Please note that old, defunct microwaves act as (because they are) Faraday cages. I surf Craigslist looking for them, and advise all FReepers to do so also, except those in the Houton area, because I’m greedy like that.
So what do you do with the old microwave once you have it?
How old do the microwaves have to be?
I would like to put my crank radio into one.
Very good. You’ll be one of the few people who can surf the net or make a cell phone call over communication networks that aren’t working.... No, wait....
Please note that old, defunct microwaves act as (because they are) Faraday cages.
So will any card board box that is fully covered with aluminum foil and properly grounded... You just make sure to put a layer of foam rubber or bubble wrap around whatever object inside you wish to protect from the EMP. The aluminum foil absorbs the EMP and runs it to ground, while the contents are protected. Boxes and aluminum foil are a lot cheaper than retrieving old microwave ovens, and they can be had in greater numbers (if you need that many.)
For me, I use them to store an alternator, a voltage regulator, and an electronic ignition module for my 1982 Ramcharger 4x4... And then there is my communication equipment, along with various components needed make receivers and transmitters.
I also keep in mind that the Ramcharger would only be useful for as long as I could get fuel, regardless of whether or not its electronics are still good. But then again, I can make an 85% ethanol mixture with a homebuilt reflux still (manufactured from a large keg, with a T-304 stainless reflux column filled with glass marbles) and a proper "mash" mixture. In the hands of good 'shiner, it can make a liquid that will sooth both man and machine! ;-)