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CHA F-LOOP 3.0 Engineering and System Behavior

The exact tuning box, selected Standard, Double, Booster, or Rigid radiator, proprietary coupling loop, mast/support, 12-foot RG-58 feed line with integrated choke, and final orientation form the antenna. Standard, Double, Booster, and Rigid arrangements cover different frequency ranges.

Product Installation Guides CHA F-LOOP 3.0 Reviewed 2026-07-14
Start with the operating decision: The exact tuning box, selected Standard, Double, Booster, or Rigid radiator, proprietary coupling loop, mast/support, 12-foot RG-58 feed line with integrated choke, and final orientation form the antenna. Standard, Double, Booster, and Rigid arrangements cover different frequency ranges.

How the system behaves

The loop’s compact 34-, 36-, or 48-inch diameter can fit sites that reject long wires or radial fields, but narrow 2:1 bandwidth, manual tuning access, 25 W intermittent SSB / 10 W continuous-mode limits, and sensitivity to nearby metal are real operating costs.

The boundary that prevents mistakes

Use an external SWR/power meter and low power. Adjust the tuning control slowly for the selected frequency; the high-Q loop must be retuned after a meaningful frequency, radiator, position, or environmental change. Do not use an antenna tuner or coupler to conceal mistuning.

Use this field sequence

Assemble only one guide-defined radiator arrangement, support the loop without distorting it, keep people and conductors clear, connect the feed line, set the tuning capacitor before applying power, and rotate the completed antenna for the required signal or noise null.

Source boundary

CHA F-LOOP 3.0 User Guide 221107. Use the exact current configuration, components, feed, support, geometry, power, and safety limits; mechanical fit does not establish compatibility.

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