- Out-of-Stock





Ref: MFJ557
Out-of-Stock557
These oscillators allow you to practice sending code at home, at work, in the field, or practically anywhere, because they are easy to take wherever you may go. Internal speaker volume adjusts from barely audible to full volume of sound. A tone control gives you wide adjustment from high-pitched to low-frequency tones. You even get a headphone jack for totally private practice. If necessary, you can connect an external speaker for loud classroom audio.
The MFJ-557s run on a single 9-volt battery (not included) or optional AC power. They also have adjustable coding contacts for customized comfort. When you're done developing skills with the MFJ-557, plug the key directly into your transmitter or transceiver and go on-the-air!
Learning Morse Code with an Oscillator Practice Code is Easy! Get one of your MFJ-557 Deluxe Morse Code Practice Oscillators from DX Engineering and start enjoying Amateur CW Radio communication
Data sheet