[RFI] Splatter from AM Radio Station WNTS Indianapolis

[Al Groff]

Any rusty joint connected to a suitable conductor excited by sufficient 
RF can create intermod and harmonics that can be quit strong if it is 
near the receiver even if the transmitter(s) are perfectly clean.
AL, K0VM


On 10/27/2021 3:01 PM, D C _Mac_ Macdonald wrote:
> Possible that the intermod was being created in your receiver front end!
>
> 73 de Mac, K2GKK/5 in OKC, OK
>
> Sent from my iPhone
>
> On Oct 27, 2021, at 14:12, Jim Brown <jim at audiosystemsgroup.com> wrote:
>
> On 10/27/2021 6:29 AM, Gary Peterson wrote:
>> Every AM broadcast station is required to perform annual measurements, searching for these types of problems.  I contract to perform spectral measurements for most of the AM stations within a 100 mile radius of my home.  I have the necessary equipment and travel to within approximately 1 kilometer of each transmitter site.  I measure each station’s occupied bandwidth, measure harmonics, up through and including the 6th and search for spurious signals, below, in and above the broadcast band.
> Yes. But do those spectral measurements also include intermod products? I started out in ham radio in jr high school with two 5kW non-DAs within a mile of each other and about 1.5 miles from me, on 930 and 1470 kHz producing a strong product at 3870 kHz. There may have been others products, but that one gave me a lot of grief.
>
> 73, Jim K9YC
>
>
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