[Elecraft] RX Test (long)

[Joe Subich, W4TV]

> So what you are saying is the K3 is too quiet for its own 
> good, and that's what makes it so noisy!

No, the low stopband noise with (relatively) high levels of 
DAC leakage products is what makes the receiver tiring.  

It's the additional "noise" is in the 1000 - 3000 Hz range 
(with CW filter) that can be eliminated by reducing the RF 
gain that makes the receiver "noisy."

73, 

   ... Joe, W4TV 
  



> -----Original Message-----
> From: Al Lorona [mailto:alorona at sbcglobal.net] 
> Sent: Saturday, January 09, 2010 1:45 AM
> To: lists at subich.com
> Cc: Elecraft Reflector
> Subject: Re: [Elecraft] RX Test (long)
> 
> 
> So what you are saying is the K3 is too quiet for its own 
> good, and that's what makes it so noisy!
> 
> 
> 
> ----- Original Message ----
> From: "Joe Subich, W4TV" <lists at subich.com>
> To: don at w3fpr.com; Al Lorona <alorona at sbcglobal.net>
> Cc: Elecraft Reflector <elecraft at mailman.qth.net>
> Sent: Fri, January 8, 2010 8:46:21 PM
> Subject: RE: [Elecraft] RX Test (long)
> 
> 
> 
> 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.