Distance
40.0
km · 24.9 mi
Bearing
137.8°
true · rev 317.8°
Terrain
BLOCKED
91.6 dB diffraction
Propagation
72/100
GOOD
Margin
-33.9
dB over CW threshold
Terrain profile · SRTM 30 m + canopy + MS footprints
Line of sight
1st Fresnel
Duct layer
Horizon ray
Common volume
Over the horizon: the two horizon-skimming rays intersect at the common volume ≈ 16 m AGL at the midpoint (47 m above the chord, 24 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 8.0 m) clears with margin. The geometric line of sight is obstructed — buried 46 m below terrain at its worst point.
Great circle
33.387, -96.904 → 33.12, -96.615 · 137.8°
Loss budget · 47 GHz
FSPL (free-space)
157.9
dB
Gaseous (O₂ + H₂O)
2.4
dB
Diffraction
91.6
dB
Rain attenuation
0.0
dB
Total path loss
251.9
dB
Gas rate 0.0602 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 6.8 g/m³
Power budget
TX power
20.0
dBm
(100.0 mW)
TX antenna gain
30.0
dBi
Feed loss (×2)
-2.0
dB
EIRP
48.0
dBm
Path loss
-251.9
dB
RX antenna gain
30.0
dBi
RX power
-173.9
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-33.9
dB
Path weather · HRRR average of 9 samples
Temperature
82.1 °F
27.8 °C
Dewpoint
42.9 °F
6.0 °C
T/Td gap
39.3 °F
21.8 °C
Abs. humidity
6.8
g/m³
Pressure
991.9
mb
PWAT
15.7
mm
BL depth
2357.9
m AGL
Refrac. gradient
0
N/km
Propagation factors · 47 GHz
72/100
Rain
100
14%
Humidity
90
13%
PWAT
80
11%
Season
55
11%
T-Td Depression
96
10%
Refractivity
50
10%
Pressure
70
10%
Sky Cover
50
8%
Wind
50
8%
Time of Day
18
4%
Atmospheric profile
HRRR 3 km
Valid 2026-05-03 20:00 UTC
· 9 samples
Point
Lat, lon
Temp
Dewpt
Press
dN/dh
BL m
PWAT
Duct
Source
33.4, -96.9
27.6 °C
5.9 °C
993.6 mb
2289.9
14.3 mm
—
13%
33.4, -96.9
27.6 °C
5.9 °C
993.6 mb
2289.9
14.3 mm
—
25%
33.3, -96.8
27.6 °C
5.9 °C
993.6 mb
2289.9
14.3 mm
—
38%
33.3, -96.8
28.1 °C
5.7 °C
991.9 mb
2354.5
15.8 mm
—
Midpoint
33.3, -96.8
28.1 °C
5.7 °C
991.9 mb
2354.5
15.8 mm
—
63%
33.2, -96.7
28.1 °C
5.7 °C
991.9 mb
2354.5
15.8 mm
—
75%
33.2, -96.7
27.0 °C
6.8 °C
992.1 mb
2289.3
16.2 mm
—
88%
33.2, -96.7
28.4 °C
6.3 °C
993.9 mb
2499.5
17.5 mm
—
Destination
33.1, -96.6
28.4 °C
6.3 °C
993.9 mb
2499.5
17.5 mm
—
Midpoint vertical profile
17-hour forecast · this path · 47 GHz
→ steady
Peak 81
at 01:00 UTC
· low 66
at 12:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 76 | GOOD |
| 21:00 | 78 | GOOD |
| 22:00 | 77 | GOOD |
| 23:00 | 79 | GOOD |
| 00:00 | 78 | GOOD |
| 01:00 | 81 | EXCELLENT |
| 02:00 | 79 | GOOD |
| 03:00 | 76 | GOOD |
| 04:00 | 77 | GOOD |
| 05:00 | 79 | GOOD |
| 06:00 | 79 | GOOD |
| 07:00 | 79 | GOOD |
| 08:00 | 78 | GOOD |
| 09:00 | 78 | GOOD |
| 10:00 | 79 | GOOD |
| 11:00 | 77 | GOOD |
| 12:00 · now | 66 | GOOD |