Distance
254.0
km · 157.8 mi
Bearing
86.4°
true · rev 266.4°
Terrain
BLOCKED
128.5 dB diffraction
Propagation
68/100
GOOD
Margin
-72.8
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 ≈ 633 m AGL at the midpoint (1899 m above the chord, 949 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 43.6 m) clears with margin. The geometric line of sight is obstructed — buried 958 m below terrain at its worst point.
Great circle
33.075, -99.176 → 33.189, -96.452 · 86.4°
Loss budget · 10 GHz
FSPL (free-space)
160.5
dB
Gaseous (O₂ + H₂O)
1.8
dB
Diffraction
128.5
dB
Rain attenuation
0.0
dB
Total path loss
290.8
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 6.6 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
-290.8
dB
RX antenna gain
30.0
dBi
RX power
-212.8
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-72.8
dB
Path weather · HRRR average of 9 samples
Temperature
80.2 °F
26.8 °C
Dewpoint
42.3 °F
5.7 °C
T/Td gap
37.8 °F
21.0 °C
Abs. humidity
6.6
g/m³
Pressure
970.7
mb
PWAT
13.1
mm
BL depth
2295.5
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
33.1, -99.2
26.3 °C
6.6 °C
970.7 mb
2241.7
13.8 mm
—
13%
33.1, -98.8
26.6 °C
6.0 °C
974.0 mb
2242.8
13.2 mm
—
25%
33.1, -98.5
26.8 °C
6.0 °C
974.4 mb
2292.6
13.8 mm
—
38%
33.1, -98.2
26.7 °C
6.0 °C
973.8 mb
2305.8
14.1 mm
—
Midpoint
33.1, -97.8
27.3 °C
3.8 °C
984.9 mb
2338.0
11.1 mm
—
63%
33.1, -97.5
25.2 °C
8.2 °C
983.8 mb
2295.4
13.2 mm
—
75%
33.2, -97.1
27.1 °C
6.3 °C
996.2 mb
2253.7
12.1 mm
—
88%
33.2, -96.8
27.2 °C
4.7 °C
992.1 mb
2309.6
13.7 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 80
at 09:00 UTC
· low 65
at 02:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 73 | GOOD |
| 21:00 | 74 | GOOD |
| 22:00 | 67 | GOOD |
| 23:00 | 66 | GOOD |
| 00:00 | 67 | GOOD |
| 01:00 | 67 | GOOD |
| 02:00 | 65 | GOOD |
| 03:00 | 75 | GOOD |
| 04:00 | 79 | GOOD |
| 05:00 | 79 | GOOD |
| 06:00 | 79 | GOOD |
| 07:00 | 79 | GOOD |
| 08:00 | 79 | GOOD |
| 09:00 | 80 | EXCELLENT |
| 10:00 | 77 | GOOD |
| 11:00 | 75 | GOOD |
| 12:00 · now | 73 | GOOD |