Distance
120.9
km · 75.1 mi
Bearing
116.4°
true · rev 296.4°
Terrain
BLOCKED
94.7 dB diffraction
Propagation
69/100
GOOD
Margin
-31.6
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 ≈ 143 m AGL at the midpoint (430 m above the chord, 215 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 30.1 m) clears with margin. The geometric line of sight is obstructed — buried 174 m below terrain at its worst point.
Great circle
33.678, -97.615 → 33.189, -96.452 · 116.4°
Loss budget · 10 GHz
FSPL (free-space)
154.1
dB
Gaseous (O₂ + H₂O)
0.9
dB
Diffraction
94.7
dB
Rain attenuation
0.0
dB
Total path loss
249.6
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 7.3 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
-249.6
dB
RX antenna gain
30.0
dBi
RX power
-171.6
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-31.6
dB
Path weather · HRRR average of 9 samples
Temperature
80.1 °F
26.7 °C
Dewpoint
44.7 °F
7.0 °C
T/Td gap
35.5 °F
19.7 °C
Abs. humidity
7.3
g/m³
Pressure
974.0
mb
PWAT
14.3
mm
BL depth
2223.8
m AGL
Refrac. gradient
0
N/km
Propagation factors · 10 GHz
69/100
Rain
100
14%
Humidity
82
13%
PWAT
75
11%
Season
68
11%
T-Td Depression
55
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
33.7, -97.6
24.8 °C
8.8 °C
974.0 mb
2197.3
14.3 mm
—
13%
33.6, -97.5
25.3 °C
9.7 °C
977.9 mb
2012.7
14.7 mm
—
25%
33.6, -97.3
25.7 °C
8.6 °C
983.5 mb
2069.5
13.7 mm
—
38%
33.5, -97.2
27.1 °C
7.9 °C
992.6 mb
2235.0
14.7 mm
—
Midpoint
33.4, -97.0
26.8 °C
7.2 °C
992.2 mb
2249.6
14.1 mm
—
63%
33.4, -96.9
27.6 °C
5.9 °C
993.6 mb
2289.9
14.3 mm
—
75%
33.3, -96.7
28.1 °C
5.7 °C
991.9 mb
2354.5
15.8 mm
—
88%
33.2, -96.6
27.6 °C
4.7 °C
994.3 mb
2315.0
13.5 mm
—
Destination
33.2, -96.5
27.6 °C
4.8 °C
995.4 mb
2290.7
13.7 mm
—
Midpoint vertical profile
18-hour forecast · this path · 10 GHz
→ steady
Peak 82
at 10:00 UTC
· low 71
at 03:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 74 | GOOD |
| 21:00 | 73 | GOOD |
| 22:00 | 73 | GOOD |
| 23:00 | 72 | GOOD |
| 00:00 | 75 | GOOD |
| 01:00 | 77 | GOOD |
| 02:00 | 76 | GOOD |
| 03:00 | 71 | GOOD |
| 04:00 | 79 | GOOD |
| 05:00 | 79 | GOOD |
| 06:00 | 79 | GOOD |
| 07:00 | 80 | EXCELLENT |
| 08:00 | 81 | EXCELLENT |
| 09:00 | 81 | EXCELLENT |
| 10:00 | 82 | EXCELLENT |
| 11:00 | 82 | EXCELLENT |
| 12:00 | 74 | GOOD |
| 13:00 · now | 76 | GOOD |