Distance
175.5
km · 109.0 mi
Bearing
63.2°
true · rev 243.2°
Terrain
BLOCKED
110.2 dB diffraction
Propagation
68/100
GOOD
Margin
-50.7
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 ≈ 302 m AGL at the midpoint (906 m above the chord, 453 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 36.3 m) clears with margin. The geometric line of sight is obstructed — buried 380 m below terrain at its worst point.
Great circle
32.488, -98.135 → 33.189, -96.452 · 63.2°
Loss budget · 10 GHz
FSPL (free-space)
157.3
dB
Gaseous (O₂ + H₂O)
1.2
dB
Diffraction
110.2
dB
Rain attenuation
0.0
dB
Total path loss
268.7
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 6.9 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
-268.7
dB
RX antenna gain
30.0
dBi
RX power
-190.7
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-50.7
dB
Path weather · HRRR average of 9 samples
Temperature
80.9 °F
27.1 °C
Dewpoint
43.4 °F
6.3 °C
T/Td gap
37.4 °F
20.8 °C
Abs. humidity
6.9
g/m³
Pressure
979.9
mb
PWAT
14.8
mm
BL depth
2334.4
m AGL
Refrac. gradient
0
N/km
Propagation factors · 10 GHz
68/100
Rain
100
14%
Humidity
70
13%
PWAT
75
11%
Season
68
11%
T-Td Depression
55
10%
Refractivity
50
10%
Pressure
88
10%
Sky Cover
50
8%
Wind
50
8%
Time of Day
18
4%
Atmospheric profile
HRRR 3 km
Valid 2026-05-03 20:00 UTC
· 9 samples
Point
Lat, lon
Temp
Dewpt
Press
dN/dh
BL m
PWAT
Duct
Source
32.5, -98.1
26.8 °C
6.6 °C
979.9 mb
2251.0
14.5 mm
—
13%
32.6, -97.9
27.3 °C
5.3 °C
987.9 mb
2279.5
13.1 mm
—
25%
32.7, -97.7
27.2 °C
5.5 °C
983.0 mb
2326.3
14.1 mm
—
38%
32.8, -97.5
26.1 °C
7.9 °C
988.8 mb
2409.9
16.0 mm
—
Midpoint
32.8, -97.3
26.3 °C
6.5 °C
993.8 mb
2274.8
12.6 mm
—
63%
32.9, -97.1
27.4 °C
6.7 °C
995.6 mb
2347.8
15.1 mm
—
75%
33.0, -96.9
27.1 °C
7.5 °C
995.0 mb
2330.0
16.8 mm
—
88%
33.1, -96.7
28.4 °C
6.3 °C
993.9 mb
2499.5
17.5 mm
—
Destination
33.2, -96.5
27.6 °C
4.8 °C
995.4 mb
2290.7
13.7 mm
—
Midpoint vertical profile
18-hour forecast · this path · 10 GHz
→ steady
Peak 81
at 10:00 UTC
· low 68
at 02:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 75 | GOOD |
| 21:00 | 73 | GOOD |
| 22:00 | 74 | GOOD |
| 23:00 | 75 | GOOD |
| 00:00 | 75 | GOOD |
| 01:00 | 69 | GOOD |
| 02:00 | 68 | GOOD |
| 03:00 | 72 | GOOD |
| 04:00 | 80 | EXCELLENT |
| 05:00 | 80 | EXCELLENT |
| 06:00 | 80 | EXCELLENT |
| 07:00 | 80 | EXCELLENT |
| 08:00 | 80 | EXCELLENT |
| 09:00 | 79 | GOOD |
| 10:00 | 81 | EXCELLENT |
| 11:00 | 76 | GOOD |
| 12:00 | 76 | GOOD |
| 13:00 · now | 75 | GOOD |