Ed,
I have the shortwave board in my K3 - the 2.8 khz would definitely
be too narrow - I run a 6 hhz and it is still pretty narrow - The FM
12 khz would be best for fidelity if that is what you want - I have
noticed with the 6 khz roofer in AM the DSP goes out to 10 khz! Both my 850s
have 15 khz wide roofers and 12khz IF for AM and they sound superb!
The 6 khz is very satisfactory for listening to voice, but tight on music!
I would love to get a second K3 and may if things look good later
this fall!
73 and Good Contesting!
Bill N4ZI Munford, TN www.n4zi.net/Home.htm
--- On Mon, 7/14/08, Ed Gray W0SD <[EMAIL PROTECTED]> wrote:
> From: Ed Gray W0SD <[EMAIL PROTECTED]>
> Subject: [Elecraft] SN#1196 K3 General coverage
> To: elecraft@mailman.qth.net
> Date: Monday, July 14, 2008, 6:17 PM
> After using #1037 this past week end, last night I started
> putting
> together #1196 which came right after I got back from TO5E
> and I was
> getting ready for the IARU contest so there just was no
> time. The
> second one certainly is easier than the first. Things went
> well and I
> did add the General Coverage option.
>
> This brings up some questions about the General Coverage
> option? I
> confess to not knowing much about AM. The latest I read is
> if you are
> in AM mode with a 2.8khz 5 pole filter in FL1 if I hold
> down the knob
> for normal I would get 2.8 khz but instead I get 6.0
> khz???? I can
> expand it to 10 khz. I am "hazy" in my thinking
> on the effect the 2.8
> roofing filter is having here. I can hear "no"
> difference to my ear
> between 6.0 and 10 khz so I assume the roofing filter is
> having its
> effect. However at 5.0 khz with the DSP I can definitely
> hear less
> fidelity and at 4.0 khz it does not sound very good. I
> suspect that the
> signal is strong enough so it is working beyond the width
> of the roofing
> filter.
>
> In SSB the norm takes me to 2.7 khz and I can use the DSP
> out to 4.0 khz
> but I can hear no difference in fidelity. It sounds the
> best at 2.7 khz
> and of course less fidelity as I narrow it down. This I
> guess is because
> I am just listening to one side of the AM signal.
>
> Has there been some changes in the firmware that I
> don't see anything
> written up on. I will have to say that on Short Wave and
> also AM
> broadcast it sounds very good in AM at 6.0 khz with the
> DSP.
>
> Ed W0SD
>
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