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@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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