Distance
130.4
km · 81.1 mi
Bearing
115.2°
true · rev 295.2°
Terrain
BLOCKED
106.1 dB diffraction
Propagation
69/100
GOOD
Margin
-43.7
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 ≈ 167 m AGL at the midpoint (501 m above the chord, 250 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 31.3 m) clears with margin. The geometric line of sight is obstructed — buried 270 m below terrain at its worst point.
Great circle
33.625, -97.883 → 33.12, -96.615 · 115.2°
Loss budget · 10 GHz
FSPL (free-space)
154.7
dB
Gaseous (O₂ + H₂O)
0.9
dB
Diffraction
106.1
dB
Rain attenuation
0.0
dB
Total path loss
261.7
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
-261.7
dB
RX antenna gain
30.0
dBi
RX power
-183.7
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-43.7
dB
Path weather · HRRR average of 9 samples
Temperature
79.8 °F
26.5 °C
Dewpoint
44.7 °F
7.0 °C
T/Td gap
35.1 °F
19.5 °C
Abs. humidity
7.3
g/m³
Pressure
979.0
mb
PWAT
14.7
mm
BL depth
2263.4
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
33.6, -97.9
26.4 °C
5.1 °C
979.0 mb
2249.9
12.3 mm
—
13%
33.6, -97.7
26.3 °C
5.9 °C
979.3 mb
2248.8
13.3 mm
—
25%
33.5, -97.6
25.4 °C
8.8 °C
982.0 mb
2240.3
15.2 mm
—
38%
33.4, -97.4
24.7 °C
9.8 °C
983.6 mb
2071.5
15.0 mm
—
Midpoint
33.4, -97.2
26.4 °C
8.3 °C
989.9 mb
2184.3
14.2 mm
—
63%
33.3, -97.1
26.7 °C
6.5 °C
993.2 mb
2227.0
13.2 mm
—
75%
33.2, -96.9
27.7 °C
6.0 °C
995.5 mb
2360.1
15.5 mm
—
88%
33.2, -96.8
27.0 °C
6.8 °C
992.1 mb
2289.3
16.2 mm
—
Destination
33.1, -96.6
28.4 °C
6.3 °C
993.9 mb
2499.5
17.5 mm
—
Midpoint vertical profile
18-hour forecast · this path · 10 GHz
→ steady
Peak 84
at 05:00 UTC
· low 74
at 00:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 76 | GOOD |
| 21:00 | 75 | GOOD |
| 22:00 | 75 | GOOD |
| 23:00 | 75 | GOOD |
| 00:00 | 74 | GOOD |
| 01:00 | 78 | GOOD |
| 02:00 | 77 | GOOD |
| 03:00 | 82 | EXCELLENT |
| 04:00 | 80 | EXCELLENT |
| 05:00 | 84 | EXCELLENT |
| 06:00 | 83 | EXCELLENT |
| 07:00 | 81 | EXCELLENT |
| 08:00 | 81 | EXCELLENT |
| 09:00 | 81 | EXCELLENT |
| 10:00 | 81 | EXCELLENT |
| 11:00 | 83 | EXCELLENT |
| 12:00 | 76 | GOOD |
| 13:00 · now | 77 | GOOD |