Donnerstag, 19. September 2013

Magnetic Loop antenna for repeater operation

You can use the benefits of magnetic loop antennas not only for one single frequency but also for two spaced frequencys.

I have made two experimental antennas: one for 70 MHz and 74.5 MHz (f-shift 4,6 MHz) and an other one for 145.1 MHz and 145,7 MHz (f-shift 600 kHz).

The loops are in a 90° angle to each other.

In the ensuing pictures you see the measurments and pictures for the 70 MHz version.

This solution is maybe interesting in ambients where is to much RF in the air and the RX is overloaded.

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