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

[Leigh L. Klotz, Jr WA5ZNU]

Or possibly there could be an NR option to have it switch to a wider 
xtal filter when NR is on, if this turns out to be valuable.
Then the wider xtal filter wouldn't be used unless needed.
Leigh/WA5ZNU
> It seems to be nice future option to have roofing filters switched 
> only by XFIL button and DSP control by WIDTH only - both independent 
> for such experimental usage...
> :-)
> 73!
> Lexa, OK1DST
> K3/10 #727
>
>
> Erik N Basilier napsal(a):
>> 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
>>>
>>> -- 
>>>
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