Topband: AM interference on 1840

[K9FD]

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
> 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> 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 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>
>>> 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>
>>>> _________________
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>>>
>>
>> -- 
>> 73,
>> Jorge
>> CX6VM/CW5W
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