[Elecraft] K3 NR triggering

[Steve Ellington]

Lyle:
Maybe a quick lesson on proper use of the NR filter would help us. Thinks 
like....If F1-1 doesn't work, do we go to F1-2 or F2-1 or should we skip a 
few F's. Should we turn NR off then back on every time we make a change? 
Does changing NR settings while receiving a cw signal matter or should one 
change settings with no signal?
I guess I got spoiled by the IC-7800's NR. With it, you just turn it on and 
the noise disappeared.
Steve
N4LQ
N4LQ at carolina.rr.com
----- Original Message ----- 
From: "Lyle Johnson" <kk7p at wavecable.com>
To: "Craig" <vk3he at yahoo.com>
Cc: <elecraft at mailman.qth.net>
Sent: Thursday, August 27, 2009 9:10 AM
Subject: Re: [Elecraft] K3 NR triggering


>> I also  seem to get the impression that the selected NR setting is not 
>> exacty the same as the selected  level within in the menu versus turning 
>> the DSP  NR on and off without entering the menu,  if that makes sense.
>
>
> The NR is an adaptive filter.  When you turn it off, it is completely
> reset: all buffers are flushed and filter coefficients zeroed.
>
> When you move from setting to setting with the NR adjust feature, the
> buffers are not flushed nor are the coefficients reset.  Instead, the
> new settings are applied to the current state of the filter.  So, it
> takes from a few tens of milliseconds to perhaps a couple of seconds for
> the filter to adapt to the new settings.
>
> 73,
>
> Lyle KK7P
>
>
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