Topband: AM interference on 1840
K9FD
merv.k9fd at gmail.com
Mon May 20 15:17:56 EDT 2019
Boy that is pretty extreme,
When i bought this QTH I had a 50KW AM station on 830khz blasting away in
the other room from my shack. Near impossible to operate, most any band,
later the 50kw was moved and power dropped to 1 KW, that was not much
of a problem. Then the 1KW was moved also, all is fine now except for
mixing
products from junk mixers on a set up in Oahu that runs 4 transmitters on
one tower, 3rd world stations that do zero maintenance and the whole set
up is rust and paper clips. they put a signal every 10 khz from
Broadcast band
to 80 meters, and raises the noise floor on 160-80 at least 10db
besides as it
"splatters".
Numerous complaints filed to FCC is like peeing in the wind. There is no FCC
locally here in Hawaii any longer, due to reductions in staff and
engineers, so anything
goes.
Merv K9FD Molokai Island Hawaii
> 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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>
> On Mon, May 20, 2019 at 9:42 AM K9FD <merv.k9fd at gmail.com
> <mailto:merv.k9fd at 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 at yahoogroups.com <mailto:wsjtgroup at 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 at gmail.com <mailto:cx6vm.jorge at 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 <http://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 at gmail.com
> <mailto:herbert.schoenbohm at 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 at gmail.com <mailto:cx6vm.jorge at 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 <http://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
> >
> > _________________
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> > Reflector
> > _________________
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> > Reflector
>
> _________________
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>
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