[Elecraft] 756PRO filters v. K2

Thu Nov 28 09:21:00 2002

Hi Wim,

Thanks, I've tried that in the past, and you are right, the clicking and
ringing is much less, but you hear more adjacent signals.  In fact, I have
one of my CW filters set for 600 Hz (outside the BPF range) that I then
narrow with the filter stop controls.  However, using the filters without
the BPF lets much more adjacent signal through, even when set to a very
narrow bandwidth.  The shape factor for the K2 filter is much closer to that
of the BPF filter than to the non-BPF filter for a given bandwidth setting.
But the K2 doesn't experience the clicks and pops.  Take a look with
Spectrogram and you'll see what I mean about the shapes.  The BPF filter is
extremely sharp, so you pay the price with clicks and pops.  The non-BPF
filter isn't sharp enough, so you pay the price with adjacent signal
leakage.  The K2 filter seems to be set just right to deliver excellent
sounding, narrow CW.

73,

Rich W1EZ
----- Original Message -----
From: "SP5DDJ" <[email protected]>
To: "Smith" <[email protected]>; <[email protected]>
Sent: Wednesday, November 27, 2002 23:00
Subject: Re: [Elecraft] CQWW CW WOW!

> IC756 PRO will have nice CW tune if you set in CW mode 1,2k filter in SSB
> mode and turn PBT to "squeeze" down to required bandwidth. Filter shape is
> less narrow then and  there is no ringing effect. Green BPF must be off.
> Manual says nothing . Deatails can be found on
>
www.seed-solutions.com/gregordy/Amateur%20Radio/Experimentation/CWFilter.htm
> l . There is no comparison when you try this.
>
> Regards &72'ss
>
> Wim SP5DDJ
>
> K1 #1089
> K2 #?????
>
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