Distance
243.1
km · 151.1 mi
Bearing
44.2°
true · rev 224.2°
Terrain
BLOCKED
144.2 dB diffraction
Propagation
74/100
GOOD
Margin
-114.2
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 ≈ 580 m AGL at the midpoint (1740 m above the chord, 870 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 19.7 m) clears with margin. The geometric line of sight is obstructed — buried 807 m below terrain at its worst point.
Great circle
31.565, -98.435 → 33.12, -96.615 · 44.2°
Loss budget · 47 GHz
FSPL (free-space)
173.6
dB
Gaseous (O₂ + H₂O)
14.3
dB
Diffraction
144.2
dB
Rain attenuation
0.0
dB
Total path loss
332.2
dB
Gas rate 0.0590 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 6.3 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
-332.2
dB
RX antenna gain
30.0
dBi
RX power
-254.2
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-114.2
dB
Path weather · HRRR average of 9 samples
Temperature
79.4 °F
26.3 °C
Dewpoint
41.1 °F
5.0 °C
T/Td gap
38.3 °F
21.3 °C
Abs. humidity
6.3
g/m³
Pressure
964.0
mb
PWAT
12.8
mm
BL depth
2155.6
m AGL
Refrac. gradient
0
N/km
Propagation factors · 47 GHz
74/100
Rain
100
14%
Humidity
93
13%
PWAT
80
11%
Season
55
11%
T-Td Depression
96
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
31.6, -98.4
22.4 °C
6.9 °C
964.0 mb
1688.8
11.7 mm
—
13%
31.8, -98.2
24.6 °C
6.6 °C
974.4 mb
1929.8
13.4 mm
—
25%
32.0, -98.0
25.4 °C
5.8 °C
978.3 mb
2042.3
12.6 mm
—
38%
32.1, -97.8
25.6 °C
6.0 °C
981.8 mb
2038.5
12.3 mm
—
Midpoint
32.3, -97.5
26.7 °C
5.4 °C
986.5 mb
2296.8
12.9 mm
—
63%
32.5, -97.3
26.9 °C
4.9 °C
990.3 mb
2316.4
12.4 mm
—
75%
32.7, -97.1
28.5 °C
2.4 °C
996.2 mb
2374.9
11.6 mm
—
88%
32.9, -96.8
28.4 °C
3.6 °C
999.3 mb
2334.7
14.1 mm
—
Destination
33.1, -96.6
28.2 °C
3.9 °C
994.1 mb
2377.9
13.9 mm
—
Midpoint vertical profile
17-hour forecast · this path · 47 GHz
→ steady
Peak 80
at 20:00 UTC
· low 64
at 11:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 80 | EXCELLENT |
| 21:00 | 80 | EXCELLENT |
| 22:00 | 72 | GOOD |
| 23:00 | 72 | GOOD |
| 00:00 | 72 | GOOD |
| 01:00 | 71 | GOOD |
| 02:00 | 69 | GOOD |
| 03:00 | 73 | GOOD |
| 04:00 | 72 | GOOD |
| 05:00 | 80 | EXCELLENT |
| 06:00 | 70 | GOOD |
| 07:00 | 78 | GOOD |
| 08:00 | 77 | GOOD |
| 09:00 | 76 | GOOD |
| 10:00 | 66 | GOOD |
| 11:00 | 64 | MARGINAL |
| 12:00 · now | 64 | MARGINAL |