Distance
131.1
km · 81.5 mi
Bearing
137.0°
true · rev 317.0°
Terrain
BLOCKED
103.7 dB diffraction
Propagation
79/100
GOOD
Margin
-41.4
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 ≈ 169 m AGL at the midpoint (506 m above the chord, 253 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 31.4 m) clears with margin. The geometric line of sight is obstructed — buried 260 m below terrain at its worst point.
Great circle
33.987, -97.575 → 33.12, -96.615 · 137.0°
Loss budget · 10 GHz
FSPL (free-space)
154.8
dB
Gaseous (O₂ + H₂O)
0.9
dB
Diffraction
103.7
dB
Rain attenuation
0.0
dB
Total path loss
259.4
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 13.6 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
-259.4
dB
RX antenna gain
30.0
dBi
RX power
-181.4
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-41.4
dB
Path weather · HRRR average of 9 samples
Temperature
74.1 °F
23.4 °C
Dewpoint
61.5 °F
16.4 °C
T/Td gap
12.6 °F
7.0 °C
Abs. humidity
13.6
g/m³
Pressure
973.9
mb
PWAT
26.3
mm
BL depth
320.0
m AGL
Refrac. gradient
-103.5
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
34.0, -97.6
23.3 °C
17.2 °C
979.4 mb
-103.1
316.4
29.8 mm
—
13%
33.9, -97.5
23.6 °C
16.3 °C
977.7 mb
-84.1
343.4
29.7 mm
—
25%
33.8, -97.3
22.6 °C
17.2 °C
973.9 mb
-103.5
305.1
28.8 mm
—
38%
33.7, -97.2
22.6 °C
17.3 °C
980.1 mb
-84.1
326.6
28.7 mm
—
Midpoint
33.6, -97.1
23.0 °C
17.1 °C
985.5 mb
-82.0
349.0
26.9 mm
—
63%
33.4, -97.0
23.2 °C
16.3 °C
984.6 mb
-83.7
351.7
25.5 mm
—
75%
33.3, -96.9
23.7 °C
15.3 °C
986.5 mb
-81.8
339.3
23.5 mm
—
88%
33.2, -96.7
24.1 °C
14.8 °C
985.1 mb
-64.2
282.1
21.9 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 84
at 08:00 UTC
· low 65
at 23:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 08:00 | 84 | EXCELLENT |
| 09:00 | 76 | GOOD |
| 10:00 | 77 | GOOD |
| 11:00 | 74 | GOOD |
| 12:00 | 77 | GOOD |
| 13:00 | 77 | GOOD |
| 14:00 | 76 | GOOD |
| 15:00 | 76 | GOOD |
| 16:00 | 72 | GOOD |
| 17:00 | 74 | GOOD |
| 18:00 | 74 | GOOD |
| 19:00 | 77 | GOOD |
| 20:00 | 77 | GOOD |
| 21:00 | 68 | GOOD |
| 22:00 | 68 | GOOD |
| 23:00 | 65 | GOOD |
| 00:00 | 67 | GOOD |
| 01:00 · now | 72 | GOOD |