Re: RF amplifier with one or two transistors

Yes, that's pretty much the same classic 4:1 TLT based circuit I posted up earlier but the circuit in your link is configured for much higher gain.

I'd expect it to show more than 20dB gain and presumably it will require a more careful layout to prevent possible instability up at VHF and UHF. I configured my version for 15dB gain but it's essentially the same type of amplifier :)

I had mine in mind on reading the initial few posts, and though I did see your posts with the same config/ minor variations, I thought i'd post mine anyway..... Haven't done any simulation analysis, but have done quick implementations for fixed lower frequencies (VHF). worked quite well.

Thanks again G0HZU,

So, 4:1 TLT has in fact two coils with equal number of turns, wounded at the same time. I made another transformer and I have 40uH on each winding. When they are put in series, both measure 152uH.
Now the gain has increased to 19dB at 7MHz.

Best regards,
Nicolae