|
Hi
Use your guitar pickup and 'map out' the areas of worst radiation. Go around your whole house at floor and ceiling level. Follow traces of high radiation and use 'post it' notes as markers. If you get a pattern that lines up with known wiring runs (your house or neighbours) then this could be tackled as mentioned above by getting the mains wires twisted. Assuming this can't happen then you need proper screening. We are talking sheet steel probably 1 - 2 mm thick. This will be HEAVY but is pretty cheap. You need to basically clad the whole studio area floor, walls and ceiling although depending on results of your tests earlier you may not need total enclosure. Aluminium foil does not work at screening this as the frequency is too low. A 'cage' of wire mesh might help but as it has so many holes it will not properly divert the low frequencies. Apart from the weight sheet steel is easier to make presentable (paint!). The steel plates should ideally be all welded throughout but cover plates over gaps will be sufficient.
A tough job!!
A small 'steel plated' booth may be more practical. Earthing should be done dor safety but it makes hardly and difference to electromagnetic shielding.
Go wave a pickup around and map out the hum field.
Matt S
|