Sum Ting Wong wrote:
On Tue, 08 Jan 2008 00:09:36 +1300, cliff wright
wrote:


Any ideas welcome!


Get yourself a portable VHF radio that receives AM and use a handheld
Yagi to trace down the noise. Powerline interference is much easier to
DF at VHF. Pull the main breaker on your house to make sure the noise
isn't being generated within your residence. Here in the USA, the
power companies are obligated to eliminate interference emanating from
their equipment, but don't know about ZL. It never hurts to ask. The
power companies up here have very skilled folks who track down
powerline interference complaints.

Good luck with finding the source.

S.T.W.
Hi STW.
Been There Done that!!!
Yes OM we've tried all sorts of search receivers and antennas. Had some
success in locating some vey poorly maitained insulators in a 32Kv
overhead line about 500 metres from our 2 QTH's. Problem is the liabilty
for interfernce is very poorly defined here in NZ. The power generating
companies and line companies are separate and poorly coordinated as a
result of abortive privatisation in the 1980's an 90's.
We have our people from our Trade and Industry dept involved already.
These are the equivalent of our Radio Inspectors of earlier times and
are of some help.
However we are now both concerned that the interference may be carried
or even caused by faulty earthing arrangements in our local underground
"neutral earthed" system. I am a registered electrician and my fellow
Ham is actually employed by a lines company.
So much for my nice electrically quiet section on a hilltop for my
retirement!!!
However I will follow up some of the pointers which have been suggested
and hope that now the main summer holidays are coming to an end down
here some maintenance work will get done.
73's Cliff Wright