[Elecraft] Considering a KPA-500

[Jim Brown]

On Fri,4/24/2015 11:48 PM, Nick - VE3EY wrote:
> "$ per dBm".

Hi Nick,

Interesting idea, but I find the table impossible to read without line 
breaks.

To correct a fundamental error -- dBm is dB referenced to 1 mW. 1W is 30 
dBm, 5W is 37 dBm, 100W is 50 dBm, 500W is 57 dBm, 600W (the output of a 
KPA500) is 57.8 dBm, 1 kW is 60 dBm, and 1.5 kW ks 61.78 dBm. In other 
words, dBm describes the power in Watts.

dB is 10 log (P2/P1). It's also 20 log (V2/V1) if the voltages are 
measured in the same impedance. If we want to talk about power 
referenced to 100W, the correct unit is dB, not dBm.

73, Jim K9YC