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Re: uBITX - Sensible mods #ubitx

 

Marco KG5PRT and Rahul VU3WJM

Grounded Gate with a pair of IRF510's in push-pull configuration is interesting.? I may
have to try it sometime.? In tube technology the grid is placed between cathode and plate
but in MOSFETs the gate varies apparent resistance between source and drain.?
I don't clearly understand the subtle differences.?

Grounded gate operation is routinely used with J-FETs as small signal amplifiers, but I
could not find any on-line examples of similar operation with power MOSFETs.





Is there a particular reason that apparently nobody uses power MOSFETs in common-
gate configuration?

Arv? K7HKL


On Thu, Dec 28, 2017 at 2:54 PM, M Garza <mgarza896@...> wrote:
Would grounded gate work for SSB?

Marco - KG5PRT?

On Dec 28, 2017 2:54 PM, "Rahul Srivastava via Groups.Io" <vu3wjm=[email protected]> wrote:
Over the years I have seen the love hate relationship with IRF510, it has been used and abused in CB, KPA100 amps of Elecraft right down to Ubitx. Everyone grumbles about the high gate capacitance ... well FETs are akin to valve how about using them in in grounded gate configuration the gate capacitance goes to ground understandably the over all gain would be slightly low something akin to 10 dbs per stage but on other hand it will work with some good gain upto higher freq range.

A? thought

73

Rahul VU3WJM?
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