Amateur radio/Full (UK licence)/Formula sheet

< Amateur radio < Full (UK licence)

$R_{T} = R_{1}+R_{2}+R_{3}$	$\frac{1}{R_{T}} = \frac{1}{R_{1}} + \frac{1}{R_{2}} + \frac{1}{R_{3}}$	$V=IR$
$V_{out} = V_{in} \frac{R_{2}}{R_{1}+R_{2}}$	$P = VI = \frac{V^{2}}{R} = I^{2}R$	$V_{rms} = \frac{V_{peak}}{\sqrt{2}}$
$\frac{1}{C_{T}} = \frac{1}{C_{1}} + \frac{1}{C_{2}} + \frac{1}{C_{3}}$	$C_{T} = C_{1} + C_{2} + C_{3}$
$L_{T} = L_{1} + L_{2} + L_{3}$	$\frac{1}{L_{T}} = \frac{1}{L_{1}} + \frac{1}{L_{2}}$
$Z = \sqrt{R^{2}+X^{2}}$	$V_{T} = \sqrt{{V_{R}}^{2}+{V_{C}}^{2}} \;\; (or \; {V_{L}}^{2})$
$f = \frac{1}{2\pi \sqrt{LC}}$	$T=\frac{1}{f}$
$Q = \frac{2\pi fL}{R}$ or $\frac{1}{2\pi fCR}$	$Q=\frac{f_{C}}{f_{U}-F_{L}} = \frac{centre \, frequency}{bandwidth}$
$Q=2\pi fCR_{D}$	$I_{P} = I_{S}\frac{N_{s}}{N_{p}}$
$V_{S} = V_{P}\frac{N_{s}}{N_{p}}$	$f_{step} = \frac{f_{crystal}}{A}$
$I_{C} = \beta I_{B}$	$Gain\,(loss) = 10\log_{10} \frac{power\,out}{power\,in}\; dB$
$c = 3\times 10^{8} \; m/s$	$Gain\,(loss) = 20\log_{10} \frac{voltage\,out}{voltage\,in}\; dB$
$v=f\lambda$	$Return\,Loss = 10\log_{10} \frac{Reflected\,power}{Incident\,power}$
$E=\frac{7\sqrt{erp}}{d}$	$Gain = 10\log_{10} \frac{power\,from\,Yagi}{power\,from\,dipole}\; dBd$
$erp=power \times gain \; (linear)$

External links

Formula sheet

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