Distance
265.4
km · 164.9 mi
Bearing
101.3°
true · rev 281.3°
Terrain
BLOCKED
130.4 dB diffraction
Propagation
68/100
GOOD
Margin
-75.2
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 ≈ 691 m AGL at the midpoint (2073 m above the chord, 1037 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 44.6 m) clears with margin. The geometric line of sight is obstructed — buried 1069 m below terrain at its worst point.
Great circle
33.621, -99.41 → 33.12, -96.615 · 101.3°
Loss budget · 10 GHz
FSPL (free-space)
160.9
dB
Gaseous (O₂ + H₂O)
1.9
dB
Diffraction
130.4
dB
Rain attenuation
0.0
dB
Total path loss
293.2
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
-293.2
dB
RX antenna gain
30.0
dBi
RX power
-215.2
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-75.2
dB
Path weather · HRRR average of 9 samples
Temperature
79.8 °F
26.6 °C
Dewpoint
43.0 °F
6.1 °C
T/Td gap
36.8 °F
20.5 °C
Abs. humidity
6.8
g/m³
Pressure
967.4
mb
PWAT
13.1
mm
BL depth
2297.1
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
33.6, -99.4
27.2 °C
4.2 °C
967.4 mb
2350.4
12.8 mm
—
13%
33.6, -99.1
26.6 °C
5.2 °C
970.1 mb
2238.5
12.7 mm
—
25%
33.5, -98.7
27.1 °C
5.6 °C
977.4 mb
2299.4
13.1 mm
—
38%
33.4, -98.4
27.3 °C
5.0 °C
977.9 mb
2274.0
12.6 mm
—
Midpoint
33.4, -98.0
26.9 °C
4.4 °C
979.1 mb
2255.8
11.1 mm
—
63%
33.3, -97.7
26.1 °C
6.5 °C
985.1 mb
2315.1
12.9 mm
—
75%
33.2, -97.3
25.0 °C
9.7 °C
988.2 mb
2217.7
13.8 mm
—
88%
33.2, -97.0
24.4 °C
10.4 °C
997.5 mb
2345.3
15.1 mm
—
Destination
33.1, -96.6
28.2 °C
3.9 °C
994.1 mb
2377.9
13.9 mm
—
Midpoint vertical profile
17-hour forecast · this path · 10 GHz
→ steady
Peak 82
at 06:00 UTC
· low 66
at 02:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 74 | GOOD |
| 21:00 | 74 | GOOD |
| 22:00 | 74 | GOOD |
| 23:00 | 69 | GOOD |
| 00:00 | 76 | GOOD |
| 01:00 | 75 | GOOD |
| 02:00 | 66 | GOOD |
| 03:00 | 76 | GOOD |
| 04:00 | 79 | GOOD |
| 05:00 | 81 | EXCELLENT |
| 06:00 | 82 | EXCELLENT |
| 07:00 | 82 | EXCELLENT |
| 08:00 | 82 | EXCELLENT |
| 09:00 | 81 | EXCELLENT |
| 10:00 | 82 | EXCELLENT |
| 11:00 | 74 | GOOD |
| 12:00 · now | 75 | GOOD |