Sun / Moon Noise Calculator
Amateur Radio EME & Solar Noise
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☀ Solar / Lunar Noise Analysis
Sun & Moon Noise Calculator
Real solar flux · Dish gain · Cascaded system noise · Y-factor rise — 144 MHz to 47 GHz
Solar Flux Data
Fetching F10.7…
F10.7 index:
—
SFU
Override F10.7 (leave blank to use live)
Quiet sun ≈ 67–80 SFU · Active ≈ 150–300 SFU
Antenna / Dish
Dish Diameter (m)
f/D Ratio
Feed Type
Chaparral / Scalar Horn
Septum Polarizer
Corrugated / Smooth Horn
Patch / Patch Array
Helix
Linear Dipole + Reflector
OMT Feed
Other / Custom
Feed Illumination Efficiency (%)
Auto-set by feed type and f/D — edit to override
Dish Construction
Solid — Precision (σ ≤ 0.1 mm)
Solid — Good quality (σ ≈ 0.3 mm)
Solid / Fiberglass (σ ≈ 0.8 mm)
Mesh — Fine (spacing ≤ 12 mm)
Mesh — Medium (spacing ≤ 30 mm)
Mesh — Coarse (spacing ≤ 60 mm)
Surface RMS (mm)
Mesh Spacing (mm)
Ruze surface loss + mesh transparency applied per-band
RF Chain (Noise Cascade)
Loss before LNA (dB)
LNA NF (dB)
LNA Gain (dB)
Loss after LNA (dB)
Feed line + connectors. T_amb assumed 290 K.
Additional sky/noise (K)
Galactic / atmospheric already included
Cascaded Receiver NF — referred to antenna port
Rcvr NF
—
dB
T_rcvr
—
K
Feed loss + LNA + post-LNA chain · T₀ = 290 K
⚡ CALCULATE
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Results — All Amateur Bands
Band
Freq
λ (mm)
G (dBi)
HPBW (°)
η total (%)
T_sys (K)
NF_sys (dB)
S_sun (SFU)
T_sun (K)
☀ Rise (dB)
T_moon (K)
☽ Rise (dB)
Click CALCULATE to compute
≥ 1.0 dB — easy to detect
0.3–1.0 dB — needs care
< 0.3 dB — very hard
beam fills source
☀ Solar Flux Spectrum (SFU)
☀ Sun Noise Rise (dB)
☽ Moon Noise Rise (dB)
System Noise Temperature Breakdown (at selected band)