20 LOG (V1/V2)= 20dB down
About 10 Watts - but still a lot.
We all fall into that dB trap from time to time I bet !!!!!!!
Andy
An interesting number:
If Jim's measurement of MM0ALM's field strength is right, at 50 uV/m, and
assuming the distance between them is 600 kms mainly over a standard
medium-conductivity land path then :
According to the CCIR standard propagation curves (Vol 5, "Propagation in
non-ionised media", Recommendation 368-4) a radiated power of 1 kW at 136
kHz from a short vertically-polarised monopole would produce a field
strength at Jim's distance of 500 uV/m.
Jim measured 50 uV/m so MM0ALM's radiated power must be 10 dB below 1 kW -
100 watts. Jim's measurements I have found to be pretty accurate in the
past but if anyone else can make accurate field strength measurements
perhaps they would do so next time MM0ALM comes on.
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