On Mon, 28 Nov 2011, Lemon Tree wrote:

How difficult are transistor with an Ft of 5GHz to use? There are
some really cheap ones around these days like the 2sc3356 for
example. I'd like to some to make a regenerative receiver but I worry
that even after careful PCB layout I would still have problems.
Anyway I am starting a new website where I intend to present many
useful circuits. It is located at http://circuitprofile.scienceontheweb.net
At the moment there is only XOR circuit, but that XOR circuit should
be helpful for anyone making a huff and puff stabilized oscillator
circuit.

But why?

Cheap really high frequency transistors are great, when you need very high
frequency characteristics.

But there are also plenty of cheap transistors that don't go so high in
frequency that are more than good enough at lower frequencies.

Those "lesser" transistors have to be more available than the really high
frequency transistors.

Take note that a lot of "popular" transistors are that way because they've
been specified in construction articles, which in turn causes the parts
places to carry them, which then also means others specify them in
construction articles.

Michael VE2BVW