery, 2 aa battery, 4 aa battery, 9 volt ac, 120v battery batter
    Regular price
    $45.95
    Sale price
    $45.95
    Unit price
    per 
  • 80M, 1.5-Kilowatt OCF Antenna Insulator Kit
    80M, 1.5-Kilowatt OCF Antenna Insulator Kit - Battery Eliminator Store - battery replacement, aa battery to ac power, aaa to ac power, dc power, battery to usb, 9 volt battery to ac power, ac power adapter, 2 aa to ac power, 4 aa to ac power, 3 aaa to ac power, 9v to ac power, ac power supply adapter, cr123a, dummy cell, active cell, battery eliminator, replace battery, eliminate battery, remove battery, convert aa to ac power, 6 aa battery, 2 aa battery, 4 aa battery, 9 volt ac, 120v battery ba
    Regular price
    $55.95
    Sale price
    $55.95
    Unit price
    per 
  • 160M, 800-Watt OCR Antenna Insulator Kit
    1 AA Cell, 1.5VDC - Heavy Duty, International AC Source - Battery Eliminator - Battery Replacement - Battery Eliminator Store - aa battery eliminator, battery eliminator store, 9 volt battery eliminator, d cell battery eliminator, 9v battery eliminator, aaa battery eliminator, usb battery eliminator, replace 4 aa batteries with ac adapter, d battery eliminator, dummy aa battery with leads, aa battery eliminator power adapter, 9 volt battery adapter, aaa battery eliminator
    Regular price
    $85.95
    Sale price
    $85.95
    Unit price
    per 
  • 160M, 1.5-Kilowatt OCF Antenna Insulator Kit
    1 AA Cell, 1.5VDC - Heavy Duty, International AC Source - Battery Eliminator - Battery Replacement - Battery Eliminator Store - aa battery eliminator, battery eliminator store, 9 volt battery eliminator, d cell battery eliminator, 9v battery eliminator, aaa battery eliminator, usb battery eliminator, replace 4 aa batteries with ac adapter, d battery eliminator, dummy aa battery with leads, aa battery eliminator power adapter, 9 volt battery adapter, aaa battery eliminator
    Regular price
    $105.95
    Sale price
    $105.95
    Unit price
    per