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1st of 5
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Last night, while dxing the AM band, I came across 1440 which was appeared to be an echo of KRLD 1080. Was this just a mixing product or does KRLD translate to somewhere on this freq?
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1
1st of 5
Guest
Yeah, only by about 300 miles. It could be a mixing product, but what is it mixing with?
1st of 5 said:Yeah, only by about 300 miles. It could be a mixing product, but what is it mixing with?
Do you have a strong local station on 720 or 1260? Could be third-order (2x-y) intermod caused by receiver overload or other non-linearity in the RF and/or mixer circuits. If x=1080 and y=720, 2x-y = 1440. If x=1260 and y=1080, 2x-y=1440.
KeithE4 said:1st of 5 said:Yeah, only by about 300 miles. It could be a mixing product, but what is it mixing with?
Do you have a strong local station on 720 or 1260? Could be third-order (2x-y) intermod caused by receiver overload or other non-linearity in the RF and/or mixer circuits. If x=1080 and y=720, 2x-y = 1440. If x=1260 and y=1080, 2x-y=1440.
I believe this explains the issue I am dealing with. I live near AM 970's transmitter and I am receiving other local stations at multiple locations on the AM band. I can pick up AM 790 on 1150, AM 840 on 1100, AM 900 on 1040, and AM 1080 on 860.
scanman1809 said:KeithE4 said:1st of 5 said:Yeah, only by about 300 miles. It could be a mixing product, but what is it mixing with?
Do you have a strong local station on 720 or 1260? Could be third-order (2x-y) intermod caused by receiver overload or other non-linearity in the RF and/or mixer circuits. If x=1080 and y=720, 2x-y = 1440. If x=1260 and y=1080, 2x-y=1440.
I believe this explains the issue I am dealing with. I live near AM 970's transmitter and I am receiving other local stations at multiple locations on the AM band. I can pick up AM 790 on 1150, AM 840 on 1100, AM 900 on 1040, and AM 1080 on 860.
Yep, those are all 3rd-order intermod products of (2 * 970) - 790, 840, 900, and 1080. Your radio is definitely overloading. Try turning the radio so that it nulls 970 and see if those intermod products go away.
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