[Elecraft] K4 Pricing Posted

[Jim Brown]

On 10/8/2020 10:43 PM, JR wrote:
> K9YC published a paper purporting to document and quantify transmitter 
> noise figures - which belies the claim and ultimately validates what the 
> ARRL Lab told me - namely neither rig is a problem.

ARRL Lab engineers are not active in contesting, hence are unlikely to 
see these problems. My "paper" you referenced is a re-plotting of ARRL 
Lab data for all rigs on the same scale, and at scales large enough to 
clearly see differences. It is THEIR DATA, not mine.

Not a problem? Yaesu rigs used to be pretty clean on SSB; current 
vintage Yaesu rigs are VERY dirty on SSB, occupying three times the 
bandwidth of a clean SSB signal. W4TV, a retired broadcast engineer, 
traced the cause down to their method of doing ALC. I became aware of 
this when trying to work next to one of these dirty stations on the 
band; the P3SVGA display clearly showed the IMD-caused splatter on both 
sides of the station's intended signal. The splatter extended more than 
2 kHz below his USB suppressed carrier frequency, and almost than 5 kHz 
above it. A clean SSB signal (not ESSB) signal is about 2.7 kHz wide.

After this first experience, I observed a lot of signals like this, and 
asked some of them what rig they were using. It was nearly always a 
Yaesu. Those that were not were splattering because they were 
overdriving their amp.

This is NOT parochialism, it's solid engineering, which is my expertise. 
What's yours?

73, Jim K9YC