From 46b7b0bc7d491769db67ca5fdac98da3c5fcf7ca Mon Sep 17 00:00:00 2001 From: thetechprepper Date: Sun, 22 Mar 2026 20:26:27 -0700 Subject: [PATCH] offline - Added simple reference for half-wave dipole --- .../skel/Desktop/offline/reference/dipole.md | 42 +++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 overlay/etc/skel/Desktop/offline/reference/dipole.md diff --git a/overlay/etc/skel/Desktop/offline/reference/dipole.md b/overlay/etc/skel/Desktop/offline/reference/dipole.md new file mode 100644 index 0000000..70b429e --- /dev/null +++ b/overlay/etc/skel/Desktop/offline/reference/dipole.md @@ -0,0 +1,42 @@ +--- +title: "Half-Wave Dipole Antenna: Quick Reference" +date: 2026-03-22 +updated: 2026-03-22 +author: [The Tech Prepper] +categories: [radio, antennas] +tags: [dipole, hf, antenna, reference] +copyright: "(C) 2026 The Tech Prepper, LLC" +--- + +The half-wave dipole is a simple and effective HF antenna for field +deployments. + + +## Formula + +**Total Length (feet):** + +468 / Frequency (MHz) + +**Each Leg:** + +234 / Frequency (MHz) + + +## Common Band Lengths (U.S. General Center Cut) + +The following are example center frequencies. In most cases, they +favor the digital portion over the voice portion of the band. + +| Band | Frequency (MHz) | Total Length (ft) | Each Side (ft) | +|------|-----------------|-------------------|----------------| +| 80m | 3.5625 | 131.4 | 65.7 | +| 75m | 3.900 | 120.0 | 60.0 | +| 60m | 5.359 | 87.3 | 43.7 | +| 40m | 7.100 | 65.9 | 33.0 | +| 30m | 10.125 | 46.2 | 23.1 | +| 20m | 14.100 | 33.2 | 16.6 | +| 17m | 18.118 | 25.8 | 12.9 | +| 15m | 21.100 | 22.2 | 11.1 | +| 12m | 24.910 | 18.8 | 9.4 | +| 10m | 28.150 | 16.6 | 8.3 |