Re: dynamic range question

[Phillip Nichols]

Would this work in reducing the effects of my notebooks noisy
power-supply.? I can not use my 817 at all on 20m unless I unplug my
Notebook.

73/Phillip/N8AYE
-.  ---..  .-  -.--  .


Jim Brown said the following on 12/30/2011 4:03 PM:
>
> In very simple terms, it means that when a very strong signal is very
> close in frequency to another much weaker signal that you want to
> listen to, the KX3 can reject a signal that is 30dB stronger than the
> 817 can reject.  Putting it another way, on the 817, the stronger
> signal would take over, and you wouldn't hear the weaker one, but the
> KX3 would pull it through.

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[Jim Brown-10]

On 12/30/2011 1:26 PM, Phillip Nichols wrote:
> Would this work in reducing the effects of my notebooks noisy
> power-supply.? I can not use my 817 at all on 20m unless I unplug my
> Notebook.

Not at all.  You must kill the noise that the power supply generates. See

http://audiosystemsgroup.com/RFI-Ham.pdf

for guidance.

73, Jim K9YC
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[wayne burdick]

This is just an issue of your notebook emitting a lot of RF in the ham  
bands; it isn't a strong enough signal to bring dynamic range into play.

The KX3 has DSP-based noise blanking and noise reduction, so it should  
do a better job on all types of noise than the '817.

73,
Wayne
N6KR


On Dec 30, 2011, at 1:26 PM, Phillip Nichols wrote:

> Would this work in reducing the effects of my notebooks noisy
> power-supply.? I can not use my 817 at all on 20m unless I unplug my
> Notebook.
>
> 73/Phillip/N8AYE
> -.  ---..  .-  -.--  .
>
>
> Jim Brown said the following on 12/30/2011 4:03 PM:
>>
>> In very simple terms, it means that when a very strong signal is very
>> close in frequency to another much weaker signal that you want to
>> listen to, the KX3 can reject a signal that is 30dB stronger than the
>> 817 can reject.  Putting it another way, on the 817, the stronger
>> signal would take over, and you wouldn't hear the weaker one, but the
>> KX3 would pull it through.
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

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