To generate audio tones, I used DigiPan v1.6d on a laptop computer. The audio transformer on the QRP transformer is plugged into the amplifier speaker output on the front. I copied a short bit of text from the DidiPan help file and placed it in the transmit window to be sent. I use a Kenwood TS-570D to receive, the antenna is a short piece of wire from a Heathkit 2m field strength meter. The antenna being amongst electronic devices also adds noise to the system. The transmitter operates into a 50 Ohm load.
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