That's all true however those factors (antennas, feedline, matching
networks etc.) don't provide a sharp cutoff high pass filter. If
they were involved, he'd see a gradual attenuation in the vicinity of
700 kc. Apparently he doesn't--it's there above 700; gone below 700.
That _is not_ a characteristic of an arc. and anyway, line noise
is stronger in the low medium wave and low frequency range, all other
things being equal.
He can drive around with a car radio on. If he hears the noise on say
750 kc but it is completely gone at 600 or 550, then I'd consider some
other source. I might still be out on the street, some fault with a
street lamp ballast perhaps.
73
Rob
K5UJ
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