Distance
146.4
km · 90.9 mi
Bearing
96.3°
true · rev 276.3°
Terrain
BLOCKED
109.1 dB diffraction
Propagation
79/100
GOOD
Margin
-47.9
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 ≈ 210 m AGL at the midpoint (630 m above the chord, 315 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 33.1 m) clears with margin. The geometric line of sight is obstructed — buried 348 m below terrain at its worst point.
Great circle
33.274, -98.178 → 33.12, -96.615 · 96.3°
Loss budget · 10 GHz
FSPL (free-space)
155.7
dB
Gaseous (O₂ + H₂O)
1.0
dB
Diffraction
109.1
dB
Rain attenuation
0.0
dB
Total path loss
265.9
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 13.5 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
-265.9
dB
RX antenna gain
30.0
dBi
RX power
-187.9
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-47.9
dB
Path weather · HRRR average of 9 samples
Temperature
72.8 °F
22.7 °C
Dewpoint
61.2 °F
16.2 °C
T/Td gap
11.6 °F
6.5 °C
Abs. humidity
13.5
g/m³
Pressure
973.5
mb
PWAT
26.3
mm
BL depth
290.0
m AGL
Refrac. gradient
-111.8
N/km · super-refractive
Propagation factors · 10 GHz
79/100
Rain
100
14%
Humidity
90
13%
PWAT
90
11%
Season
68
11%
T-Td Depression
85
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
33.3, -98.2
22.8 °C
14.0 °C
973.5 mb
-70.3
259.2
29.0 mm
—
13%
33.3, -98.0
23.0 °C
15.0 °C
975.1 mb
-86.9
296.4
29.4 mm
—
25%
33.2, -97.8
22.4 °C
17.0 °C
979.0 mb
-73.2
342.1
30.2 mm
—
38%
33.2, -97.6
21.8 °C
17.1 °C
977.7 mb
-77.9
314.6
28.5 mm
—
Midpoint
33.2, -97.4
21.6 °C
18.0 °C
980.7 mb
-111.8
315.8
27.0 mm
—
63%
33.2, -97.2
21.3 °C
16.7 °C
983.4 mb
-85.7
259.1
24.9 mm
—
75%
33.2, -97.0
23.5 °C
17.3 °C
990.4 mb
-59.5
272.6
23.5 mm
—
88%
33.1, -96.8
23.6 °C
14.9 °C
985.3 mb
-68.1
283.7
22.0 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 85
at 16:00 UTC
· low 71
at 22:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 08:00 | 84 | EXCELLENT |
| 09:00 | 78 | GOOD |
| 10:00 | 76 | GOOD |
| 11:00 | 75 | GOOD |
| 12:00 | 76 | GOOD |
| 13:00 | 76 | GOOD |
| 14:00 | 77 | GOOD |
| 15:00 | 79 | GOOD |
| 16:00 | 85 | EXCELLENT |
| 17:00 | 74 | GOOD |
| 18:00 | 76 | GOOD |
| 19:00 | 80 | EXCELLENT |
| 20:00 | 75 | GOOD |
| 21:00 | 73 | GOOD |
| 22:00 | 71 | GOOD |
| 23:00 | 71 | GOOD |
| 00:00 | 72 | GOOD |
| 01:00 · now | 73 | GOOD |