[Elecraft] K3 Cw Filter Choices

[Matt Murphy]

I recommend the 1KHz over the 400Hz filter (if you're going to get one
filter) b/c without it you get a lot more IMD when you set the DSP width
anywhere above 400Hz.  In a contest during a run I like to set the DSP
bandwidth to 600-800Hz.  If someone is closer than 300-400Hz +- from my
frequency, I want to know about it since not all contest participants are
using K3s and I don't think it's safe to assume that all would-be calling
stations will be able to copy me if the station 350Hz away is very loud and
I'm not.

Since the output of the roofing filter is the input to the DSP, the DSP is
able to do a much better job at 500Hz if you have the 1KHz roofing filter
installed than if you just have a 2.x KHz filter installed.

Ideally you'd have one narrow roofing filter as well, but unless you
anticipate doing most of your operating with the width set to less than or
equal to 400Hz, I think your overall experience will be better with the
1KHz roofing filter + DSP.

On Thu, Dec 15, 2011 at 10:02 AM, Dave Hachadorian <k6ll at arrl.net> wrote:

> I like the 250, which is actually 370.  I told the K3 it was 400,
> so the filter is switched in at DSP BW 400.  It works great on CW
> and is perfect for RTTY.
>
> The 400 is another good choice. It is actually 435, so there's
> not much difference between 370 and 435.
>
>
> Dave Hachadorian, K6LL
> Yuma, AZ
>
>
>
> -----Original Message-----
> From: pastormg2 at verizon.net
> Sent: Thursday, December 15, 2011 9:17 AM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] K3 Cw Filter Choices
>
> Good Morning, when I initially purchased the K3 I only had SSB
> filters put into the radio.  Which is currently the 2.7 and 1.8.
> Would like to get back into CW and I was wondering which CW
> filter would be good for that purpose. Any help would be much
> appreciated.  Thanks!!  Mark KB3Z
>
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