Distance
259.4
km · 161.2 mi
Bearing
45.4°
true · rev 225.4°
Terrain
BLOCKED
126.7 dB diffraction
Propagation
68/100
GOOD
Margin
-71.3
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 ≈ 660 m AGL at the midpoint (1980 m above the chord, 990 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 44.1 m) clears with margin. The geometric line of sight is obstructed — buried 923 m below terrain at its worst point.
Great circle
31.565, -98.435 → 33.189, -96.452 · 45.4°
Loss budget · 10 GHz
FSPL (free-space)
160.7
dB
Gaseous (O₂ + H₂O)
1.8
dB
Diffraction
126.7
dB
Rain attenuation
0.0
dB
Total path loss
289.3
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 6.7 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
-289.3
dB
RX antenna gain
30.0
dBi
RX power
-211.3
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-71.3
dB
Path weather · HRRR average of 9 samples
Temperature
78.7 °F
26.0 °C
Dewpoint
42.5 °F
5.8 °C
T/Td gap
36.2 °F
20.1 °C
Abs. humidity
6.7
g/m³
Pressure
964.0
mb
PWAT
13.1
mm
BL depth
2178.1
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
31.6, -98.4
22.4 °C
6.9 °C
964.0 mb
1688.8
11.7 mm
—
13%
31.8, -98.2
24.5 °C
6.5 °C
975.5 mb
1942.4
12.7 mm
—
25%
32.0, -97.9
25.4 °C
5.8 °C
978.3 mb
2042.3
12.6 mm
—
38%
32.2, -97.7
25.6 °C
6.0 °C
981.8 mb
2038.5
12.3 mm
—
Midpoint
32.4, -97.4
26.7 °C
5.4 °C
986.5 mb
2296.8
12.9 mm
—
63%
32.6, -97.2
25.4 °C
7.2 °C
994.8 mb
2411.9
13.1 mm
—
75%
32.8, -96.9
28.0 °C
5.7 °C
1000.4 mb
2390.6
14.1 mm
—
88%
33.0, -96.7
27.6 °C
5.0 °C
993.2 mb
2412.1
15.4 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 83
at 07:00 UTC
· low 66
at 23:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 74 | GOOD |
| 21:00 | 74 | GOOD |
| 22:00 | 67 | GOOD |
| 23:00 | 66 | GOOD |
| 00:00 | 67 | GOOD |
| 01:00 | 68 | GOOD |
| 02:00 | 70 | GOOD |
| 03:00 | 74 | GOOD |
| 04:00 | 72 | GOOD |
| 05:00 | 80 | EXCELLENT |
| 06:00 | 75 | GOOD |
| 07:00 | 83 | EXCELLENT |
| 08:00 | 82 | EXCELLENT |
| 09:00 | 80 | EXCELLENT |
| 10:00 | 72 | GOOD |
| 11:00 | 76 | GOOD |
| 12:00 · now | 76 | GOOD |