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SN#1196 K3 General coverage

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Ed Gray W0SD

SN#1196 K3 General coverage

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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Bill Maddock-2

Re: SN#1196 K3 General coverage

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 <[hidden email]> wrote:

> From: Ed Gray W0SD <[hidden email]>
> Subject: [Elecraft] SN#1196 K3 General coverage
> To: [hidden email]
> 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
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

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Ed Gray W0SD

Re: SN#1196 K3 General coverage

I am not into listening to short wave much or AM radio but I wanted it
for getting news/WX when traveling on a DX-pedition and for an
occasional basket ball game I like to listen to from the home QRH on a
distant AM station that takes my antenna farm to drag in.

If I add the AM 6 khz filter I will be up to $130 + $125 = $255 to do
that so I am going to try and get by with the 2.8 khz since I have zero
interest in transmitting AM. In Australia it was a big deal to listen
to there HF radio WX frequencies when we were mobile as it was still
hurricane season and we put in a long day of travel to get by a
hurricane which is a good thing to do if you have good info and a stupid
thing to do it you are not keeping constant tabs. In Australia you
don't turn inland on any kind of Oil road many places.

Ed W0SD

Bill Maddock wrote:

> 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!
>
>

Joe Subich, W4TV-3

RE: SN#1196 K3 General coverage

Ed,

> I am not into listening to short wave much or AM radio but I
> wanted it for getting news/WX when traveling on a DX-pedition
> and for an occasional basket ball game I like to listen to
> from the home QRH on a distant AM station that takes my antenna
> farm to drag in.

For non-critical AM listening it is certainly possible to use
the 2.7 KHz roofing filter - particularly if you do not have
either the 13 KHz (FM) or 6 KHz (AM) filter. As a test I
disabled my FM filter and using the 2.8 KHz filter with the
DSP set to 6 KHz, I get perfectly acceptable performance on
the MW band - particularly if I tune 1.3 - 1.4 KHz high/low
for "single sideband, full carrier" detection. Music certainly
is not as "bright" as it is with the 13 KHz filter but it is
not bad enough to send me screaming from the room. Voice
performance/quality (e.g., a ball game) is quite satisfactory
(at least as good as a common "table radio").

73,

... Joe, W4TV

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Ed Gray W0SD
> Sent: Monday, July 14, 2008 7:54 PM
> To: [hidden email]
> Cc: [hidden email]
> Subject: Re: [Elecraft] SN#1196 K3 General coverage
>
>
> I am not into listening to short wave much or AM radio but I
> wanted it
> for getting news/WX when traveling on a DX-pedition and for an
> occasional basket ball game I like to listen to from the home
> QRH on a
> distant AM station that takes my antenna farm to drag in.
>
> If I add the AM 6 khz filter I will be up to $130 + $125 = $255 to do
> that so I am going to try and get by with the 2.8 khz since I
> have zero
> interest in transmitting AM. In Australia it was a big deal
> to listen
> to there HF radio WX frequencies when we were mobile as it was still
> hurricane season and we put in a long day of travel to get by a
> hurricane which is a good thing to do if you have good info
> and a stupid
> thing to do it you are not keeping constant tabs. In Australia you
> don't turn inland on any kind of Oil road many places.
>
> Ed W0SD
>