Re: RD16HHF1 power curve flattening...some

K9HZ All Messages By This Member #44317 开云体育 Perfect Glenn. ?Now if we can find current SMD parts to replace the 3904’s in place, this is a very nice upgrade.? Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: email:??bill@... ? toggle quoted message Show quoted text On Mar 11, 2018, at 11:02 PM, Glenn <glennp@...> wrote: I completed my mockup of the PA driver stages. as previous post: used MPSH10's in all stages.? Used FT37-43 toroids all wound with 10 turns 0.25mm wire either tri- or bi-filar according to original Sch. Bypassed all emitter resistors with a 220pF cap. swept from C80 input to T10 secondary (as wound) Result is a very flat response. Better than 1db from 3Mhz to 54MHz. glenn vk3pe <uBITX_PA_driver_stages_all emitter res bypassed with 220pF 120318.jpg>

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