Everything you need to build the automatic magnetic loop tuner in just one picture. On the Flickr page, you can see the annotations. To reach the Flickr page, you need to click on the picture.
After some soldering, drilling, cutting, filing, screwing, programming and painting, … it will look like this:
Nice work!! Are you selling the kit? How much?. What about just the circuit board? How much? How can i order?
Hello Kent,
The kit on the picture was a result of the group buy that was organized by my local club and is not for sale.
I’ve sent you an email about the PCB’s.
73 de ON5IA
Hello
How can I buy a complete set?
Hello Denis,
I do have some leftovers from our club group-buy. I’ve sent you an email with details.
Hello there, congrats!!!
Nice job. I have many questions: 1. can I use this controller with my Yaesu FT 1000 Mark V?
2. Need it a special setup on the radio?
3. You still have a PCB for this project?
4. What about the software for this controller? how can obtain it?
Thanks in advance and have a great evening.
Gerardo. VA3GON
Hello Gerardo,
Yes, you can use this controller with your Yeasu FT1000 Mark V, you need to make a serial cable and select choose the correct interface in your radio (CAT). The software can be found on Loftur’s (VE2LJX) site: https://sites.google.com/site/lofturj/to-automatically-tune-a-magnetic-loop-antenna.
I’ve send you an email with more details about the PCB and the schematics for the serial cable.
73 de ON5IA
I would.like to buy a parts kit if any surplus are remaining. If you have enough interest may be you could put some more together. I have an FT450d radio but want to upgrade to may be icom as I want a pan scope. Will a pan scope be of use when using a mag loop as it is tightly tuned ?
A pan scope will still be of use when using a mag loop. It will help you to find the resonace point of the loop quickly. Although the weaker signals at the end of the band will not be shown anymore, you will not go completly blind when using a magnetic loop. I’ve send you an email with further details.
Hello, very interesting atu you develop. I’m wondering if it can be adapted to control a baby loop from ciro mazzoni. I own one but the commercial atu is only working in manual mode. In this antena the capacitor is tunned by a dc motor drived by l298n driver. Can we talk about this? 73’s
Hello, sure, no problem. We can discuss via mail. I’ve sent you a message.
Hello, will your ATU work on an Icom IC7100 or Yeasu 817.
Thank you! Tony KF7VLT
Hi Tony,
Yes this tuner works with both the IC700 and the Yaesu FT-817. You can even store the two radio profiles in the memomry and switch between them.
Hi,
I also have a Ciro Mazzoni Baby Loop. My controller has failed and I saw the above comment about it possibly being adapted for the loop, and it’s DC linear actuator. I’ve tried a PWM controller and tried tuning manually but it’s not very good.
I’d be interested in seeing if this could be adapted though.
73 Adrian M0OJR
Hello Adrian,
If you swap the DC motor with a nema stepper motor, I’m pretty confident you can make it work with the Loftur tuner. I haven’t seen a Ciro Mazzoni Baby Loop irl, so I can’t tell you how easy it can be done.
73
Hi do you still have PCB’s for this projects
Hi Don,
Yes, PCB’s are still available. I’ve send you an email with details.
73 de ON5IA
Hello Frederik, have you a kit of the automatic magnetic loop antenna? If not, have you a spare PCB and other spare parts?
Thank you.
73 Marco IU8HXM
Hello Marco,
Not a full kit, but I’ve some PCB’s left. I’ve send you an email with details.
73 de ON5IA
Hello
I am struggling to find anyone that has stock of the teensy 3.2 controller. Do you have any available plus the kist pls?
Mike ZL4MBW
Hello Mike,
Unfortunately not. The Teensy 3.2 is hard to get. I read even more disturbing news on the PJRC website that the Teensy may never return to full production. That really does put a damper on this project. I still have PCBs and basic components, but no Teensy 3.2’s.
73 de ON5IA
is there an erquavalent controller that one can use in place of the 3.2?
No, this project requires some specific characteristics of the Teensy 3.2.
Bugger! that is so dispaointing. Is it possible for you to review the desing with e view to use a controller that is available? Its such a waste to shelve it just because its main component is no longer available.Surely there must be an alternative that can be used?
Reading out the frequency of the radio and moving the stepper motor should not be a problem with anther platform.
However, measuring in real-time the SWR and adjusting the capacitor accordingly is a challenge that needs to be overcome.
It’s this feature that makes the tuner “automatic”.
Hi
what are your thoughts on this : Is it viable as a replacement do you think?
https://www.sparkfun.com/news/4266?fbclid=IwAR2UnOt3OBF-NtUN20VL7j5CduOK3SjMsvVgIhjFEim0sWZsqX-JsFSEVq8
Hi Mike,
For a automatic tuner without SWR readout, this will probably work. For the SWR readout we need more analoge bits than the Teensy 4.1 can support.
I would have to dig deep into the code to find a way to go around this. It’s not something I’m planning to do in the near future.
73 de ON5IA
I just found your site as I’d like to build the kit and a mag loop antenna. Do you have an update since March on the kit and / or parts status including the supply or replacement for the Teensy 3.2?
TKS & 73
Hello Ron,
The last batch of Teensy 3.2 are now available for sale at: https://www.pjrc.com/store/teensy32.html
Grab one if you can!
73 de ON5IA
I’d like a PCB too. How much memory is required on the Teensy 3.2?
I’m not sure anymore if it was 47% or 74% memory usage of the Teensy 3.2. Anyway, it was enough to run the code Loftur programmed on the Teensy 3.2. The biggest challenge for the moment is getting hold of a Teensy 3.2. As these are not produced anymore. I’ve started with building this project around a Teensy 4.1. The hardware part is almost finished, but I’m still nowhere with the software part.
News about Teensy 4.1? I wait for the new project
73 PAOLO IU0RCK