[K3] DSP noise remover?

[Thomas Horsten]

MFJ makes something called the MFJ 1026 noise remover, that allegedly can
remove or reduce QRM from a specific source by phase shifting and mixing
the signals from your main antenna and an extra receive antenna. Details
here: http://www.eham.net/reviews/detail/1205

I wonder if the K3 with the subreceiver could be made to do something
similar, the architecture would probably not allow it because the DSP from
the subreceiver and the main receiver aren't connected, but it would sure
be a great thing to have.

At my QTH we suffer from daily QRM on 40m, which starts around 2000z and is
usually gone by 2315z, putting S7 noise all over the 40m band, I haven't
been able to track it down yet but myself and several other hams are
looking at it (it's affecting an area of many square miles, including the
entire area surrounding Cambridge).

If there was a way to do something similar directly in the K3, perhaps with
a new add-on module, that would be fantastic. I realize the chances are
slim, but here's throwing the idea into the air!

73, Thomas M0TRN
(K3 #4208, KX3 on order)
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[Bob K6UJ]

Regarding the MFJ-1026, it works quite well if your noise is coming basically from one direction.  


Bob
K6UJ




On Jan 20, 2012, at 4:47 PM, Thomas Horsten wrote:

> MFJ makes something called the MFJ 1026 noise remover, that allegedly can
> remove or reduce QRM from a specific source by phase shifting and mixing
> the signals from your main antenna and an extra receive antenna. Details
> here: http://www.eham.net/reviews/detail/1205
>
> I wonder if the K3 with the subreceiver could be made to do something
> similar, the architecture would probably not allow it because the DSP from
> the subreceiver and the main receiver aren't connected, but it would sure
> be a great thing to have.
>
> At my QTH we suffer from daily QRM on 40m, which starts around 2000z and is
> usually gone by 2315z, putting S7 noise all over the 40m band, I haven't
> been able to track it down yet but myself and several other hams are
> looking at it (it's affecting an area of many square miles, including the
> entire area surrounding Cambridge).
>
> If there was a way to do something similar directly in the K3, perhaps with
> a new add-on module, that would be fantastic. I realize the chances are
> slim, but here's throwing the idea into the air!
>
> 73, Thomas M0TRN
> (K3 #4208, KX3 on order)
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

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[Tim Tucker]

It works quite well if you can put up a second antenna that receives the
noise you are trying to eliminate.  Directionality really has nothing to do
with it.  If you can receive the noise at an adequate enough level, the
MFJ-1026 can be used to null it out by changing the phase of the undesired
signal as compared to the desired signal.  I published a fairly extensive
functional review of the MFJ-1026 attached to a K3, including a live video
demonstration here:
http://www.worldwidedx.com/product-reviews/110176-mfj-1026-noise-canceling-signal-enhancer-review.html



On Fri, Jan 20, 2012 at 4:51 PM, Bob K6UJ <[hidden email]> wrote:

> Regarding the MFJ-1026, it works quite well if your noise is coming
> basically from one direction.
>
>
> Bob
> K6UJ
>
>
>
>
> On Jan 20, 2012, at 4:47 PM, Thomas Horsten wrote:
>
> > MFJ makes something called the MFJ 1026 noise remover, that allegedly can
> > remove or reduce QRM from a specific source by phase shifting and mixing
> > the signals from your main antenna and an extra receive antenna. Details
> > here: http://www.eham.net/reviews/detail/1205
> >
> > I wonder if the K3 with the subreceiver could be made to do something
> > similar, the architecture would probably not allow it because the DSP
> from
> > the subreceiver and the main receiver aren't connected, but it would sure
> > be a great thing to have.
> >
> > At my QTH we suffer from daily QRM on 40m, which starts around 2000z and
> is
> > usually gone by 2315z, putting S7 noise all over the 40m band, I haven't
> > been able to track it down yet but myself and several other hams are
> > looking at it (it's affecting an area of many square miles, including the
> > entire area surrounding Cambridge).
> >
> > If there was a way to do something similar directly in the K3, perhaps
> with
> > a new add-on module, that would be fantastic. I realize the chances are
> > slim, but here's throwing the idea into the air!
> >
> > 73, Thomas M0TRN
> > (K3 #4208, KX3 on order)
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

--
-------------------------------------------
Owner, worldwidedx.com
AE6LX, Amateur Radio
NNN0ITA, Navy MARS
NNN0GAF FOUR, Southern CA Training Director, Navy MARS
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