There are AC types that won't have the periodic pop. I recently
"electrified" a metal bird feeder because the raccoons were raiding it
nightly. If there is no leakage then the line is RF quiet. With any
leakage the hash is continuous just like a power line leak. Since you
control the maintenance of the fence you might want to consider the AC
type. The one I bought was a "FiShock" brand. Internally it is a
simple transformer with two separate bobbins with the secondary at
1.2kv. It makes a pretty nasty looking arc if taken across the output
terminals but is supposedly humane.
Their catalog is available from their web site at
http://www.fishock.com/. They are located here in Knoxville but I have
no connection to them.
I bought mine from Home Depot.
Among FiShock's offerings is ALUMINUM wire for the fencing--lightweight and
ideal for DXpedition or other temporary radial fields. I buy it in 1/4-mile
spools. The "suburban" Home Depots may not stock it, but the "rural" ones
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