km/sqrt(mW) and reports/kJ

These two metrics are added here to showcase the performance of extreme QRP stations

km/sqrt(mW) : The range in kilometres divided by square root of power in milliwatts

The higher the power used the lower you score in the this metric. I have used square root

because generally range is proportional to the square root of the power employed.

So this metric tends to neutralize the use of increased power

reports/kJ : The number of reports divided by the energy used in kiloJoules

This is calculated over a chosen period of activity e.g. a day

Energy is power multiplied by duration of transmission. So high powers

and high duty cyle ( The number of transmissions per hour ) will reduce your score

For SARC MK1 boxes consider switching them off in lean periods!

Why kilojoules rather than joules?

This avoids fractional scores which are difficult to remember