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 QRO Mag Loop MKII new youtube video showing dual steppers 
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Post QRO Mag Loop MKII new youtube video showing dual steppers
A quick update,

Since I designed the original auto tuning mag loop I've been working on ways to improve the match such that regardless of the applied frequency it always presents a good match to the radio and hence optimum performance.

The youtube video below shows how this has been done and how quickly the loop can qsy from 3.7MHz to 14.2MHz while still achieving VSWR of < 1.3, all in a matter of seconds - largely due to micro stepping the stepper motors and using controlled acceleration / de-acceleration techniques.

Really makes a mag loop a joy to use - no more fiddling back and forth trying to get it tuned correctly.

http://youtu.be/lMzEijSj6G0

73 Tim

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G8GIW licensed in 1972 (C&G RAE), then G4WIM in 1984 (12 wpm CW test), then KT6UK in 2000 (USA Extra Class), now safely back in the UK and retired early (Google bought the company I was working for !)


Sun Aug 09, 2015 2:32 pm
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 QRO Mag Loop MKII new youtube video showing dual steppers 
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Post Re: QRO Mag Loop MKII new youtube video showing dual stepper
Well done Tim...
I enjoyed the video......as someone who spent weeks trying to remotely control
a homebrew loop when it appeared in Radcom years back.....Robert Craighero article IIRC....i would have killed for your device....

Again.......nice one.

Roger G0IUW


Sun Aug 09, 2015 3:29 pm
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 QRO Mag Loop MKII new youtube video showing dual steppers 
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Post Re: QRO Mag Loop MKII new youtube video showing dual stepper
excellent piece of kit Tim and a great video demonstration

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Sun Aug 09, 2015 4:37 pm
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 QRO Mag Loop MKII new youtube video showing dual steppers 
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Post Re: QRO Mag Loop MKII new youtube video showing dual stepper
I can only imagine the amount of time you have spont on that . I take my hat off to you Tim great work.


Sun Aug 09, 2015 5:05 pm
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 QRO Mag Loop MKII new youtube video showing dual steppers 
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Post Re: QRO Mag Loop MKII new youtube video showing dual stepper
Hat's off Tim, great project and excellent video. Wish I had your skills.

Tim


Sun Aug 09, 2015 5:35 pm
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