[Elecraft] K3 Narrow CW Filter

GW0ETF gw0etf at btinternet.com
Mon Feb 2 11:13:35 EST 2009



John Huffman-3 wrote:
> 
> I'm getting used to my new K3, but have a question. 
> 
> My K3 has the 400hz 8-pole filter and the latest firmware.  I've noticed 
> that the difference between running the DSP filter at 100hz and 150hz is 
> greatly increased volume at 150hz.  With the NR on (F2-4) easy listening 
> at 100hz will bow your ears out at 150hz.  Is this just me?  I run AF 
> gain at 9 o'clock and RF gain at 12 o'clock.
> 
> 

John,

I had the following from Vic K2VCO in response to a post by me about Noise
Reduction and RX Equalisation settings - I had it boosted at the cw sidetone
frequency to give an accentuated effect with NR but found my audio dropped
when I reduced the b/w beyond the 150 Hz point. So you may want to
check/play with your RX Eq settings....

""This is not the best approach because of the following: when the 50 and
100 Hz DSP filters are enabled the RX EQ is disabled (I forgot the
reason for this, but Lyle explained it to me). So the effect of
narrowing the bandwidth is that the signal suddenly drops several dB!

If you want to use the RX EQ for this the best way to do it is to leave
the desired bands at 0 dB and *reduce* all others by the amount of
'boost' that you prefer.
-- 
73,
Vic, K2VCO ""

All this cross referencing of previous posts would be so much easier if each
post was numbered as on some other reflectors.....

73,

Stewart Rolfe, GW0ETF
-- 
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