Amplifier for 6 meters

[VK6ZFG]

Hi Ron

The MRF492 is rated for a maximum output of 70W.  It loses linearity if used above this power level.

I have modified DSE K6349 100W PAs that use two MRF492s from 100W to 130W output.  This involved replacing the PA coil with a much heavier gauge wire and likewise the filter coil and capacitors.  It also greatly improving the bias circuit which is not just a simple diode based one.  

A single MRF492 will not get you a clean 100W especially if a simple diode based bias circuit is used as per the DL5DBM article.

73s

Igor

Hi Igor

The transistor being used in the amplifier is now a 2SC2879.  After receiving some excellent advice I discarded the MRF492.

Between natural disasters, I am wiring up the switching relays, so almost ready to go.

73

Ron

Hi Ron

The 2SC2879 is a better transistor but it is listed as a 2-30 MHz device so may not work too well at 50 MHz.

73s

Igor