Q: The displays shows lightning hits, but there's no storm nearby.
Q: Why A nearby station is showing lots of EMP hits, but mine shows none.
The displays shows lightning hits, but there's no storm nearby. What's wrong?
It's important to remember that the EMP sensor is essentially a VLF receiver. It's ability to hear is directly impacted by the quality of the ground plane, propagation conditions and height above average terrain (HAAT). If your installation has a HAAT of 30 feet (or more) and/or the ground plane is very efficient, it would be normal for the sensor to report hits of storms several hundred miles distant. In one recorded incident, it was reported that the sensor heard storms some 1500 miles distant. This of course is an exception and not the norm. One location in Owensboro (KY) has a sensor mounted at over 300'. To say the least, this sensor normally hears storms as far away as the Gulf coast.
A nearby station is showing lots of EMP hits, but mine shows none. Is my sensor defective?
If the height of the sensor is under 30 feet, the sensitivity will restrict the sensor's coverage out to about 30-40 miles. A side-mounted installation at 20 feet on my tower exhibits this kind of behavior. If you want to hear more, the sensor will have to be raised. Also be certain the quality of the ground plane is up to par.