[Elecraft] K3 Hissy and Noisy Audio

[Joe Subich, W4TV]

> Perhaps NR could also be improved with more low 
> frequencies in the passband.

Please NO!  I already run RX Audio bands 1 and 2 at -16 dB to 
eliminate excessive bass - no more bass, please! 

The hiss many seem to be complaining about is broadband noise 
in the audio (speaker) and/or headphone amplifier.  It is more 
noticeable when driving low impedance loads (8/16 Ohm) due to 
the relatively high gain (14 dB) of the speaker amplifier 
and the high frequency boosting effect of the 33 pF capacitors 
in  parallel with the gain setting (feedback resistors).  

73, 

   ... Joe, W4TV 
 



> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Roy Morris
> Sent: Monday, April 06, 2009 2:01 PM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] K3 Hissy and Noisy Audio
> 
> 
> I concur with what has been said regarding the "hissy" audio. 
>  The receiver audio seems to be on the mid-range to high 
> frequency side without enough low frequencies in the 
> passband.  Experiments with RX EQ apparently have not done 
> anything to eliminate this hiss, but maybe the firmware can 
> be adjusted to increase the low-end response of the receiver 
> passband.  If this doesn't work, maybe a component change is in order.
> 
> I also think the noise reduction is too sharp in both SSB and 
> CW.  Perhaps NR could also be improved with more low 
> frequencies in the passband.
> 
> Roy Morris  W4WFB    
> K2 #2225    
> K3 #323
> K3 #2810 
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