Sorry, you cannot place a new order from United States

Reduced Price New Deluxe Morse Code Practice Oscillator with Straight Keyer Expand

MFJ Deluxe Morse Code Practice Oscillator with Straight Keyer

MFJ Enterprises, Inc.

MFJ-557 by MFJ Enterprises, Inc.


The MFJ-557 lets you practice sending code easily and anywhere because its so portable.

More details


  • Volume Control adjusts from barely audible to blaring full sound so you you can practice without bothering anyone.
  • Tone Control gives you a wide adjustment from high "squeaky" to low "booming" tones.
  • Privacy: You even get an earphone jack for private listening.
  • Make it louder: You can plug in an external speaker for super high volume in the classroom.
  • Easy: With its straight Morse key and heavy non-skid metal base, learning code is so easy.


  • Volume Control.
  • Tone Control.
  • 3.5mm External Speaker Jack.
  • Encased in a heavy non-skid metal base.

Requires 9V battery (not included). Optional DC power supply can be connected to the power jack on the side.

No customer reviews for the moment.

Write a review

MFJ 1.8-170 MHz HF/VHF SWR Analyzer

MFJ-209 is a basic HF/VHF SWR Analyzer that lets you read SWR from 530 KHz to 230 MHz quickly only on a single analog meter.


This website uses cookies to ensure you get the best experience. By using our website you consent to all cookies in accordance with our Cookie Policy and Terms of Service.