On Fri, 25 Apr 2014 20:19:42 +0200 "Björn Gabrielsson" <b...@lysator.liu.se> wrote:
> > On Fri, 25 Apr 2014 12:21:04 -0400 (EDT) > > gandal...@aol.com wrote: > > > >> Coincidentally, I came across this earlier today when looking for > >> some MMIC data, perhaps it might be worth a look?........... > >> > >> http://lna4all.blogspot.co.uk/ > > > > Now that's almost perfect! Only two modifications and it does what > > i need it to do! Thanks a lot! > > Next time I will try a ZX60-P162LN+ from Mini-Circuits. > > http://217.34.103.131/pages/s-params/ZX60-P162LN+_GRAPHS.pdf > > only $54 for a boxed unit. Bias-T needed to. > > -- > > Björn > Aren't these DC to daylight low noise amps fiction? I was told it is really hard to design a LNA that is optimal for more than an octave or so. http://www.datasheets360.com/pdf/-5223408218466592358 That minicircuits looks like a good match for 1090 mode-s. Probably good enough at GPS frequencies too. The input VSWR is good at GPS frequencies and the output VSWR is OK, maybe a little higher than you would like. It looks they tuned it for 1GHz. And yes, amplified noise is amplified noise. But it is a matter of the noise figure of your receiver. If you are using a crappy DVB-T which has a noise figure around 5db, you would appreciate the 0.5dB of the minicircuits. The front end determines the overall noise figure in a good design. With a gain of 20dB, the noise of the DVB-T is not the determining factor. But antenna gain is always better than amplifier gain. Regarding the GPS application, you would need to know the noise figure off the receiver. All this said, I think an amplified GPS antenna is cheaper in the long run. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.