Distance
131.1
km · 81.4 mi
Bearing
93.0°
true · rev 273.0°
Terrain
BLOCKED
95.9 dB diffraction
Propagation
79/100
GOOD
Margin
-33.6
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 ≈ 169 m AGL at the midpoint (506 m above the chord, 253 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 31.4 m) clears with margin. The geometric line of sight is obstructed — buried 205 m below terrain at its worst point.
Great circle
33.189, -98.021 → 33.12, -96.615 · 93.0°
Loss budget · 10 GHz
FSPL (free-space)
154.8
dB
Gaseous (O₂ + H₂O)
0.9
dB
Diffraction
95.9
dB
Rain attenuation
0.0
dB
Total path loss
251.6
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 13.3 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
-251.6
dB
RX antenna gain
30.0
dBi
RX power
-173.6
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-33.6
dB
Path weather · HRRR average of 9 samples
Temperature
73.7 °F
23.2 °C
Dewpoint
60.8 °F
16.0 °C
T/Td gap
12.9 °F
7.2 °C
Abs. humidity
13.3
g/m³
Pressure
975.1
mb
PWAT
25.8
mm
BL depth
285.8
m AGL
Refrac. gradient
-118.6
N/km · super-refractive
Propagation factors · 10 GHz
79/100
Rain
100
14%
Humidity
90
13%
PWAT
90
11%
Season
68
11%
T-Td Depression
85
10%
Refractivity
82
10%
Pressure
88
10%
Sky Cover
50
8%
Wind
50
8%
Time of Day
55
4%
Atmospheric profile
HRRR 3 km
Valid 2026-05-15 08:00 UTC
· 9 samples
Point
Lat, lon
Temp
Dewpt
Press
dN/dh
BL m
PWAT
Duct
Source
33.2, -98.0
23.0 °C
15.0 °C
975.1 mb
-86.9
296.4
29.4 mm
—
13%
33.2, -97.8
23.7 °C
15.0 °C
977.3 mb
-82.9
259.3
28.9 mm
—
25%
33.2, -97.7
22.8 °C
16.8 °C
982.3 mb
-79.5
336.4
28.8 mm
—
38%
33.2, -97.5
22.2 °C
16.9 °C
976.3 mb
-89.7
269.4
27.0 mm
—
Midpoint
33.2, -97.3
21.9 °C
17.4 °C
981.7 mb
-118.6
255.7
26.2 mm
—
63%
33.1, -97.1
23.7 °C
14.6 °C
988.7 mb
-58.0
331.9
24.0 mm
—
75%
33.1, -97.0
23.5 °C
17.3 °C
990.4 mb
-59.5
272.6
23.5 mm
—
88%
33.1, -96.8
23.6 °C
14.9 °C
985.3 mb
-68.1
283.7
22.0 mm
—
Destination
33.1, -96.6
24.1 °C
16.0 °C
987.4 mb
-91.5
266.6
22.0 mm
—
Midpoint vertical profile
18-hour forecast · this path · 10 GHz
→ steady
Peak 83
at 15:00 UTC
· low 71
at 22:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 08:00 | 78 | GOOD |
| 09:00 | 76 | GOOD |
| 10:00 | 75 | GOOD |
| 11:00 | 78 | GOOD |
| 12:00 | 76 | GOOD |
| 13:00 | 77 | GOOD |
| 14:00 | 77 | GOOD |
| 15:00 | 83 | EXCELLENT |
| 16:00 | 80 | EXCELLENT |
| 17:00 | 74 | GOOD |
| 18:00 | 76 | GOOD |
| 19:00 | 81 | EXCELLENT |
| 20:00 | 77 | GOOD |
| 21:00 | 72 | GOOD |
| 22:00 | 71 | GOOD |
| 23:00 | 74 | GOOD |
| 00:00 | 71 | GOOD |
| 01:00 · now | 72 | GOOD |