[Elecraft] K3 Hissy and Noisy Audio

[Jay Bromley]

Hi Joe,
Looking at Spectra right out of the Phones output, I don't see where bands 
1or 2 do all that much in lowering K3's bass.

Having the rig on SSB using the 2.7 Khz filter, the "Lo" on 0, I see no 
change on bands 1 and 2 when I set them to -16.  What I am missing here?  I 
have never seen or heard too much bass in the K3.

I did a plot at 0 dB, one at -16 on band 1 and another one on -16 on band 2 
if anyone would like to see them.

73 de w5jay/jay..



>
>> 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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