[RFI] 160m spur

Al Groff al.k0vm at yahoo.com
Wed Jan 11 11:13:53 EST 2023 

And you should not discount the probability that the 'mix' is caused by 
a corroded joint between two conductors somewhere.  The rusty joint 
could be any where, in the near field of the TX or near the RX. Anywhere 
there is enough RF to excite the joint and re-radiate.

AL, K0VM


On 1/11/2023 4:49 AM, Hare, Ed, W1RFI wrote:
> In many cases, Tim, AM station "harmonics" are generated by an overloaded receiver. In that case, a high-pass or bandpass filter will resolve the interference problem. In cases where AM-broadcast harmonics or intermodulation is suspect, trying a filter on the affected receiver is an important step to determining that the receiver is not being overloaded.
> ________________________________
> From: RFI <rfi-bounces+w1rfi=arrl.org at contesting.com> on behalf of Tim Duffy <k3lr at k3lr.com>
> Sent: Wednesday, January 11, 2023 3:29 AM
> To: 'AA5CT' <jwin95 at yahoo.com>; 'ezrhino fastmovers.biz' <ezrhino at fastmovers.biz>
> Cc: rfi at contesting.com <rfi at contesting.com>
> Subject: Re: [RFI] 160m spur
>
> Not sure why we are talking about filters – that have no impact on the solution to this problem
>
>
>
> Has a local ham (skin in the game) contacted the broadcast station(s) general manager or the contract chief engineer?
>
>
>
> 73
>
> K3LR
>
>
>
> CT [mailto:jwin95 at yahoo.com]
> Sent: Wednesday, January 11, 2023 3:19 AM
> To: 'ezrhino fastmovers.biz'; Tim Duffy
> Cc: rfi at contesting.com
> Subject: Re: [RFI] 160m spur
>
>
>
> re: " No RX filter can fix this."
>
>
>
> I think that is understood; also understand that a 'broadcast' filter (of the design I forwarded to the group yesterday), or two, ahead of a DF receiver could allow DFing of the 'spur' in the vicinity of the broadcast transmit antennas near the transmitter site. I don't know if that idea had occurred to all persons, or not.
>
>
>
> When a single filter can achieve 40 dB attenuation (minimum) in the BCB, TWO filters in cascade can achieve 80 dB.
>
>
>
> de AA5CT Jim
>
>
> - - - - - - - - - - - - - - -
>
>
>
> On Tuesday, January 10, 2023, 10:30:58 PM GMT-6, Tim Duffy <k3lr at k3lr.com> wrote:
>
>
>
>
>
> This issue is not a broadcast mix or overload in a ham receiver. No RX filter can fix this. This is a problem at the broadcast station(s).
>
> Listen to 1940 KHz and hear what is going on.
>
> 73
> Tim K3LR
> -----Original Message-----
> From: RFI [mailto:rfi-bounces+k3lr=k3lr.com at contesting.com] On Behalf Of ezrhino fastmovers.biz
> Sent: Tuesday, January 10, 2023 11:25 PM
> Cc: rfi at contesting.com
> Subject: Re: [RFI] 160m spur
>
> Broadcast band filters for 160m and 80m  available here https://surgestop.com/filter-products/index.html
>
> Chris
> KF7P
>
>
>
>> On Jan 10, 2023, at 10:22 AM, K2GKK D C_Mac_ Macdonald <k2gkk at hotmail.com> wrote:
>>
>> Isn't this sort of thing usually an occasion of fundamental
>> overload of the receiver front end?  Attenuation is probably
>> the only remedy.
>>
>> ICE made a high pass filter at one time as a possible aid.
>>
>> 73 - Mac, K2GKK/5
>> (Since 30 Nov 53)
>> Oklahoma City, OK
>> USAF, Ret'd 61-81
>> FAA, Ret'd 94-10
>>
>> ________________________________
>> From: RFI <rfi-bounces+k2gkk=hotmail.com at contesting.com> on behalf of Bob Kozlarek WA2SQQ <wa2sqq at gmail.com>
>> Sent: Monday, January 9, 2023 16:45
>> To: rfi at contesting.com <rfi at contesting.com>
>> Subject: [RFI] 160m spur
>>
>> So that’s where it comes from! That spur is S9, I live about 5 miles from
>> those towers. So has anyone contacted the two stations? Is this something
>> the FCC could be involved in? FYI I’m two air miles from WABC and luckily
>> they don’t give me any problems. My Flex radio is tight as a crabs butt!
>>
>> Date: Fri, 6 Jan 2023 18:36:26 -0500 (EST)
>> From: Frank W3LPL <donovanf at starpower.net>
>> To: topband <topband at contesting.com>, rfi <rfi at contesting.com>
>> Subject: Re: [RFI] The 160 meter spur
>> Message-ID:
>>         <1169758511.11327047.1673048186910.JavaMail.zimbra at starpower.net>
>> Content-Type: text/plain; charset=utf-8
>>
>> Hi Rick
>>
>> I've attached a photo of the four 237 foot towers used by 1660 kHz WWRU
>> and the four 237 foot towers used by the 1380 kHz WKDM.
>>
>> The two directive antenna arrays share the same site at
>> 350 Paterson Plank Rd, East Rutherford NJ
>> <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.google.com%2Fmaps%2Fsearch%2F350%2BPaterson%2BPlank%2BRd%2C%2BEast%2BRutherford%2BNJ%3Fentry%3Dgmail%26source%3Dg <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.google.com%2Fmaps%2Fsearch%2F350%2BPaterson%2BPlank%2BRd%2C%2BEast%2BRutherford%2BNJ%3Fentry%3Dgmail%26source%3Dg&data=05%7C01%7C%7C769f49c7410b453fa3be08daf2934f1a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638089011749005354%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Uz3ffnKeQkmjW8FvW1f%2BGK0%2FXUAUNAbeNaL%2F3EZwkWg%3D&reserved=0> &data=05%7C01%7C%7C769f49c7410b453fa3be08daf2934f1a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638089011749005354%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Uz3ffnKeQkmjW8FvW1f%2BGK0%2FXUAUNAbeNaL%2F3EZwkWg%3D&reserved=0>
>>
>> The 1940 kHz intruder is the third order intermod of 1380 and 1660 kHz
>> --
>>
>>
>>
>> *Best 73 de WA2SQQElmwood Park, NJ"The only dumb questions are those we
>> don't ask"*
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