Fer what its worth, and considering I'm not sure what the heck the various terms really mean, I'm with you. I get:
If perf board is 1/4" holes spaced 1", which is what I seem to remember, the "area" of the hole is 3.14*(.125)^2=0.049 sq. inches, so the perf percentage looks like 5%. I dunno what this correction factor is, but figuring my perf board was 1/4", I get t=.25+.8*.25=0.45. D=3.625, so, I get:
F=200*(0.049/(.45*3.625))^.5=34.6 Hz.
Oddly, if you were supposed to enter the "percentage" as a number (i.e., 5 for 5%, as opposed to 0.05--which totally offends my sense of mathematics), I get to 346 Hz.
If perf board is 1/4" holes spaced 1", which is what I seem to remember, the "area" of the hole is 3.14*(.125)^2=0.049 sq. inches, so the perf percentage looks like 5%. I dunno what this correction factor is, but figuring my perf board was 1/4", I get t=.25+.8*.25=0.45. D=3.625, so, I get:
F=200*(0.049/(.45*3.625))^.5=34.6 Hz.
Oddly, if you were supposed to enter the "percentage" as a number (i.e., 5 for 5%, as opposed to 0.05--which totally offends my sense of mathematics), I get to 346 Hz.