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

[Alexandr Kobranov]

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
>>
>> -- 
>> 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.
>>
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