[Elecraft] K3S speaker vibration/whine

ae4pb at carolinaheli.com ae4pb at carolinaheli.com
Thu Oct 22 15:31:40 EDT 2015


Will do, I usually operate with headphones and just crank the RF gain down
as needed. That + NR + APF + width really rocks signals down to nearly
nothing unless they are really weak. Then it's a matter of playing with the
settings. I'm finding a need to play with the AGC on some signals where with
others it needs to be engaged more. I'm enjoying the process of learning to
really use it. 

Jerry Moore
CDXA, INDEXA, SKCC, Fists
AE4PB, K3S - S.N. 010324
http://www.qrz.com/db/AE4PB
An Amateur is - Considerate, Loyal, Progressive, Friendly, Balanced, and
Patriotic.


-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Mike
K2MK
Sent: Thursday, October 22, 2015 3:06 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3S speaker vibration/whine

Hi Jerry,

You should also try with APF off. APF on the K3 is useful for pulling out
weak signals. I don't see the benefit for general listening. 

Just as a further clarification. Generally, if your bandwidth is dialed in
as 500Hz then your 400Hz filter has been switched out and your current
roofing filter is the next wider one. I say generally because it is possible
to set wider cutoff points for the roofing filters.

73,
Mike K2MK


ae4pb wrote
> I normally wear a headset but when working I like to listen to code to 
> help build my proficiency and am hearing a lot of 
> distortion/buzz/whine. I typically am on 40M running about 500Hz wide 
> (my filter is the 8 pole 400Hz), NR is ON, APF is ON. I've tried 
> changing the tone from 700Hz to down around 400Hz and the issue just 
> gets worse.
> 
> The speaker is tight against the mesh/top cover so I'm not sure why 
> the sound is so buzzy. I don't notice it on SSB. I end up turning the 
> volume WAY DOWN which makes it better but still some buzz in there. I 
> plan to wire up some old surround sound speakers up for stereo and try 
> that but am trying to figure out what I did wrong in the meantime.
> 
> Thanks in advance. 





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