For those interested, I built an automatic tuner for magnetic loop antennas.
Using a 28X1 it drives a DC motor moving the high voltage tuning capacitor on the antenna until it gets to the SWR minimum. By storing the previously tuned frequency and the new frequency it drives the motor in the right direction so that it can be used with large value tuning capacitors covering more than one band.
To anyone interested, I can e-mail all data, code and pcb layout.
IZ3BGJ
Using a 28X1 it drives a DC motor moving the high voltage tuning capacitor on the antenna until it gets to the SWR minimum. By storing the previously tuned frequency and the new frequency it drives the motor in the right direction so that it can be used with large value tuning capacitors covering more than one band.
To anyone interested, I can e-mail all data, code and pcb layout.
IZ3BGJ