[Elecraft] [K3} fatiguing auido, high noise environment

[Erik N Basilier]

Doug,

I find the DSP NR to be quite effective even with a 200 Hz roof and
100 Hz DSP. No specific experience with impulse noise and NR only (if I have 
impulse noise, I turn on the NB).
Running 2.67 with default AGC settings.

That said, I agree that it is useful to be able to change roofing filter 
without having the DSP width follow.
The K3 utility is a clumsy way to do it. I would rather have the XFIL button 
not affect DSP width.

73,
Erik K7TV

----- Original Message ----- 
From: "GM0ELP" <douglas.maxwell at virgin.net>
To: <elecraft at mailman.qth.net>
Sent: Saturday, December 13, 2008 5:02 AM
Subject: Re: [Elecraft] [K3} fatiguing auido, high noise environment


>
> I have found that having roofing filters automatically track the DSP 
> filter
> width is a bad idea in a noisy environment. My noise was best tackled with
> the DSP NB rather than the hardware NB (ie. DSP NB 3-7, IF OFF).
>
> The DSP NB still worked with a 1KHz roofing filter in line, but if a
> narrower roofing filter was selected (400Hz) as a result of reducing the 
> DSP
> filter width, the DSP NB action vanished, and I was left with the same
> horrible audio as you are describing.
>
> I don't understand the full picture yet, but, DSP NB and NR need a wide
> roofing filter width (>= 1KHz) to work effectively. However, any narrow 
> DSP
> filter width (as long as a wide roofing filter was selected) would still
> still allow DSP NB and NR to work effectively (ie. roofing filter 1KHz, 
> dsp
> filter 200Hz). The automatic selection of roofing filters makes this
> combination and many others impossible to select (e.g. if you have a 400Hz
> roofing filter installed) without messing about with the Elecraft Utility
> software and disabling filters.
>
> My previous post suggested having a menu item that would allow the
> automatic/manual selection of roofing filters (defaulted to Automatic) to
> allow for better handling of selectivity in noisy situations.
>
> Doug GM0ELP
>
> -- 
> View this message in context: 
> http://n2.nabble.com/-K3%7D-fatiguing-auido%2C-high-noise-environment-tp1650872p1651490.html
> Sent from the Elecraft mailing list archive at Nabble.com.
>
> _______________________________________________
> Elecraft mailing list
> Post to: Elecraft at mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>