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It is possible to make any Kenwood hybrid unit transmit AM by adding a modulator to a low level RF stage
This handy little buffer board is barely the size of a quarter
providing a wireless sidetone for CW transmission
making it a handy code practice oscillator
The board is fully assembled
Drake R-4A R4B Product Detector Upgrade It is possible to makeThe dual diode product detector in the 11 tube Drake R 4A (aka R 4A "late") and the Drake R 4B has poor dynamic range, promoting distortion on AGC attack. This manifests itself as annoying clicking and popping on strong signals. A modern adaptation of the former Sherwood board, this active Gilbert cell detector will correct this deficiency. Installation takes only about 30 minutes but does require basic soldering and schematic reading skills. Board
US$ 43.00
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