I saved this gem of a post from Jack WA9FVP
====
Re: [Elecraft] [K3]Noise Filter (NF) ADJ
wa9fvp Thu, 27 Dec 2012 16:19:36 -0800
There's no documentation but as far as I can tell--
F1-x through F4-x defines the amount of noise reduction or how aggressive
the filter attacks the I.F. noise. F5-X through F8-X defines the amount of
reduction and the level that's mixed with the filtered and non-filtered
I.F.
Note that "m" which means "mix" will appear after F5-X and above.
X defines the delay. Delay is the amount of time it takes for the filter to
converge on a non-sinusoidal signal or the noise. The higher the number,
the longer it takes for the noise to reduce to a low level.
I hope this helps.
Jack WA9FVP
F1-x through F4-x are for CW
F5-x through F8-x are for SSB
====
On 3/10/2014 12:06 PM, Andreas Hofmann wrote:
Hi,
I put together my new K3 without any issues. My 8 and 10 year old daughters
helped and they really enjoyed it too. Overall I am very happy with its
performance. I do not seem to need PRE on the high bands as much, but I do
seem to need ATT on the low bands more... I guess that is by design. I have a
few things I need to figure out and the manual does not seem to help:
1. DUAL PB, APF. I am not sure I get the APF to work. I do not hear or
see the middle peak of the filter. I think I only get DUAL PB, no matter what I
set in the config menu. I am using the latest FW. Any ideas how to verify?
2. NR: I like how the noise goes away, but I do not like the
under-the-water sound (K2 owner, no DSP experience). I seem to switch
constantly back and forth... I am using the default setting for NR (F1-1). Is
there a way to back off the setting slightly to have a better compromise
setting?
3. KPA3 temp: The fans are MUCH quieter as my K2's which is good, but I
do worry that I have not setup something right...When I monitor the KPA3
temperature, what is the max value that I should watch out for? I am getting up
to 41 C during casual operation.
Thanks in advance and 73,
Andy
KU7T
--
GB & 73
K5OAI
Sam Morgan
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