Distance
188.3
km · 117.0 mi
Bearing
36.9°
true · rev 216.9°
Terrain
BLOCKED
115.1 dB diffraction
Propagation
79/100
GOOD
Margin
-56.4
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 ≈ 348 m AGL at the midpoint (1043 m above the chord, 522 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 37.6 m) clears with margin. The geometric line of sight is obstructed — buried 502 m below terrain at its worst point.
Great circle
31.773, -97.831 → 33.12, -96.615 · 36.9°
Loss budget · 10 GHz
FSPL (free-space)
157.9
dB
Gaseous (O₂ + H₂O)
1.3
dB
Diffraction
115.1
dB
Rain attenuation
0.0
dB
Total path loss
274.4
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 12.8 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
-274.4
dB
RX antenna gain
30.0
dBi
RX power
-196.4
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-56.4
dB
Path weather · HRRR average of 9 samples
Temperature
72.5 °F
22.5 °C
Dewpoint
59.7 °F
15.4 °C
T/Td gap
12.9 °F
7.1 °C
Abs. humidity
12.8
g/m³
Pressure
970.2
mb
PWAT
22.9
mm
BL depth
230.1
m AGL
Refrac. gradient
-119.6
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
31.8, -97.8
20.1 °C
15.5 °C
970.2 mb
-93.3
166.3
21.7 mm
—
13%
31.9, -97.7
20.7 °C
14.8 °C
984.4 mb
-78.4
88.3
22.5 mm
—
25%
32.1, -97.5
21.6 °C
15.0 °C
990.4 mb
-96.9
207.3
22.5 mm
—
38%
32.3, -97.4
22.3 °C
15.0 °C
985.3 mb
-104.0
246.5
23.4 mm
—
Midpoint
32.4, -97.2
22.7 °C
14.8 °C
983.7 mb
-119.6
232.5
23.2 mm
—
63%
32.6, -97.1
22.5 °C
15.4 °C
987.9 mb
-104.2
252.5
24.0 mm
—
75%
32.8, -96.9
24.2 °C
16.2 °C
991.3 mb
-86.6
300.0
24.0 mm
—
88%
33.0, -96.8
24.5 °C
15.6 °C
986.8 mb
-81.7
310.9
22.9 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 78
at 14:00 UTC
· low 70
at 21:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 08:00 | 76 | GOOD |
| 09:00 | 75 | GOOD |
| 10:00 | 76 | GOOD |
| 11:00 | 76 | GOOD |
| 12:00 | 77 | GOOD |
| 13:00 | 77 | GOOD |
| 14:00 | 78 | GOOD |
| 15:00 | 75 | GOOD |
| 16:00 | 74 | GOOD |
| 17:00 | 74 | GOOD |
| 18:00 | 77 | GOOD |
| 19:00 | 74 | GOOD |
| 20:00 | 76 | GOOD |
| 21:00 | 70 | GOOD |
| 22:00 | 70 | GOOD |
| 23:00 | 70 | GOOD |
| 00:00 | 71 | GOOD |
| 01:00 · now | 73 | GOOD |