[RFI] Power Line Noise in Indonesia

[Simon Martin <simon@knaap.co.id>]

I am getting rather desperate to limit some of the interference problems I 
am suffering, would really appreciate any useful advice:

I have suffered severe power line noise for some time in my current 
location in Indonesia - I live in a built up area with interference from 
multiple directions. Currently this means I can use bands from 17m and up 
with little interference, but from 20m down I suffer terribly with solid 
S7-S9 of power line noise, briefly disappearing during rain storms. I have 
turned off the mains power and hooked the radio up to a battery but the 
noise is still there so it is not coming from any appliance/s within the house.

Contacting the local power utility is useless, their concern is to get 
electricity to people not to sort out some hams interference problems, so 
unfortunately sorting the problem at source is a non starter. I have given 
up being able to work on 40m but would like to try and limit the problem on 
20m.

Presently I use a 2 element yagi with insulated elements as a transmit 
antenna for 20m with an horizontal delta loop fed with 300 ohm windowline 
as a receive antenna (this still receives solid S6 of noise) - the yagi is 
fed with RG58 via a coaxial choke at the feedpoint and is grounded at the 
entry to the shack.

I have tried an MFJ1025 with noise sensing antenna but due to the 
intereference arriving from multiple directions have not had much success, 
I have tried DSP in various forms such as external DSP speakers, DSP on the 
radio, and also various software packages with the radio linked to the 
computer. None have provided very much relief

I am aware that I will probably not be able to cure the problem unless I 
can get to the source but am interested in any advice that might make life 
easier, particularly on 20m. Moving to the countryside does not appear as 
much of an option for me at the moment.

Regards,
Simon
YB3ASD
M0GOT 

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