Episode 47 of Ham College continues studies for the General amateur radio exam. Topics include Single Sideband, Speech Processors, Automatic Level Control, Beverage antennas and more. 1:02:27 Download or YouTube
Thanks to Mike Herr, WA6ARA. He found my source code would not run with the DTMF module wired according to the published drawing. I've correct the code to agree with the drawing. You can download the updated version here. www.amateurlogic.tv/downloads/dtmf_relay_talk.zip