It was a bit more complicated than that. If the station under observation
was using a directional antenna (whether rotatable or switchable), the FCC
had to make sure no changes were made to the antenna in the interval between
the two measurements you have mentioned.

"Jim" wrote in message
...
Anyone know how the FCC makes their field strength measurements in the
HF region? I seem to remember them using a 1 meter long dipole that
gave readout in microvolts, and they would measure at a certain
distance in meters from the antenna. I think the unit was calibrated
and sealed so that the measurements could be used in court. They
would make measurements at a certain distance, and then go into the
violators home and have him tune up at 1 kw input, then read the
strength again.

I wonder what they use today?

Can anyone point to an article on how to make an accurate field
strength meter that would give a readout in microvolts/meter. I did a
search but haven't found anything yet.

Jim