Distance
143.9
km · 89.4 mi
Bearing
121.2°
true · rev 301.2°
Terrain
BLOCKED
129.7 dB diffraction
Propagation
73/100
GOOD
Margin
-89.6
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 ≈ 203 m AGL at the midpoint (610 m above the chord, 305 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 15.2 m) clears with margin. The geometric line of sight is obstructed — buried 343 m below terrain at its worst point.
Great circle
33.798, -97.937 → 33.12, -96.615 · 121.2°
Loss budget · 47 GHz
FSPL (free-space)
169.0
dB
Gaseous (O₂ + H₂O)
8.9
dB
Diffraction
129.7
dB
Rain attenuation
0.0
dB
Total path loss
307.6
dB
Gas rate 0.0616 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 7.2 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
-307.6
dB
RX antenna gain
30.0
dBi
RX power
-229.6
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-89.6
dB
Path weather · HRRR average of 9 samples
Temperature
80.4 °F
26.9 °C
Dewpoint
44.5 °F
6.9 °C
T/Td gap
35.9 °F
19.9 °C
Abs. humidity
7.2
g/m³
Pressure
974.0
mb
PWAT
14.6
mm
BL depth
2262.3
m AGL
Refrac. gradient
0
N/km
Propagation factors · 47 GHz
73/100
Rain
100
14%
Humidity
87
13%
PWAT
80
11%
Season
55
11%
T-Td Depression
96
10%
Refractivity
50
10%
Pressure
88
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
33.8, -97.9
27.1 °C
6.3 °C
984.2 mb
2305.5
13.7 mm
—
13%
33.7, -97.8
27.4 °C
6.1 °C
983.1 mb
2318.3
14.0 mm
—
25%
33.6, -97.6
24.8 °C
8.8 °C
974.0 mb
2197.3
14.3 mm
—
38%
33.5, -97.4
25.4 °C
7.3 °C
982.6 mb
2056.9
12.5 mm
—
Midpoint
33.5, -97.3
26.4 °C
8.3 °C
986.2 mb
2113.6
14.2 mm
—
63%
33.4, -97.1
27.3 °C
7.0 °C
993.0 mb
2235.5
14.1 mm
—
75%
33.3, -96.9
27.0 °C
6.4 °C
994.5 mb
2280.0
15.1 mm
—
88%
33.2, -96.8
28.1 °C
5.7 °C
991.9 mb
2354.5
15.8 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 80
at 03:00 UTC
· low 65
at 12:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 78 | GOOD |
| 21:00 | 78 | GOOD |
| 22:00 | 79 | GOOD |
| 23:00 | 79 | GOOD |
| 00:00 | 77 | GOOD |
| 01:00 | 78 | GOOD |
| 02:00 | 76 | GOOD |
| 03:00 | 80 | EXCELLENT |
| 04:00 | 76 | GOOD |
| 05:00 | 76 | GOOD |
| 06:00 | 76 | GOOD |
| 07:00 | 77 | GOOD |
| 08:00 | 76 | GOOD |
| 09:00 | 74 | GOOD |
| 10:00 | 75 | GOOD |
| 11:00 | 67 | GOOD |
| 12:00 · now | 65 | GOOD |