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

[@AllElectronicsChannel]

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[@joaopaulocoelho5401]

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

[@AllElectronicsChannel]

Hey man, I have other videos showing that. There is one video called "how amplifier work" something like that - take a look here on the channel ;)

[@kapilgavali]

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

[@Bremontval]

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

[@sergiosilvaneres1013]

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

[@AllElectronicsChannel]

Nice! We will approach these topics in next videos. Thank you!

[@camilosoveral7294]

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

[@AllElectronicsChannel]

Hello friend! In this video I used an old BF199 transistor.

[@camilosoveral7294]

@@AllElectronicsChannel Thanks.

[@danosdotnl]

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

[@AllElectronicsChannel]

If I'm no mistaken it is a simple BF199 common emitter!

[@danosdotnl]

@@AllElectronicsChannel Thanks! Will conjure something up and report back

[@pawank.patidar]

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

[@AllElectronicsChannel]

This was an old BF199, it works good for FM

[@pawank.patidar]

@@AllElectronicsChannel thank you sir

[@shahidularmaan4499]

is the gain same as small signal gain?

[@AllElectronicsChannel]

Yep, it is the small signal gain squared, when the input and output are presented with 50ohm

[@zhitailiu3876]

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

[@AllElectronicsChannel]

Indeed! Thank you!