On 10/9/2012 8:42 PM, KD7JYK DM09 wrote:
I've heard this sound in the past and seen/heard a mercury vapor lamp used
as a yard light produce this sound near a friends house a few years ago.
When the light finally gets "hot" enough, as far as we could tell, it was
winter, it stops flickering and this sound stops.
Those old Mercury Vapor yard lights are terrible while starting up and
there are still quite a few around. The ones I've heard usually last
less than 5 minutes, but can wipe out just about everything around for
most of that 5 minutes.
73
Roger (K8RI)
I've also heard a similar sound from a failing/flashing LED streetlamp,
although not as raspy.
Kurt
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