Yeah sorry got frequencies flipped. Notch on 1860. See what happens. I live
a mile away from 760KHz running 50KW 24/7. I use a W6LVP RX loop with one
of his BCB filters in it plus another BCB filter right at the rig input.
This reduces the signal from 60+ over to about S9.
73! Mark KA6WKE
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Author: 4NEC2 The Definitive Guide
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On Mon, May 20, 2019 at 9:42 AM K9FD <merv.k9fd@gmail.com> wrote:
> Explain how a notch filter on 930 can help a second harmonic on 1860?
>
> You can filter the broadcast band to zero and the second harmonic is
> still there.
>
>
> > Mark, I use a receiving array and have put a high pass filter on the
> > receiving array to cut the broadcast band down. I have an AM station
> > near here that was doing the same thing. If you can run a separate RX
> > only antenna it helps. If not then a notch filter for 930 may work
> > that you can transmit through.
> >
> > Tim, K9CQ
> >
> > -----Original Message----- From: Mpridesti via Topband
> > Sent: Monday, May 20, 2019 11:24 AM
> > To: Jorge Diez - CX6VM
> > Cc: TopBand List ; Herbert Schoenbohm ; wsjtgroup@yahoogroups.com
> > Subject: Re: Topband: AM interference on 1840
> >
> > I have a local AM station here (about 3 km away) that operates on 930
> > kHz. Their second harmonic is 1860. Seems they are operating within
> > specification and abide by FCC regulations. But still the second
> > harmonic wipes out any DX on or near that frequency. Signal strength
> > is around S7.
> >
> > Regards,
> >
> > Mark, K1RX
> >
> >
> >> On May 20, 2019, at 11:54 AM, Jorge Diez - CX6VM
> >> <cx6vm.jorge@gmail.com> wrote:
> >>
> >> I think HK authorities must do something with this. Local radio
> >> Clubs must
> >> act
> >>
> >> https://www.lavozdelpueblo920am.com/programacion
> >>
> https://www.facebook.com/mauriciovargaslavozdelpueblo/photos/a.1922152811350449/2377754772456915/?type=1&theater
> >>
> >> https://twitter.com/mauriciov920
> >> https://raddio.net/134431-colmundo-radio-ibague/
> >>
> >> 73,
> >> Jorge
> >> CX6VM/CW5W
> >>
> >> <
> https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail>
>
> >>
> >> Libre
> >> de virus. www.avast.com
> >> <
> https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail>
>
> >>
> >> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
> >>
> >> El lun., 20 may. 2019 a las 12:47, Herbert Schoenbohm (<
> >> herbert.schoenbohm@gmail.com>) escribió:
> >>
> >>> Interference from them makes 1840 useless for me. Since they don't
> >>> respond to my emails maybe WSJT-X could assign 1844 or 1848 to 160
> >>> in their
> >>> next release.
> >>>
> >>> Herb Schoenbohm, KV4FZ
> >>>
> >>> On Mon, May 20, 2019 at 11:21 AM Jorge Diez - CX6VM
> >>> <cx6vm.jorge@gmail.com>
> >>> wrote:
> >>>
> >>>> Hello
> >>>>
> >>>> do you notice a second harmonic on 1840? It´s very strong
> >>>>
> >>>> I determined that is from LA VOZ DEL PUEBLO 920 AM, in Colombia
> >>>>
> >>>> https://www.lavozdelpueblo920am.com/
> >>>>
> >>>> I sent them an email with no answer yet.
> >>>>
> >>>> Maybe if they receive many emails will take care about that and ask
> >>>> the
> >>>> technic to solve it, what do you think?
> >>>>
> >>>> --
> >>>> 73,
> >>>> Jorge
> >>>> CX6VM/CW5W
> >>>>
> >>>> <
> >>>>
> https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail
> >>>>
> >>>>>
> >>>> Libre
> >>>> de virus. www.avast.com
> >>>> <
> >>>>
> https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail
> >>>>
> >>>>>
> >>>> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
> >>>> _________________
> >>>> Searchable Archives: http://www.contesting.com/_topband - Topband
> >>>> Reflector
> >>>>
> >>>
> >>
> >> --
> >> 73,
> >> Jorge
> >> CX6VM/CW5W
> >> _________________
> >> Searchable Archives: http://www.contesting.com/_topband - Topband
> >> Reflector
> >
> > _________________
> > Searchable Archives: http://www.contesting.com/_topband - Topband
> > Reflector
> > _________________
> > Searchable Archives: http://www.contesting.com/_topband - Topband
> > Reflector
>
> _________________
> Searchable Archives: http://www.contesting.com/_topband - Topband
> Reflector
>
_________________
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