[Elecraft] [K3] Noise Reduction Recording

[David Ferrington, M0XDF]

Yes thanks Tom, a lot of people have said that its not that bad - I guess I
want it to be silent when there isn't anyone on the other end :)

I found some real noise on 6m and the NB cut that out a treat, so alls well.


On 25/02/2008 14:56, "Tom Hammond" <n0ss at embarqmail.com> sent:

> Hi David:
> 
> I hear NO NOISE (at all) on any of your recordings!
> 
> Well... what 'noise' I do hear is (to me anyway) 'band noise'... atmospheric
> noise and not electro-mechanical noises such as would normally be classified
> as 'line noise' or man-made. This actually a pretty good demonstration is a
> nice, CLEAR 75-meter band... I certainly wish I had MY 80/75 m band noise to
> be THAT low level all of the time.
> 
> The BACKGROUND (band noise) which you hear on this band is NORMAL and should
> not be considered to be unusual. And there is NO noise blanker of which I am
> aware that will remove what you recorded. However, enabling the [NR], Noise
> Reduction feature of the K3 will help to significantly REDUCE the level of
> the background noise, albeit lending a slightly 'watery' sound to the real
> received signal... we seldom get something for nothing these days.
> 
> 73,
> 
> Tom Hammond   N0SS
> 
> At 02:47 02/25/2008, David Ferrington, M0XDF wrote:
>> I'm still having trouble determining if what I hear is noise that NB should
>> get rid of. This is because I'm a relatively new Ham without the experience
>> to know what I'm hearing.
>> 
>> So I have made a recording on the noise and it is available from
>> <http://homepage.mac.com/davidferrington/FileSharing2.html>
>> 
>> I have recorded 3.740MHz in 5 second tracks with a tone between each change
>> of NR setting, viz:
>>     5 seconds of no NR, 200mS tone @ 700Hz
>>     5 seconds of NR F1-1, 100mS tone at 1400Hz
>>     5 seconds of NR F1-2, 100mS tone at 1400Hz
>>     5 seconds of NR F1-3, 100mS tone at 1400Hz
>>     5 seconds of NR F1-4, 200mS tone at 700Hz
>>     5 seconds of NR F2-1, 100mS tone at 1400Hz
>>     etc.
>> 
>> I have found no NB setting that affects this, I can possibly hear a very
>> slight change, but it does not cancel the noise.
>> I can do the same for the NB settings if people wish.
>> 
>> I would appreciate some feedback on this please, is this just broadband hash
>> in my urban neighbourhood from er, broadband and wall warts etc?
>> 
>> Mail me off list if you'd like me to mail you a copy of the file direct.
>> 
>> 73 de M0XDF / K3 #174
>> 
>> --
>> Why should I fear death? If I am, death is not. If death is, I am not. Why
>> should I fear that which cannot exist when I do?
>> -Epicurus, philosopher (c. 341-270 BCE)
>> 
>> 
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-- 
It is unwise to be too sure of one's own wisdom. It is healthy to be
reminded that the strongest might weaken and the wisest might err.
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