Distance
235.6
km · 146.4 mi
Bearing
37.9°
true · rev 217.9°
Terrain
BLOCKED
123.1 dB diffraction
Propagation
79/100
GOOD
Margin
-66.6
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 ≈ 545 m AGL at the midpoint (1634 m above the chord, 817 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 42.0 m) clears with margin. The geometric line of sight is obstructed — buried 768 m below terrain at its worst point.
Great circle
31.457, -98.168 → 33.12, -96.615 · 37.9°
Loss budget · 10 GHz
FSPL (free-space)
159.9
dB
Gaseous (O₂ + H₂O)
1.6
dB
Diffraction
123.1
dB
Rain attenuation
0.0
dB
Total path loss
284.6
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 13.1 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
-284.6
dB
RX antenna gain
30.0
dBi
RX power
-206.6
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-66.6
dB
Path weather · HRRR average of 9 samples
Temperature
71.5 °F
21.9 °C
Dewpoint
60.3 °F
15.7 °C
T/Td gap
11.2 °F
6.2 °C
Abs. humidity
13.1
g/m³
Pressure
969.1
mb
PWAT
22.8
mm
BL depth
205.7
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
31.5, -98.2
20.0 °C
15.8 °C
969.1 mb
-111.5
65.1
22.3 mm
—
13%
31.7, -98.0
19.4 °C
15.8 °C
972.4 mb
-104.8
146.1
21.4 mm
—
25%
31.9, -97.8
20.2 °C
16.1 °C
976.8 mb
-82.9
179.8
22.5 mm
—
38%
32.1, -97.6
21.8 °C
15.1 °C
982.5 mb
-76.2
171.1
22.2 mm
—
Midpoint
32.3, -97.4
22.3 °C
15.0 °C
985.3 mb
-104.0
246.5
23.4 mm
—
63%
32.5, -97.2
22.7 °C
14.8 °C
983.7 mb
-119.6
232.5
23.2 mm
—
75%
32.7, -97.0
23.7 °C
15.5 °C
993.7 mb
-82.6
268.9
24.3 mm
—
88%
32.9, -96.8
23.3 °C
17.1 °C
992.3 mb
-101.9
274.3
24.2 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 08:00 UTC
· low 71
at 19:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 08:00 | 78 | GOOD |
| 09:00 | 76 | GOOD |
| 10:00 | 78 | GOOD |
| 11:00 | 78 | GOOD |
| 12:00 | 78 | GOOD |
| 13:00 | 78 | GOOD |
| 14:00 | 78 | GOOD |
| 15:00 | 75 | GOOD |
| 16:00 | 75 | GOOD |
| 17:00 | 74 | GOOD |
| 18:00 | 73 | GOOD |
| 19:00 | 71 | GOOD |
| 20:00 | 71 | GOOD |
| 21:00 | 74 | GOOD |
| 22:00 | 71 | GOOD |
| 23:00 | 73 | GOOD |
| 00:00 | 71 | GOOD |
| 01:00 · now | 72 | GOOD |