The 7MHz transmitter of the CQ Ham Radio July issue can be upgraded with parallel 2SC1815GR. The orignal PA has only one 2SC1815GR, but JM6QAL has been changed to two 2SC1815GR at PA stage. You can look at the parallel 2SC1815GR which can generate over 430mW although the single one is only 200mW.
I've got one board and made this transmitter with parallel 2SC1815GR. I need to have the receiver that can work with the transmitter.
The 2SC1815 is the typical transistor in Japan. There are sub-alphabet like O, Y, GR, BL for different hfe.
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