I am sure that your comments on mag loop capacitors are accurate, however when running 100 watts into the loop with approximately 5000 volts (very big gap between rotor and stator) across the

Hi Immo, I think you have explained the issues perfectly. I think it's important that users are aware of the mechanical makeup of capacitors used in Transmitting Loops. I've seen a number of loops

Hi all, Why does the axle of a VVC needs to be isolated and that of a Butterfly-C not? I think it would be going too far to describe the electrical states during operation using mathematical

If it is a Transmitting Loop the voltages on the capacitor plates can be in the hundreds to thousands of volts depending in TX power. This requires isolation somewhere in the system least a shock (or

Noticed that and definitely not cheap and affordable. I'd say that while this group has the best tuners out there they are not the simplest tuners and require some work to get going.

Found it... https://www.youtube.com/watch?v=xHVkqz3T_l8 The capacitor could be being used to filter the RF and keep it out of the wire but I'm not an engineer, this is only a thought.

hi Patrick, look at webpage of mfj… But they don‘t have such a comfortable way of tuning… abt 450$ a piece. 73

Interesting, which antenna is this?

hi Gill, I know why! They don‘t use VVC‘s 73, DL5KB

I don’t think so. MFJ may sell more mag loops than anybody, and they don’t use an insulated shaft.

Many thanks Immo for the sound explanation. I will implement the required isolation. Best 73’s. Jim EI4HH. Sent from Mail for Windows From: Immo, DL5KB Sent: Thursday 1 September 2022

I didn't bring this up to implement auto-tuning. The hardware from Loftur will handle that. based on stored frequency/positions. I'm trying to avoid needing a separate SWR meter. While the IC-7300

hi Joe (VE7VXO) and all thinking about this... getting SWR via CAT from the TX will be too slow, even if it's possible. One poll every second will lead to nothing... While tuning the stepper makes

Hi James, if you do use your loop only for receiving, you might couple it direct to the stepper (result is a little degrading of possible receiving quality). If you like to transmit with your loop,

It's to avoid charging the stepper motor with RF and potentially creating RF inductance between the motor and the motor's circuits and any other circuits in the electrical path such as the

Just wondering if it is absolutely necessary to insulate the VVC shaft from the stepper motor shaft?

If you are considering this to allow the loop tuner to auto tune without having built the SWR bridge hardware in the loop tuner, doubt this will be of much use. The communications delay is much too

Has anyone tried swapping out the dc motor for a stepper and running this with the tuner? There are already limit switches on the chassis so assuming the thing is geared down sufficiently I think this

I tried to get the software working with an ESP-32, without success. Didn’t work at it for very long, though, and it compiled without errors. Must have been some flaw I couldn’t find. It didn’t

Thanks for the feedback:- Software can be resolved. It’s the interface that is more of a problem But Negative input will not solve the legacy problem. Software :- can be