Fox Transmitter 80M now Working

 

This work started in Januari 80m Fox it has now came to the end.

The Fox-Transmitter fail in the beginning of the same week that i wont to use them for a competition her in Sweden. Two of the foxes burn up the FET IRF510 after a few minutes. I have a older board off this type and it has run for several years.  As I understand the problem is the high capacitance between terminals on this FET. It was not possible to load the gate more (1k ohm). So I tried to change the FET to a NPN transistor BC139 and it looks promising. I change 2 components R to C and put in R on not used pads. 5 Foxes has now been working for several hours, and in a small competitions W31. But it was a hard fight against  Murphy. I will build 2 more this winter. Stay tuned.  My son has also updated the SW with more Features. I f you won more info please contact me.