"Kolstad, Joel (EIP)" wrote: > > So, we have a fix, but I'm curious -- how does a 318.75MHz > signal radiate from a hole in the rear bracket that's ~.4"x.3" wide? You'd be surprised at how little energy is needed to violate emissions testing levels. I did a little informal experiment with various length stub antennas starting at 1 inch on up to 6 inches and found high levels of emissions from 30MHz to 1GHz with something like a -20dB/decade rolloff. Not bad for a piece of wire 1 inch long. And it most likely isn't the hole that's radiating. It's probably the bracket by way of a slot effect. Slots are electrical duals of wires, but their directivity is roughly 10 times that of a simple wire. - Doug McKean ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu