How to Put Morse Code Keys on My MFJ-9420
Sending Morse code over an MFJ-9240 20-meter transceiver requires you to install a Morse code key. This means you must install an MFJ-415 CW Adapter, which lest you replace the voice microphone with a telegrapher's key. Making the connections is no more difficult than making the connection for any other plug-and-play device, such as a computer keyboard.
Instructions
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1
Remove the six screws that hold the cover on the MFJ-9240, using a screwdriver. Set the screws aside.
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2
Locate the removable cap on the adapter's push-button switch, at the rear of the adapter. Remove the cap.
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3
Set the L-shaped adapter in place. Position the narrowest side of the adapter at the front of the radio, parallel to the radio's face. There are four pins under the rear of the adapter and two under the front of the adapter. When the adapter is in place, push the pins on the bottom of the adapter into the pin headers on the transceiver.
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4
Secure the adapter in place. Use one 6-32-by-1/4-inch screw to hold the right forward corner of the adapter in place, and two 6-32-by-1/4-inch screws for each corner of the rear of the adapter.
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5
Replace the cap on the adapter's push-button switch.
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