Preamp for 40m DC Receiver

I have tried a few times to include a preamp in my DC Receiver project and each time I have had utter failure and that was using circuits that others have used and found to be reliable, so go figure. Rather tan trying to do the most ultra low noise amp, I figure i should just make a class A with a BJT and stick it in the circuit and see how it goes, it cannot be any worse than what I have managed previously, IE Failure.


So i have all the bits laid out ready to ugly build the hell out of this. The transistor is a 2n3866 RF transistor with a FT of over 500mhz, should be more than adequate for 40m HIHI.


Built and ready for testing.


Scope, signal source and power connected for smoke testing.


Feeding it with a very small 7mhz signal. The receiver is for 40m after all.


Success, 4v p-p with 50mv drive, now i just have to wire it into the receiver and see if it works.


Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.