Distance
179.3
km · 111.4 mi
Bearing
90.2°
true · rev 270.2°
Terrain
BLOCKED
113.3 dB diffraction
Propagation
68/100
GOOD
Margin
-54.0
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 ≈ 315 m AGL at the midpoint (946 m above the chord, 473 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 36.7 m) clears with margin. The geometric line of sight is obstructed — buried 464 m below terrain at its worst point.
Great circle
33.209, -98.379 → 33.189, -96.452 · 90.2°
Loss budget · 10 GHz
FSPL (free-space)
157.5
dB
Gaseous (O₂ + H₂O)
1.3
dB
Diffraction
113.3
dB
Rain attenuation
0.0
dB
Total path loss
272.0
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 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
-272.0
dB
RX antenna gain
30.0
dBi
RX power
-194.0
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-54.0
dB
Path weather · HRRR average of 9 samples
Temperature
80.7 °F
27.0 °C
Dewpoint
43.0 °F
6.1 °C
T/Td gap
37.6 °F
20.9 °C
Abs. humidity
6.8
g/m³
Pressure
971.9
mb
PWAT
13.6
mm
BL depth
2305.9
m AGL
Refrac. gradient
0
N/km
Propagation factors · 10 GHz
68/100
Rain
100
14%
Humidity
70
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
33.2, -98.4
26.6 °C
4.7 °C
971.9 mb
2214.0
11.9 mm
—
13%
33.2, -98.1
26.9 °C
5.5 °C
981.1 mb
2268.8
12.6 mm
—
25%
33.2, -97.9
28.3 °C
5.6 °C
985.9 mb
2402.8
15.2 mm
—
38%
33.2, -97.7
26.1 °C
6.5 °C
985.1 mb
2315.1
12.9 mm
—
Midpoint
33.2, -97.4
25.0 °C
9.7 °C
988.2 mb
2217.7
13.8 mm
—
63%
33.2, -97.2
26.7 °C
7.8 °C
993.3 mb
2228.5
13.2 mm
—
75%
33.2, -96.9
27.8 °C
6.5 °C
995.5 mb
2387.5
15.4 mm
—
88%
33.2, -96.7
28.1 °C
4.7 °C
992.1 mb
2338.5
14.1 mm
—
Destination
33.2, -96.5
27.8 °C
4.1 °C
995.4 mb
2379.9
13.3 mm
—
Midpoint vertical profile
17-hour forecast · this path · 10 GHz
→ steady
Peak 82
at 03:00 UTC
· low 73
at 11:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 76 | GOOD |
| 21:00 | 77 | GOOD |
| 22:00 | 75 | GOOD |
| 23:00 | 79 | GOOD |
| 00:00 | 77 | GOOD |
| 01:00 | 77 | GOOD |
| 02:00 | 81 | EXCELLENT |
| 03:00 | 82 | EXCELLENT |
| 04:00 | 82 | EXCELLENT |
| 05:00 | 82 | EXCELLENT |
| 06:00 | 82 | EXCELLENT |
| 07:00 | 82 | EXCELLENT |
| 08:00 | 80 | EXCELLENT |
| 09:00 | 81 | EXCELLENT |
| 10:00 | 82 | EXCELLENT |
| 11:00 | 73 | GOOD |
| 12:00 · now | 73 | GOOD |