K3 NR in Ver 3.27

[Barry Simpson]

I have just installed 3.27 and the NR is a disaster. On turning it on there
is virtually no AF output even at maximum AF gain setting. I have turned the
K3 off and on but to no avail.

 

Also there are big birdies on 40m (I haven't checked any other bands) which
I am sure were not there before I upgraded from 3.25.

 

Has anyone any ideas . If not it looks as if I will need to go back to 3.25.

 

Barry  VK2BJ

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[Ian Maude]

Do you have any RX EQ on?  Is this CW or SSB?  What bandwidth are you  
operating at?  Have you tried with AFX on and off?  Plenty of audio  
here.

73 Ian

On 27 Aug 2009, at 27August13:00, Barry Simpson wrote:

> I have just installed 3.27 and the NR is a disaster. On turning it  
> on there
> is virtually no AF output even at maximum AF gain setting. I have  
> turned the
> K3 off and on but to no avail.
>
>
>
> Also there are big birdies on 40m (I haven't checked any other  
> bands) which
> I am sure were not there before I upgraded from 3.25.
>
>
>
> Has anyone any ideas . If not it looks as if I will need to go back  
> to 3.25.
>
>
>
> Barry  VK2BJ
>
> ______________________________________________________________
> 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

--
Ian J Maude, G0VGS
SysOp GB7MBC & HB9DRV-9 DX Clusters
Member RSGB, GQRP 9838, FISTS 14077 | K3 #455
http://www.amateurradiotraining.org

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[KK7P]

> I have just installed 3.27 and the NR is a disaster. On turning it on there
> is virtually no AF output even at maximum AF gain setting. I have turned the
> K3 off and on but to no avail.

Were you tuned to a signal at the time, or just band noise?  If just
noise, then the NR was doing its job.

Please start with setting F1-1.  This is the lightest NR action.

73,

Lyle KK7P

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[Van W1WCG]

I operate a lot on CW nets, with the b/w set to 700Hz, no EQ, AFX on,
and use the NR to increase the apparent S/N ratio, and also to soften
the effect of band noise on the ears.  Before v3.25, this was
frustrating because the NR took appreciable time to build the filter,
and appeared to do so on each code element; the overall effect was to
make the code sound "mushy" and harder to copy.

Then v3.25 came along, and it made a big improvement.  The mushiness was
gone and by experimenting with the various settings, I could find a
"sweet point" where the filters were not too aggressive and yet an
appreciable improvement in copy was obtained.  With v3.27, the filtering
became even more focussed and this morning I used a 3-3 setting to pull
weaker stations out of the noise on 40m, which was having one of it's
less stellar days.  I think the guys at Aptos are definitely going in
the right direction, especially for the CW side of things.  I've tried
the NR on a couple of SSB nets, but there the improvement was less easy
to pick out -- though I think it IS an improvement when you find the
correct setting.

Not a scientific review, just very subjective $.02 worth.

73, Van W1WCG

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