Thanks to the reader that replied about my faulty Tecsun DR-920. I exchanged email with the seller, and he sent me suggestions (which I already tried, but I tried again for confirmation). He said he was in contact with Tecsun, and they have no further suggestions but they want to examine the radio. So I'm going to send it back and receive a replacement. I dug out the original box from my closet and removed the superfluous items, and I'll ship it once I receive the return address.