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Your amateur radio transmitter appears to be creating interference to the television on channel 3 (60-66 MHz) when you are transmitting on the 15 metre band. Other channels are not affected. The most likely cause is:
harmonic radiation from the transmitter
The 3rd harmonic of a 15m signal (21 MHz * 3 = 63 MHz) falls directly within TV Channel 3, suggesting harmonic interference.
Warning: Generated by AI