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If a neighbour reports television interference on one or two channels only when you transmit on 15 metres, what is probably the cause of the interference?
Harmonic radiation from your transmitter
Harmonics are multiples of the fundamental frequency. If the second or third harmonic of your 15m transmission (21 MHz) falls on a TV channel (e.g., 3rd harmonic ≈ 63 MHz, near Ch 3), it can cause interference only on that channel.
Warning: Generated by AI