Hi Ed, A couple of things you need to find out. One is noise as viewed on a
spectrum analyzer may not see narrow 60 Hz sidebands depending on filter
settings and even a Ham band receiver on narrow SSB or CW may only see wideband
noise when in fact it may be 60 Hz generated.
I would suggest listening in the AM mode to your wideband noise to see if
you can hear 60 or 120 HZ components.
Second thing is that I have heard probably 50 sodium lights now and have
never had one fail to produce very loud noises on turn on when thay are cycling
as you describe. I also know that if a sodium light has failed completely but
is still being turned on by the photo cell they can produce an astounding noise
and not cycle on and off. Their noise is mostly on 160 meters here.
I am fighting a noise that sounds wide band right now but is generated on a
200KV line. It is very much wideband noise on narrow SSB or CW but very
noticeable 60 Hz on AM. Maybe a small BCB radio on the high end would be
helpful.
Good luck and keep looking
Lee K7TJR OR
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