Transmitting with high SWR Home › Forums › QRP Transceivers › Transmitting with high SWR This topic has 0 replies, 1 voice, and was last updated 3 years, 10 months ago by ki7kqa. Viewing 1 post (of 1 total) Author Posts July 21, 2019 at 12:31 am #3841 ki7kqaMember I realized I transmitted for a bit with an MTR3B_LCD on 40m while my antenna was tuned for 20m, so the SWR was likely through the roof. What are the chances I caused damage? Was using a 12v battery at the time.. Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In