Magnetic Loop for 40m, 30m & 20m

Contents

Section 1 | Introduction
  • Summary
  • Main Parts
  • Specifications
Section 2 | Construction
  • Aluminium Preparation
  • Frame Construction
  • Loop Wrap
  • Coupling Loop
  • Capacitor
  • Motor Control
  • Control Box
Section 3 | SWR and BW
Section 4 | On Air Experience
  • First Contact
  • Contact with Portable Station
         

 

Section 3 SWR and BW

SWR was measured using an antenna analyser which outputs data to a computer. From there I used excel to graph the results as shown below.

40m Band

SWR 1:1 at 7.132MHz with a -3dB bandwidth of 11kHz.

 

20m Band

SWR 1.33:1 at 14.15MHz with a -3dB bandwidth of 64kHz.

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Written by [email protected]
Last updated 16th April 2017