16 Apr 2015

Loop motors

Magnetic loop antennas can be very effective, small, antennas. They work well and are ideal for modes like WSPR, JT65, JT9-1 and PSK31 where frequencies don't have to be moved much. Their main disadvantage is they are narrow-band so require retuning if moving very far in frequency and they are directional.

As ever, Steve G1KQH has been tracking down bargains - in this case motors that could be used to either tune or rotate loops.

Tune up your loop remotely, only needs a coupler and a bit of ingenuity which I know your not short of?



They also have 6 volt too


Just needs a simple adjustable Voltage regulator.

20RPM model on eBay




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1 comment:

  1. G1KQHThu Apr 16, 02:04:00 pm GMT+1

    You could use one of these cheap variable reversible drives to power the DC motor..

    http://www.ebay.co.uk/itm/High-Power-PWM-Motor-Speed-Controller-Reversible-Control-Switch-DC-12V-40V-NEW-/271652767911?pt=LH_DefaultDomain_3&hash=item3f3fc448a7


    All you require then is to add a couple of limit switches, to stop the motor at each end of the travel of opening or closing the variable capaictor.


    73 Steve

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