Distance
262.8
km · 163.3 mi
Bearing
79.1°
true · rev 259.1°
Terrain
BLOCKED
129.0 dB diffraction
Propagation
78/100
GOOD
Margin
-73.7
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 ≈ 677 m AGL at the midpoint (2032 m above the chord, 1016 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 44.4 m) clears with margin. The geometric line of sight is obstructed — buried 1012 m below terrain at its worst point.
Great circle
32.705, -99.387 → 33.12, -96.615 · 79.1°
Loss budget · 10 GHz
FSPL (free-space)
160.8
dB
Gaseous (O₂ + H₂O)
1.8
dB
Diffraction
129.0
dB
Rain attenuation
0.0
dB
Total path loss
291.7
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 12.1 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
-291.7
dB
RX antenna gain
30.0
dBi
RX power
-213.7
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-73.7
dB
Path weather · HRRR average of 9 samples
Temperature
74.5 °F
23.6 °C
Dewpoint
58.2 °F
14.6 °C
T/Td gap
16.3 °F
9.1 °C
Abs. humidity
12.1
g/m³
Pressure
950.7
mb
PWAT
27.3
mm
BL depth
249.2
m AGL
Refrac. gradient
-108.6
N/km · super-refractive
Propagation factors · 10 GHz
78/100
Rain
100
14%
Humidity
90
13%
PWAT
90
11%
Season
68
11%
T-Td Depression
70
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
32.7, -99.4
23.9 °C
14.5 °C
950.7 mb
-108.6
182.9
31.0 mm
—
13%
32.8, -99.0
24.0 °C
12.5 °C
967.0 mb
-59.0
147.9
31.2 mm
—
25%
32.8, -98.7
24.5 °C
11.9 °C
965.2 mb
-57.1
209.1
29.8 mm
—
38%
32.9, -98.3
24.6 °C
12.5 °C
970.8 mb
-67.9
263.2
28.9 mm
—
Midpoint
32.9, -98.0
23.5 °C
14.3 °C
973.3 mb
-73.5
320.8
27.4 mm
—
63%
33.0, -97.7
22.9 °C
16.5 °C
978.6 mb
-82.5
326.9
27.8 mm
—
75%
33.0, -97.3
21.7 °C
15.7 °C
985.8 mb
-65.0
253.1
24.4 mm
—
88%
33.1, -97.0
23.5 °C
17.3 °C
990.4 mb
-59.5
272.6
23.5 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 79
at 17:00 UTC
· low 65
at 23:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 08:00 | 74 | GOOD |
| 09:00 | 71 | GOOD |
| 10:00 | 75 | GOOD |
| 11:00 | 73 | GOOD |
| 12:00 | 75 | GOOD |
| 13:00 | 76 | GOOD |
| 14:00 | 78 | GOOD |
| 15:00 | 76 | GOOD |
| 16:00 | 74 | GOOD |
| 17:00 | 79 | GOOD |
| 18:00 | 77 | GOOD |
| 19:00 | 73 | GOOD |
| 20:00 | 69 | GOOD |
| 21:00 | 67 | GOOD |
| 22:00 | 66 | GOOD |
| 23:00 | 65 | GOOD |
| 00:00 | 66 | GOOD |
| 01:00 · now | 68 | GOOD |