
frequency
Frequency
30.0000/wavelength
GHz
RED
TRANSMITTER CALCULATIONS
lambda
wavelength
Wavelength
30.0000/frequency
length
in.
R
range
Range
(wavelength/(4*pi))*10^(attenuation/20)
mi.
L(R)
attenuation
Free space attenuation
20*log10(4*pi*range/wavelength)
dB
D
diameter
Antenna diameter
(10^(gain/10)/efficiency)^.5*wavelength/pi
ft.
NF
near_field
Near field limit
diameter^2/wavelength
yd.
FF
far_field
Far field limit
2*near_field
î
surface
Surface tolerance
wavelength*log(10^(gain_reduction/10))^.5/(4*pi)
GR
gain_reduction
Gain reduction
10*log10(exp((-4*pi*surface/wavelength)^2))
BWe3
3dB E-plane beam width
32.5*(2*wavelength/diameter)
ø
BWh3
3dB H-plane beam width
37.0*(2*wavelength/diameter)
BWh1
1dB E-plane beam width
bwe3 / 3^.5
BWe1
1dB H-plane beam width
bwh3 / 3^.5
E
efficiency
Efficiency
%
G
gain
Gain
10*.4343*log((pi*diameter/wavelength)^2*efficiency)
PtdBm
tpower
Transmitter power
erp-gain
w
W
ERPdbm
erp
Effec. radiated power
tpower+gain
dBm
B
noise_bw
Noise bandwidth
10^((noise_inp+198.6)/10)/sys_temp
hz
MHz
BLUE
RECEIVER CALCULATIONS
Tsys
sys_temp
System noise temp.
10^((noise_inp+198.6)/10)/noise_bw
temp
øK
Pn
noise_inp
Effective noise input
-198.6+10*.4343*log(sys_temp*noise_bw)
Il
rf_loss
R.F. insertion loss
abs(10*.4343*log(power_coeff))
à
power_coeff
Pwr trans. coefficient
10^(-1*rf_loss/10)
To
rf_temp
Temp. of RF lines
eff_noise/(1-power_coeff)
Teff
eff_noise
Eff.noise contribution
rf_temp*(1-power_coeff)
NFm
m_noise_figure
Noise figure stage M
10*.4343*log(m_eff_noise/290+1)
Tm
m_eff_noise
Effec.noise contrib.-M
290*(10^(m_noise_figure/10)-1)
GdB
m_gain_pre
Gain preceding stage M
10*.4343*log(m_eff_noise/m_noise_temp-1)
Tmc
m_noise_temp
Noise contrib. stage M
m_eff_noise/10^(m_gain_pre/10)