Re: Topband: AM interference on 1840

[K9FD <merv.k9fd@gmail.com>]

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