In article ,
Tehrasha Darkon wrote:

On Wed, 5 Nov 2008, Mark wrote:

I've been a ham for over 30 years and I have a lot of experience with
EMI, but this one has me scratching my head. The wheel static
changes repeatably in different locations for no apparent reason.
It's got to be something to do with the pavement. Anybody have any
experience with this?

Mark


My guess is different lengths/types/orientation of rebar in the roadbed.

for a while glassfault i spelled it wrong it was asfault
pavement that was made with recycled glass we did a test here in
nyc i belive the first to do such testing and it was very
conductive, caused a lot of problems with the testing gear so
they put metal scraps in the mix didn't help we paved
a 1/2 block test road initially and if you had the radio on
and drove over it you heard a clearly different background noise
ie higher


ultimately the fixed it forgot how i think they tumbled the
glass and added some chemical


dunno if this has anything to do w/your specific case but
anything from hitting a certain frequency vibration that causes
a lose wire to rattle to perhaps some crappy wires burred
under the st see any manhole covers around?? telco or
sewers? typically they all have some juice and often make a
bit of noise