Before I decided to take out the batteries and pack up the FIM-71 until the next project comes along, and list the CM-10 on eBay I thought I'd pop out to the front yard and shoot a quick demonstration video of this transmitter in action, and also show the extreme variabilities in Part 15 transmitters. The variations you will see were similar with the WH 3.0.
Note this was NOT done in an "open field" but how many Part 15 broadcasters do you know that put their transmitters in open fields? Further, how many NOUO's have you see where the operator got to tell the FCC agent "But wait, lets take my transmitter over to the fieid over there..."
No, this is in the front yard. Next to a big ol' pine tree (that actually absorbs signal).
Note also that the readings you see on the meter are NOT the actual field strengh readings. Per the graphs in the FIM-71 manual, at the test frequency, to determine actual field strength the reading must be multiplied by the antenna factor for the frequency. In this case that is 2.25. So that reading of 5 mV (yes, that's mV not uV) is actually more like 11 mV, or 11,000 uV/m. You can do your own math for the other readings demonstrated in the video. A LEGAL reading at this frequency would be roughly 111 uV/m.
Now I realize there are those who will say "that can't possibly be right" even when seeing the meter for themselves. Personally, I don't much care. As far as I'm concerned, for someone who has no intention of ever using a Part 15 FM transmitter, my work here is done. And I challange others who may feel so inclined to do such testing to not only report actual numbers, but demonstrate them. I trust big city engineers also have access to video recorders.
Even accounting for various variables we're WAY past the limits here.
See:
TIB