When I connect a 50-ohm dummy load to the tuner output, it will not retune when I press the TUNE button. Why?
A. The interface always starts the tune process by resetting the tuner to bypass, connecting the radio directly to the antenna. The 50-ohm dummy load provides a good SWR regardless of frequency. The tuner sees that the SWR is good so it just stays in bypass. With a “real” antenna such as a whip, the tuner finds the SWR high when bypassed and so it performs the tuning process. Try a 100-watt light bulb as a dummy load on the output of the tuner as suggested in the SG-237 manual.
