Dear All,
I had found the schematic for a 150Watts mosfet amplifier for Hf Bands here: http://radiotengkorak.blogspot.ca/2012/05/150-watts-mosfet-irfp250-rf-linear.html
It seems like the designer uses different transformers for DC and the Output network which seems very close to another power amplifier used for 500Wts on 2Mhz. I have reading also that using DC coupling capacitor in series with drains will help for unbalance on the mosfets, the link above uses parallel capacitors instead of series. In this case I am considering to change the mosfets for this ones STP16NF06 ( 60V/16A,0.1Ohm , 315pF In , 70pF Out, Cross 70pf, Qg 13nc) or maybe this ones IPB06N03LA (25V/50A,5.9mOhm , 1995pF , 848pF Out, Cross 124, Qg 14nc). So I want to know which criteria is required to choose for the best mosfet for an amplifier in the schematic attached. My goal is to have a portable amplifier which delivers around 50 or more Watts on the 500Khz to 1800Khz using two 12 volts batteries(in series as dual power - or a single 24DC) . ( I have build a driver using the Lt1210 (10Ohms imedance) from linear which is able to provide 3.5Watts on the mentioned band with the +/- 12 Volts.
Any suggestions are really appreciated
Regards
Patty
I had found the schematic for a 150Watts mosfet amplifier for Hf Bands here: http://radiotengkorak.blogspot.ca/2012/05/150-watts-mosfet-irfp250-rf-linear.html
It seems like the designer uses different transformers for DC and the Output network which seems very close to another power amplifier used for 500Wts on 2Mhz. I have reading also that using DC coupling capacitor in series with drains will help for unbalance on the mosfets, the link above uses parallel capacitors instead of series. In this case I am considering to change the mosfets for this ones STP16NF06 ( 60V/16A,0.1Ohm , 315pF In , 70pF Out, Cross 70pf, Qg 13nc) or maybe this ones IPB06N03LA (25V/50A,5.9mOhm , 1995pF , 848pF Out, Cross 124, Qg 14nc). So I want to know which criteria is required to choose for the best mosfet for an amplifier in the schematic attached. My goal is to have a portable amplifier which delivers around 50 or more Watts on the 500Khz to 1800Khz using two 12 volts batteries(in series as dual power - or a single 24DC) . ( I have build a driver using the Lt1210 (10Ohms imedance) from linear which is able to provide 3.5Watts on the mentioned band with the +/- 12 Volts.
Any suggestions are really appreciated
Regards
Patty
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