Re: Bias on the U3S ouput stage question

Chris Wilson

Hello Allison,

Thanks for the heads up, understood, cheers.

Sunday, June 16, 2019

Best regards,
Chris 2E0ILY mailto:chris@...

aK> For digital modes most, but far from all, are class C, D or E.

aK> The biggest fet a a BS170 can drive is an ambiguous question.
aK> Assuming you are getting 300mW of output the largest fet would
aK> produce as much as 3 to 6W is properly matched and an
aK> IRF510 or 530 can do that. It really depends on how much
aK> drive you can have as the gain of most of the IRF MOSfets
aK> is about 13-16DB.

aK> FYI if you willing to spend a lot of money you can use UHF RF
aK> rated mosfets like MRF137 which will have 20db or so gain
aK> at 10mhz. Very good construction and all good care plus
aK> a 28V power source will be required. Its a 30W output device.

aK> Allison

Best regards, Chris Wilson (2E0ILY)

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