[Elecraft] RX Test (long)

[Julian, G4ILO]

Joe Subich, W4TV-4 wrote:
> 
> 
> Here is the genesis of the complaint that the K3 is more 
> fatiguing than other receivers.  The out of band noise 
> (noise above 5 KHz) in the K3 is, as you say, at least 60 dB 
> below the peak audio level (actually, I measure it at more 
> than 90dB down above 5 KHz).  However, the stopband also has 
> many leakage products (DAC artifacts) in the stopband some 
> of which are as much as 50 dB ABOVE the noise floor.  
> 
> While these products are well below the desired audio in the 
> passband, they are "in the clear" as far a local noise.  
> This requires the ear/brain system to subconsciously work 
> to reject (filter) the undesired discrete frequency products. 
> 
> 

But these "artifacts", at least in my observation, are only present when a
signal is present. If they are there when only noise is being received, they
are below the extremely low out of band noise level. Therefore, whilst I can
see that they could contribute to unpleasant or tiring sounding audio for
those blessed with acute hearing, I can't see that they would result in the
receiver sounding noisy.

-----
Julian, G4ILO. K2 #392  K3 #222.
* G4ILO's Shack - http://www.g4ilo.com
* KComm - http://www.g4ilo.com/kcomm.html
* KTune - http://www.g4ilo.com/ktune.html

-- 
View this message in context: http://n2.nabble.com/RX-Test-long-tp4275854p4277032.html
Sent from the Elecraft mailing list archive at Nabble.com.