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NR and Audio increase

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Merv Schweigert

NR and Audio increase

The post from BA4RF etc about the NR causing the audio to blast,

I mentioned I do not work SSB but tried went to SSB and confirmed
the increase in audio,
well its on all modes as far as I can tell, to be more truthfull I do
not use
NR as I find it to non effective to CW work at least the for what I want,

If you have a decent signal strength CW signal tuned to the pitch setting
and hit NR with a setting of 4 the audio increases dramatically, I
tried it
also listening to AM broad cast on 40 meters and had the same increase.

So unless its my radio only again the NR function is not working on all
modes as of the last couple updates. AGC updates effected the NR
in some fashion? I did not try changing any of the AGC settings to see
if they made any difference.
73 Merv KH7C
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n7ws

Re: NR and Audio increase

I can almost guarantee this is going to be another one of those, "My radio doesn't act like that threads."

The reason being, this phenomenon is level sensitive. With a weak signal the noise reduction lowers the signal strength but above a certain level, it increases the signal dramatically.

With a -110 dBm signal (1000 Hz beat note) turning on NR (F1-1) reduces the audio signal 6 dB.

At -100 dBm input, NR *increases* the signal 11 dB. At -90 dBm it's up 16 dB.

Wes N7WS

--- On Wed, 4/8/09, Merv Schweigert <[hidden email]> wrote:

> From: Merv Schweigert <[hidden email]>

> The post from BA4RF etc about the NR causing the audio to
> blast,
>
> I mentioned I do not work SSB but tried went to SSB and
> confirmed
> the increase in audio,
> well its on all modes as far as I can tell, to be more
> truthfull I do
> not use
> NR as I find it to non effective to CW work at least the
> for what I want,
>
> If you have a decent signal strength CW signal tuned to the
> pitch setting
> and hit NR with a setting of 4 the audio increases
> dramatically, I
> tried it
> also listening to AM broad cast on 40 meters and had the
> same increase.
>
> So unless its my radio only again the NR function is not
> working on all
> modes as of the last couple updates. AGC updates effected
> the NR
> in some fashion? I did not try changing any of the AGC
> settings to see
> if they made any difference.
> 73 Merv KH7C

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Elecraft mailing list
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Help: http://mailman.qth.net/mmfaq.htm
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Alexandr Kobranov

Re: NR and Audio increase

Hi Wes,
are you talking about situation when RX EQ is FLAT?
Did you tra some EQ settings and what is as result?

Thanks,
73!
Lexa, OK1DST

Wes Stewart napsal(a):

> I can almost guarantee this is going to be another one of those, "My radio doesn't act like that threads."
>
> The reason being, this phenomenon is level sensitive. With a weak signal the noise reduction lowers the signal strength but above a certain level, it increases the signal dramatically.
>
> With a -110 dBm signal (1000 Hz beat note) turning on NR (F1-1) reduces the audio signal 6 dB.
>
> At -100 dBm input, NR *increases* the signal 11 dB. At -90 dBm it's up 16 dB.
>
> Wes N7WS
>
>
> --- On Wed, 4/8/09, Merv Schweigert <[hidden email]> wrote:
>
>> From: Merv Schweigert <[hidden email]>
>
>> The post from BA4RF etc about the NR causing the audio to
>> blast,
>>
>> I mentioned I do not work SSB but tried went to SSB and
>> confirmed
>> the increase in audio,
>> well its on all modes as far as I can tell, to be more
>> truthfull I do
>> not use
>> NR as I find it to non effective to CW work at least the
>> for what I want,
>>
>> If you have a decent signal strength CW signal tuned to the
>> pitch setting
>> and hit NR with a setting of 4 the audio increases
>> dramatically, I
>> tried it
>> also listening to AM broad cast on 40 meters and had the
>> same increase.
>>
>> So unless its my radio only again the NR function is not
>> working on all
>> modes as of the last couple updates. AGC updates effected
>> the NR
>> in some fashion? I did not try changing any of the AGC
>> settings to see
>> if they made any difference.
>> 73 Merv KH7C
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
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>
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> Please help support this email list: http://www.qsl.net/donate.html
>