[Elecraft] K3 - Filter suggestions for new builder

[Gary Gregory]

*Al,

whilst your statements hold true for you, I DO use the 1.8Khz almost as my
default. Attention paid to Hi/Lo gives me nice intelligibility and if you
were listening to 3D2C last night on 20M and witnessed the deplorable
behavior of stations deliberately providing QRM on their call frequency you
have not been impressed.

I ran at 1.8Khz, tightened it up some more with Hi/LO, watched on the P3
and pounced, got'em, no problem. ( I see the on-line log does not show my
success as yet)

Whilst I have absolutely no idea why 3D2C generated so much qrm against
them, I can only say it was a sad day and the operators I heard (2) running
3D2C were great to listen to.

73



*
On 27 September 2012 11:06, Al Lorona <alorona at sbcglobal.net> wrote:

> Right, Don!
>
> I still believe that many K3 users are under the erroneous impression that
> the
> roofing filter determines the receiver bandwidth. It does not. The HI and
> LO
> knobs do.
>
> The only thing the roofing filter does is determine the MAXIMUM possible
> bandwidth of the receiver.
>
> In 99% of cases, an SSB roofing filter is good enough. (That statement is
> going
> to draw some fire.)
>
> It's a little bit like this: the roofing filter is like the credit limit
> on your
> Visa card. You can't go any higher than that. But in any typical month, you
> spend far less than that... and on the K3 the amount you *actually* spend
> is set
> by the HI and LO cut controls.
>
> This is why I advised the original poster: you wanna know what 1.8 kHz
> sounds
> like? Set your HI LO controls to a bandwidth of 1.8 kHz. Then decide
> whether it
> 1/ is tolerable; and 2/ increases intelligibility enough to make the
> investment
> worth it. I happen to think that 1.8 kHz is too narrow. But that's just me.
>
> ________________________________
>
> I say that because in all cases with the K3, it is the DSP that
> determines the filter width rather than the roofing filter.  What I am
> saying is that even if you put in a 1.8k filter, SSB at a 1.8k width
> will sound the same as it does right now using only the DSP.
>
>
> 73,
> Don W3FPR
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-- 
*Gary*
*Start the day off slow, then taper off.........*
K3 #679
KPA500FT #18
KAT500FT 007
P3 #1629