[Elecraft] K3 receiver noise questionable test results

[Hector Padron]

If this help others to improve their receivers I am going to share here all my settings.
My K3 # 2192 is very quite,let say first that over my home at 40 feet is running a Florida Power and Light 33KV line and I have around my K3 three computers running all the time,nevertheless I have very low noise in the receiver,its completeley clean,so I have it set this way:
AGC DCY.....SOFT
AGC HLD     0.20
AGC PLS     nor
AGC SLP     015
AGC THR     005
AGC-F         150
AGC-S         020
FL2 BW       2.8
FL2 FRQ      0.00
FL2 GN        0
FW             3.63
RX EQ :
50Hz           +12
100Hz         +8
200Hz         +2
400Hz          0
800Hz          0
1600Hz        0
2400            0
3200          --16 (minus)
My DSP board was mod by Elecraft with the W9AC hardware changes for wider audio bandwith.With all these settings my working RX bandwith is from 60 to 2700Hz.
I normally use the AGC always in ON at the slow position,the Audio vol control at 50% and the RF gain control at 50% or less just what needed to pull the station clear.
I can share MP3 files with anyone interested to hear how quite is my receiver.
This discussion about K3 noisy receivers is been very positive because we have all learned more about our radio and we can share each other better settings to improve the receiver noise level.Nobody should be stoped to writte their opinion.Certainly the complainers are very few compared with the thousand of happy K3 owners who are pretty satisfied with the receiver but everybody has the right to say what they feel.
My two cents.
Merry xmas for all and hoping the new year will bring us more happiness,health and luck.
 
AD4C
 


"For a refined ham it is compulsory to own a k3"

--- On Sat, 12/19/09, Al Lorona <alorona at sbcglobal.net> wrote:


From: Al Lorona <alorona at sbcglobal.net>
Subject: Re: [Elecraft] K3 receiver noise questionable test results
To: 
Cc: elecraft at mailman.qth.net
Date: Saturday, December 19, 2009, 6:40 AM


> But a few of the K3 owners that have pro-audio 
> instrumentation have reported that the K3 audio 
> response is more like 'white noise' (a flat response), 
>as opposed to other receivers which have a 'pink 
> noise' audio spectrum.

If that's the case, then the K3's receiver equalizer can be set up to mimic a pink rolloff which is -3 dB per octave. 

50 Hz    :    + 9 dB
100    :    + 6
200    :    + 3 
400    :    0
800    :    - 3
1600    :    - 6
3200    :    - 9

or if 3 dB per octave is a little severe, then one could try 2 dB per. 

This is awfully conjectural until we can quantify exactly what it is that a Yaesu FT-1000 has that a K3 doesn't.

One of the guys at work has pasted on his cubicle wall that famous quote of Lord Kelvin that I believe applies here: 
When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge of it is of a meager and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely, in your thoughts, advanced it to the stage of science.
Sir William Thompson, Lord Kelvin (1824-1907) 
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