[Ronja] Spectral analyzer up to 8 GHz

[Karel Kulhavy]

---- Gregory Maxwell <gmaxwell at gmail.com> schrieb:
> On Tue, Oct 14, 2008 at 4:42 AM, Karel Kulhavy <twibright at hispeed.ch> wrote:
> > Due to low achievable gain I had to upgrade the 2N3904 in the design (Ft=300 MHz)
> > to BFR90/91/91A (5GHz). 2N3904 oscillated at 500 MHz so I expect these to oscillate at
> > 8GHz. Does anyone has a spectral analyzer like this or a scanner (communications
> > receiver)? When I build the limiting amplifier cell I have to check it doesn't
> > oscillate.
> >
> > Or do you know any technique how to check for oscillation without such high frequency instruments?
> 
> I wonder if you could get a confident idea if its self-oscillating by
> simply measuring the current draw?

Unfortunately not - the current draw will be enforced to a preprogrammed value by current sources.

Karel