[Elecraft] KX2 and Sherwood Eng. RX Performance Ranking?

[Jim Brown]

On Wed,3/8/2017 8:41 PM, w7aqk wrote:
> you are right to be concerned about how clean a transmitter is, but 
> there are regulatory requirements about that. If you don't meet those 
> standards, you supposedly can't sell it!!! 

Sadly, it goes FAR beyond that.  See my comparison of ARRL Lab data for 
selected popular rigs, some of them in the $10K range.   Some of the 
most expensive are really dirty on CW. http://k9yc.com/TXNoise.pdf  Also 
look at

http://k9yc.com/P3_Spectrum_Measurements.pdf  which consists of 
measurements I've done myself of rigs that were made available to me.

> Most of the bad signals I hear are, I think, because someone is 
> running things at "maximum'!

Partly true, but some rigs are FAR dirtier than others. The link about 
concentrates on CW.  Many popular rigs generate splatter in their output 
stage due to poor design of TX ALC. Using ALC between the rig and a 
power amp to set TX power is recipe for splatter and clicks. Mistuning a 
power amp, or failure to match an antenna to the power amp also causes 
splatter and clicks.  See http://k9yc.com/K6XXAmpTalk.pdf

73, Jim K9YC