BF981 RF amplifier

Thread Starter

cippy432

Joined Jun 4, 2020
2
Hi all

How to calculate the input circuit with transistor BF981 for a certain frequency, for example 27 Mhz?
I need a calculation formula for this circuit.
Thank you very much!
 

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Thread Starter

cippy432

Joined Jun 4, 2020
2
Hi bertus
Thanks a lot for the link.
the schematic posted above I found it on a website, I didn't know it was wrong bias on G2.
I want to mention that I don't know how to do RF things, I just want try to make a functional input RF amplifier
I like this scheme, but I need a calculation formula for coils and the tuning on a certain frequency, now I need it on 27 Mhz

Best regards!
 

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