RF - Formulas Flashcards
1
Q
Power gain
A
PG = 10log (P2 / P1)
2
Q
Voltage gain (dB)
A
20log (V2 / V1)
3
Q
Signal to Noise Ratio
A
Signal Power (Ps) / Noise Power (Pn)
4
Q
Noise Figure (NF)
A
NF = 10log ( (Sin / Nin) / (Sout / Nout)) = 10logNR
5
Q
Standing Wave Ratio
A
Γ = Er (reflected voltage) / Ei (incoming voltage)
6
Q
Voltage Standing Wave Ratio (VSWR)
A
VSWR = (1 + Γ) / (1 - Γ)
7
Q
Distance formula
A
D = RT
8
Q
Calculating time
A
t = 1 / f
9
Q
Wavelength Formula
A
t = λ / c
10
Q
Inverse Square Law
A
I = P / 4πr^2
11
Q
Sensitivity, Noise Floor, Minimal Discernible Signal Level (MDSL)
A
MDSL = -174 dBm + 10log(BW) + NF
12
Q
dBmW
A
10log(Power / 1 mW)
13
Q
AM Modulation Index / Modulation Factor / Percentage of Modulation
A
m = ((B - A) / (B +A)) x 100%
14
Q
Total transmitted power (Pt)
A
Pt = Pc(1 + (m^2 / 2))
15
Q
Image Frequency
A
(2 x IF) + fc
