Owen Duffy wrote:
"998cc" wrote in
et:



The good thing is that your 5WL Yagi will have a good deal of selectivity
whereas it is certainly lacking in the '706IIG and in many of the lower
cost preamps (no money wasted on filtering).

I suspect the preamp makers would portray this as providing more system
engineering flexibility, letting you, the system builder, decide how
much filter selectivity (and corresponding loss/degradation of NF) you want.

After all, if you were doing EME with a big array pointed up into the
sky, selectivity might not be such a big deal, but absolute lowest
system noise figure might be.