Hi Glenn, thank you for a response.
Another few trials of transmitting into a dummy load resulted in power dropping to less than 1Vpp.. and staying there. :-(
I suspect MPS2907 is dead, voltage on BS170's drains is close to 0V during key down. Drive is a correct 0-5V square so I'm pretty sure it's the transistor.
I know MPS751 is a good replacement, but I'm not sure if I'll be able to easily obtain it - do you know any other replacements from BC series with >=1A Ic ?
Regards,
Olgierd SQ3SWF
