galvanized screen

[angelodp]

Is the use of galvanized chicken wire as an RF screen less effective than copper foil??

ange

[Firestorm]

My guess (and it is a guess) is that it should work fine as long as you have good contact with chassis. Fender used window screen for years.

[Phil_S]

If you are looking for a cheap solution that is easy to work with, I use heavy duty aluminum foil (kitchen type -- you know on a roll). I lay a straight edge on it and tear it to size, apply a bit of glue to the wood and spread it evenly. Then carefully place the foil on the glue, lay a rag over it and use your hand to rub the foil onto the glue. It usually comes out wrinkle free, or with a minor imperfection. So far, this has worked very well for me. I think the glue costs more than the foil.

[Andy Le Blanc]

aluminium tape works good too...... or cut a piece of sheet metal
tractor supply..... home despot are cheap enough....

the pokey bits on the hardware cloth you got there might get frustrating.....
and the mesh size relates to frequency...... look at a microwave oven
the screen is a certain dimension....

[jelle]

The mesh has holes...that is where the noise enters your ckt.....I'd use the suggestions above. Besides I have seen more than one Blackface fender with the powerstage blown up due to one of these mesh wires touching the wrong parts in the chassis. Be careful!

[Cygnus X1]

Greenhorn newbie alert...

What is the purpose for it?
I have built two amps, one combo, and one head, and none of this liner on either. No problems with picking up noise. (Yet).

But these amps haven't been outside in the real world.

[Structo]

It's an RF shield.

[Aurora]

Mesh hole size...
>General RF and transmission line rules for reflective surfaces says the hole size shall not be larger than 1/10 of a wavelength.....
At a 1/4 inch mesh diagonal, you're good to beyond 1 GHz...provided perfect contact between all the wires. The purpose of this screen is to shield the amp ckt from the loudspeaker fields, - no more -no less.
In terms of general RF shielding, you'd better shield the whole amp box and cab.
Stray wires may be a problem... I'd rather use around .08 alu flashing, or thicker....and for any EM fields from a loudspeaker, steel is still the preferred metal.

EDIT> Sorry....I'm used to metric.. 0.04 alu flashing is good enough..even thick kitchen foil has too little mechanical wear resistance IMO.