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To be preamp or not?

When time come to choose between preamp brand the NF factor and gain are to be considered (there is an ideal mix?) At 437mhz 
we often see gain around 17db and NF .7db+ -. On the icom AG 35 the specs reported gain over 15DB! but nothing more.  Did 
anyone knows sources to check more precisely this preamp figures?

"That a democracy can't do certain things if in fact its citizens don't support it"
Lieutenant general James Conway June 16 2005.

Luc Leblanc VE2DWE
Coordonnateur AMSAT Quebec coordonnator
AMSAT 33583
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