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" <[email protected]>
To: <[email protected]>
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
--
://www.elecraft.com
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