Mag loop controller advice?

[Radioberry]

Hi All,

As you may know i like the magnetic loop antenna.

It is all ready  long on the list to make it work with a vacuum c and a stepper motor.

From an old 3D printer  project i can reuse the stepper Nema 17.

Using an A4988 driver module.

Having a python flask web interface it is all working.

Now i have to bring the stepper and capacity near the loop (in the tube; see picture)

- do i need the controller close by? or can i use 10meter cable (or more) and control the stepper?

- i like to place a filter after the stepper controller module... i want no RF getting back ...

Do people have ideas  to solve this?

I like to control it using a rpi... so i can store the steps required for a certain freq.

also having a i2c vswr monitor tuning could be be done automatically.

Please let me  know if you have some direction or advice.

73  Johan

PA3GSB

[Bob A. Booey]

Hi Johan,

Have you looked at Loftur's (TF3LJ) Loop Controller?  Johan PD0LEW and I built the controller a couple of years ago and it works pretty well (but not perfect).  I did not have the controller close to the stepper/cap/loop.  You can use clamp-on ferrites to keep RF off the line going from the stepper to the controller.

73,

Robert, WA2T

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[pa3gsb]

Robert,

Tnx for the pointer!

Exactly what i was looking for.

73 Johan

PA3GSB

Op dinsdag 24 augustus 2021 om 19:42:14 UTC+2 schreef rent...@comcast.net: