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Wednesday 1 March 2017

Remote magnetic loop antenna tuner

As you know, magnetic loop antennas require a tuning capacitor to tune across a range of frequencies,this is usually done manually by tuning the antenna with the capacitor, for maximum noise or strong signal and low SWR.

Manual tuning is not always ideal if the antenna is some distance away, a remote tuner is needed and this is usually two parts, a motor with a reduction gearbox and a remote control with electronics to control the motor.

I have found a suitable circuit that can do this and the majority of the parts and the motor can be obtained from the same place, there is a transistor in the circuit that has been discontinued so I have to find a suitable alternative, which I am working on now.

Obviously I have yet to buy a tuning capacitor to build my loop but I have an idea where I can obtain these and can test the controller before I connect the motor to a capacitor.

further research is needed but I should be able to begin construction by the end of the month.

73 de M6RSQ

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