7-MHz Loop Antenna

Posted on Feb 6, 2014

The loop may be fed inside the center of one of the vertical sides if vertical polarization is preferred. For horizontal polarization, it can be necessary to feed either in the horizontal sides in the center. Optimum directivity happens at proper angles towards the airplane in the loop, or in much more hassle-free terms, broadside through the loop

7-MHz Loop Antenna
Click here to download the full size of the above Circuit.

. One need to try to hang the program from on the market supports which will enable the antenna to radiate the utmost amount in some favored path. The overall length of the wire utilized in a loop is determined in ft in the system 1005/f (MHz). Therefore, for operation at seven. 125 MHz the all round wire length are going to be 141 ft. The matching transformer, an electrical 1/4 G« of 75-G™ coax cable, is often computed by dividing 246 by the operating frequency in MHz, then multiplying that amount by the velocity element from the cable becoming utilised. Therefore, foroperation at 7. 125 MHz, 246/7. 125 MHz = 34. 53 feet. If coax with reliable polyethylene insulation is employed, a velocity issue of 0. 66 have to be employed. Foam-polyethylene coax features a velocity issue of 0. eighty. Assuming RG-59 is utilised, the length of the matching transformer will become 34. 53 (ft). 0. 66 = 22. 79 feet, or 22 ft, 91/2 inches. This same loop antenna may well be used to the 14 and 21-MHz bands

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Remote IR controller
    Disco Smoke controller
    Echo Chamber
    arduino Sharp IR distance sensor outputting consistently high voltage
    ac power control with thyristor
    counter down timer circuit
    USB Power Injector For External Hard Drives
    DIY Micromitter Stereo FM Transmitter
    Safe Oscillator For Watch Crystals
    INA331 332 configured to directly drive the capacitive input A D converter circuit
    Fully automatic watering circuit for flower pots