Hi, can someone expand on the procedure for retuning a HRG-(VHF) helical resonator when the 3SK174 is replaced with a BF988.
I have recently sent an email to Hamtronics requesting further info on their suggestion (on their webpage) that states "It may require some retuning", but as yet there has been no response, except to suggest that they can source both FET's. 73 John VK4JKL IRLP 6163
