[Elecraft] Re： Down-conversion

[Scott Ellington]

I wonder if ANY commercial/military HF users require the kind of close-in dynamic range that we do.  If you have a choice, why would you design a communications system that allows signals within 2 kHz of each other with a 140 dB difference in amplitude?  Only the relative anarchy of the ham bands allows that!  I'm not complaining, as long as we have receivers like the K3.

73,

Scott  K9MA


On Nov 18, 2010, at 1:25 AM, Johnny Siu wrote:

> Pofessional radios employ up conversion scheme and wide roofing 
> filter.
> Of course, they have other expensive measures to ensure good 2Khz dynamic range.

Scott Ellington
Madison, Wisconsin
USA