[Lowfer] Article copies - mw/lw wideband noise reduction

[Andy - KU4XR]

Greetings Dave:

I would greatly appreciate a copy of this information. I can
take it as a .zip , or a .pdf , .doc , plain text. The only
file I can't open at present is Excel.  If you will put me on
your list I will appreciate it.  73, and GudDay

Andy - KU4XR - EM75xr - Friendsville, TN.
LOWfer Beacon " XR " @ 184.322 KHz ( QRSS-60 )
Coordinates:  N:  35* 43' 54" - W:  84* 3' 16"
http://www.myspace.com/beaconxr


--- On Mon, 1/12/09, Peter Cranwell <pete at pcranwell.com> wrote:

> From: Peter Cranwell <pete at pcranwell.com>
> Subject: Re: [Lowfer] Poor man's mw/lw wideband noise reduction
> To: "Discussion of the Lowfer (US, European, & UK) and MedFer bands" <lowfer at mailman.qth.net>
> Date: Monday, January 12, 2009, 8:16 AM
> I would appreciate a copy.
> 
> Thanks
> 
> Pete
> ----- Original Message ----- 
> From: "Dave Brown" <tractorb at ihug.co.nz>
> To: "Discussion of the Lowfer (US, European,
> &amp;UK) and MedFer bands" 
> <lowfer at mailman.qth.net>
> Sent: Sunday, January 11, 2009 6:44 AM
> Subject: Re: [Lowfer] Poor man's mw/lw wideband noise
> reduction
> 
> 
> > An LF oriented phasing system of this type was
> originally described by
> > the late ZL2BBJ in the ZL amateur radio journal
> 'Break-In' in October
> > 1996.  Another version built by George, ZL3PN was
> published in the
> > November 1996 issue.
> > The October 1998 LF column in Break-In described yet
> another version
> > built by the late ZL3VN. These all differ from the
> VK5BR version (AR,
> > 2000)  that Scott referenced, primarily in the use of
> discrete
> > bipolars or FETs, rather than op-amps.  I can arrange
> copies for those
> > interested.
> > 73
> > Dave, ZL3FJ
> >
> > ----- Original Message ----- 
> > From: "Scott Tilley"
> <sthed475 at telus.net>
> > To: "Discussion of the Lowfer (US, European,
> &amp;UK) and MedFer
> > bands" <lowfer at mailman.qth.net>
> > Sent: Sunday, January 11, 2009 8:33 AM
> > Subject: Re: [Lowfer] Poor man's mw/lw wideband
> noise reduction
> >
> >
> >> HI Paul
> >>
> >> A method  used here done with a small
> 'noise' antenna and my LF
> >> 'sense'
> >> antenna and then mixing the two RF signals
> together produces
> >> excellent
> >> results and even allowed me to work the Yukon from
> within the City
> >> of
> >> Vancouver...  Normally a phase shifting network is
> used on the noise
> >> signal to allow one to first adjust the phase of
> the noise signal
> >> 180
> >> degrees of the received noise on the sense
> antenna.  Once you have
> >> adjusted the phase then the amplitude of the two
> RF signals is
> >> adjusted
> >> such that the offending signal is canceled.  This
> is really an
> >> iterative
> >> thing as each back and forth adjustment further
> improves the
> >> canceling.
> >>
> >> I use such a device on 2200m to deal with my one
> neighbour's light
> >> dimmer.   It also works (very well I might add) on
> any signals you
> >> receive on both antennas so it can be used to
> cancel local NDBs for
> >> example so you you can hear the DX ones on the
> same frequency...
> >>
> >> See here for a design I modified for 2200m.  It
> works well in the
> >> lowfer
> >> band to 600m as described...
> >>
> >>
> http://users.tpg.com.au/users/ldbutler/LFNoiseCancel.htm
> >>
> >> Also see
> >> http://www.alg.myzen.co.uk/radio/136/pre_sel.htm
> >>
> >> 73 Scott
> >> VE7TIL
> >>
> >>
> >> PAUL DAULTON wrote:
> >>>
> >>> I found an article in Elektor magazine feb
> 2005, which can be
> >>> downloaded from Elektors's site, about
> >>>
> >>> a noise reduction method.
> >>>
> >>>
> >>>
> >>> Basically two receivers are used.The
> loudspeaker outputs of the two
> >>> radios are connected in phase while
> >>>
> >>> the speaker in the second rec is disconnected.
> With the second
> >>> receiver tuned a little higher or lower than
> >>>
> >>> the main one the speaker of the main receiver
> is fed with the
> >>> difference between the two signals. External
> >>>
> >>> antennas should be connected in parallel.
> Using the volume
> >>> adjustment
> >>> on the second radio a setting can be
> >>>
> >>> found that should result in a reduction of
> noise.
> >>>
> >>>
> >>>
> >>> Sounds good I am trying to figure out how to
> apply to Argo
> >>> connections.
> >>>
> >>>
> >>>
> >>> Any comments?
> >>>
> >>>
> >>>
> >>> Paul K5wms
> >>>
> >>>
> ------------------------------------------------------------------------
> >>>
> >>>
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> >
> >
> >
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