[Elecraft] Orion added to Elecraft rig RX comparison page

[Eric Swartz WA6HHQ - Elecraft]

Hi Dave,

The phase noise from the PLL is a contributing factor in the BDR, but in the 
case of the Orion and the K2 it is not the limiting factor. In those cases 
other amplifiers in the RX chain are probably limiting out before the phase 
noise comes into play.

Also, the ARRL tests phase noise in -transmit-, so additional noise sources 
may be coming into play that are not present during receive.

73, ERic


drcuthbert@micron.com wrote:

> I notice that the K2 phase noise at 4 KHz offset the LO is -124 dBc. The BDR at 5 kHz is 135 dB. Shouldn't the phase noise dominate and determine the BDR at this offset? I am making the assumption (perhaps incorrectly) that if the phase noise at 5 kHz offset is -124 dBc then a signal at +124 dB above the desired received signal will mix to produce noise of 0 dB (referenced to the received signal). Note that I am assuming the phase noise at 5 kHz offset is the same as at 4 kHz offset. 
> 
>    Dave WX7G
>