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
--
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