Distance
235.6
km · 146.4 mi
Bearing
37.9°
true · rev 217.9°
Terrain
BLOCKED
123.2 dB diffraction
Propagation
74/100
GOOD
Margin
-66.8
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 ≈ 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 773 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
123.2
dB
Rain attenuation
0.0
dB
Total path loss
284.8
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 15.8 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
-284.8
dB
RX antenna gain
30.0
dBi
RX power
-206.8
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-66.8
dB
Path weather · HRRR average of 9 samples
Temperature
77.6 °F
25.3 °C
Dewpoint
65.9 °F
18.8 °C
T/Td gap
11.7 °F
6.5 °C
Abs. humidity
15.8
g/m³
Pressure
969.5
mb
PWAT
39.2
mm
BL depth
855.4
m AGL
Refrac. gradient
-73.4
N/km
Propagation factors · 10 GHz
74/100
Rain
100
14%
Humidity
95
13%
PWAT
70
11%
Season
68
11%
T-Td Depression
85
10%
Refractivity
55
10%
Pressure
88
10%
Sky Cover
50
8%
Wind
50
8%
Time of Day
18
4%
Atmospheric profile
HRRR 3 km
Valid 2026-05-10 21:00 UTC
· 9 samples
Point
Lat, lon
Temp
Dewpt
Press
dN/dh
BL m
PWAT
Duct
Source
31.5, -98.2
29.5 °C
20.9 °C
969.5 mb
-72.4
1526.8
36.1 mm
—
13%
31.7, -98.0
29.6 °C
19.9 °C
973.2 mb
-65.2
1469.0
36.7 mm
—
25%
31.9, -97.8
29.4 °C
19.3 °C
978.2 mb
-55.7
1571.7
40.1 mm
—
38%
32.1, -97.6
25.8 °C
19.3 °C
985.8 mb
-50.4
570.8
43.1 mm
—
Midpoint
32.3, -97.4
25.8 °C
19.0 °C
988.3 mb
-51.0
551.0
39.7 mm
—
63%
32.5, -97.2
24.1 °C
17.9 °C
987.9 mb
-48.9
463.3
37.8 mm
—
75%
32.7, -97.0
23.7 °C
17.9 °C
999.8 mb
-52.6
656.0
41.6 mm
—
88%
32.9, -96.8
20.7 °C
17.6 °C
998.3 mb
-73.4
433.5
37.3 mm
—
Destination
33.1, -96.6
19.4 °C
17.8 °C
995.0 mb
-62.2
456.2
40.3 mm
—
Midpoint vertical profile
17-hour forecast · this path · 10 GHz
→ steady
Peak 74
at 03:00 UTC
· low 69
at 00:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 21:00 | 71 | GOOD |
| 22:00 | 70 | GOOD |
| 23:00 | 70 | GOOD |
| 00:00 | 69 | GOOD |
| 01:00 | 70 | GOOD |
| 02:00 | 70 | GOOD |
| 03:00 | 74 | GOOD |
| 04:00 | 72 | GOOD |
| 05:00 | 72 | GOOD |
| 06:00 | 72 | GOOD |
| 07:00 | 71 | GOOD |
| 08:00 | 71 | GOOD |
| 09:00 | 71 | GOOD |
| 10:00 | 72 | GOOD |
| 11:00 | 71 | GOOD |
| 12:00 | 72 | GOOD |
| 13:00 · now | 73 | GOOD |