You wrote:
In article .com,
"K7ITM" wrote:


As a point of reference, a typical NE3508M04
(http://www.cel.com/pdf/datasheets/ne3508m04.pdf) can give you a device
noise figure under 0.4dB, operated at room temperature, at any
frequency across the entire "UHF" frequency range (300MHz to
3GHz)--better than that at the lower end of the frequency range.

Cheers,
Tom



Nothing like a Ruby Maser dumped in Liquid Nitrogen and pumped at
-12 DBm to bring in those extremely small signals........

all it takes is cold...

It still takes cold but InP HEMTs perform much better than ruby masers
these days...

"Extremely Low-Noise Amplification with Cryogenic FET's and HFET's:
1970-2004"
http://www.gb.nrao.edu/electronics/edir/edir314.pdf


Happy reading!
-Galen, W8LNA