Characterization of an RF amplifier - Gain | S21 - part 1 

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Hi Gregory Thank you for this very interesting video. So you are using a BF199 in common emitter mode. My 2 questions : - How did you calculate the values for biasing the transistor ? - I did know that the gain is decreasing with the frequency, but is there any formula to approximate it without the spectrum analyser ans the signal generator ? I will use it at about 130 MHz. Also one remark : you are using 1 nF input and output capacitors. So I am expecting that these values are too high for the tests for high frequencies. Depending on the manufacturers, the BF 199 has a Ft (transition frequency) at about 400 Mhz. Thanks in adavance for your answer ! Philippe

Hi.Nice video. It would be nice to see how the amplifier was designed. what was the design specifications and how those values turns out in practice. probably you can do a prequel video showing all that hidden stuff

What a out the losses of the cables involved at the source and spectrum analyzer?

Great video! It would be interesting to talk about neutralizing capacitors and matching networks.

Hello friend, in this video I didn't say which transistors were used in this assembly, I calculate that there may be a video that talks about this assembly and I would like you to put the link if possible or inform what they are. Great video, I already liked it. Thanks

Great video, is the schematic of the DUT somehwere? Would be nice to replicate and test along!

Which transistor used in amplifier. Can we use for FM radio

is the gain same as small signal gain?

It should be |S21|, but great video anyway! Thx!