I am not sure of the exact figure that AM BCB stations must comply to , but second order harmonics are meant to be roughly 50 to 70dB down from the main signal.
If they TX any sort of decent power then the second harmonic may be readable even at a significant distance away.
This is aggravated by modern Ham radio designs that have wide band front ends.
It is difficult for a TXR to have sharp filters that allow the 160 meter-band yet block the AM broadcast band.
Hiya
I am not sure of the exact figure that AM BCB stations must comply to , but second order harmonics are meant to be roughly 50 to 70dB down from the main signal.
If they TX any sort of decent power then the second harmonic may be readable even at a significant distance away.
This is aggravated by modern Ham radio designs that have wide band front ends.
It is difficult for a TXR to have sharp filters that allow the 160 meter-band yet block the AM broadcast band.
Regards
gregW:-) OH2FFY
OH2FFY 2 years ago