Dead Bug Style Known as MMR-40

The project aims to produce SSB (voice) and CW (Morse code) operating modes on a low-power 40-meter rig with CW or PEP output of up to 6 watts.

This rig project can be built using 3 construction methods which include the printed circuit version, pseudo circuit board method, and dead bug method. There are advantages and disadvantages however for each method but in this project, more details were provided on the dead bug method to build the MMR-40. There are several stages that can be tested during the construction of the MMR-40. The PTO oscillator is the first stage followed by the audio and control circuit, the receiver section, and the transmitter sections.

A coil wound makes up the PTO which is supported by two brass nuts soldered to the copper foil of the board. The side to side play in the tuning screw is eliminated by a third nut. In building the PTO oscillator circuit, the J310 JFET and 7805 regulator are mounted with their legs in the air. Some parts are lying down or at an angle. The oscillator feedback turns come out to the correct pads through L2 coil.

Read more