THIS METHOD PRODUCES AN APPROXIMATE MEASURMENT WHICH GIVES OBSERVERS AN IDEA OF THE PERFORMANCE OF THEIR RADIO TELESCOPES AND SHOULD NOT HE TAKEN AS AN ACCURATE SCIENTIFIC CALIBRATED ASSESSMENT, WHICH REQUIRES HOT GROUND AND COLD SKY CALIBRATION.
ezCol plot is in linear units:
dB above background = 20 * log10(S / B)
where:
S = signal level (peak)
B = background level
Background is determined from the noise floor of the ezCol plot, for these approximate assessments.
ezCol plot is in linear units:
dB above background = 20 * log10(S / B)
- ezCol raw data is voltage not power.
- When data is power, the equation is 10*log10(S/B), but here this will give you a wrong value (only half of what you should get), because ezCol raw data is voltage not power.
- The relationship between power and voltage depends on what else you know.
- For a resistor, the basic equations are:
- I = V/R
- The definition of power:
- Power: P = V × I
- You can derive:
- P = V^2 / R
- P = I^2 × R
where:
- P = power (watts, W)
- V = voltage (volts, V)
- I = current (amperes, A)
- R = resistance (ohms, ohm)
- Rearranging for voltage gives:
- V = sqrt(P × R)
- Hence, power is proportionate to voltage squared.