Gary WA5FWC operating the ART-13
Most phone (voice) amateur radio contacts use the single sideband mode (SSB), but the World War II era radios were not capable of operating in that mode. So, I called CQ using the SSB mode and asked the responding stations if they wanted to switch to AM mode. Gary WA5FWC operated the ART-13 transmitter whenever an operator had the capability to make a contact using the AM mode.