Distance
167.4
km · 104.0 mi
Bearing
36.2°
true · rev 216.2°
Terrain
BLOCKED
121.3 dB diffraction
Propagation
68/100
GOOD
Margin
-73.5
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 ≈ 275 m AGL at the midpoint (825 m above the chord, 412 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 22.9 m) clears with margin. The geometric line of sight is obstructed — buried 381 m below terrain at its worst point.
Great circle
31.909, -97.677 → 33.12, -96.615 · 36.2°
Loss budget · 24 GHz
FSPL (free-space)
164.5
dB
Gaseous (O₂ + H₂O)
5.7
dB
Diffraction
121.3
dB
Rain attenuation
0.0
dB
Total path loss
291.5
dB
Gas rate 0.0340 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 7.0 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
-291.5
dB
RX antenna gain
30.0
dBi
RX power
-213.5
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-73.5
dB
Path weather · HRRR average of 9 samples
Temperature
81.0 °F
27.2 °C
Dewpoint
43.7 °F
6.5 °C
T/Td gap
37.3 °F
20.7 °C
Abs. humidity
7.0
g/m³
Pressure
991.2
mb
PWAT
15.4
mm
BL depth
2323.7
m AGL
Refrac. gradient
0
N/km
Propagation factors · 24 GHz
68/100
Rain
100
14%
Humidity
59
13%
PWAT
80
11%
Season
47
11%
T-Td Depression
96
10%
Refractivity
50
10%
Pressure
70
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
31.9, -97.7
26.2 °C
5.8 °C
991.4 mb
2226.8
14.0 mm
—
13%
32.1, -97.5
26.6 °C
5.7 °C
995.6 mb
2222.4
13.3 mm
—
25%
32.2, -97.4
26.5 °C
6.6 °C
991.3 mb
2175.5
14.0 mm
—
38%
32.4, -97.3
27.5 °C
5.8 °C
991.2 mb
2304.1
14.5 mm
—
Midpoint
32.5, -97.1
26.6 °C
8.8 °C
995.5 mb
2382.6
16.6 mm
—
63%
32.7, -97.0
27.7 °C
7.2 °C
998.1 mb
2324.8
14.8 mm
—
75%
32.8, -96.9
28.3 °C
5.8 °C
999.3 mb
2376.2
16.3 mm
—
88%
33.0, -96.7
27.2 °C
6.3 °C
993.3 mb
2401.0
17.5 mm
—
Destination
33.1, -96.6
28.4 °C
6.3 °C
993.9 mb
2499.5
17.5 mm
—
Midpoint vertical profile
18-hour forecast · this path · 24 GHz
→ steady
Peak 73
at 03:00 UTC
· low 62
at 11:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 70 | GOOD |
| 21:00 | 71 | GOOD |
| 22:00 | 72 | GOOD |
| 23:00 | 70 | GOOD |
| 00:00 | 69 | GOOD |
| 01:00 | 65 | GOOD |
| 02:00 | 67 | GOOD |
| 03:00 | 73 | GOOD |
| 04:00 | 69 | GOOD |
| 05:00 | 72 | GOOD |
| 06:00 | 70 | GOOD |
| 07:00 | 71 | GOOD |
| 08:00 | 70 | GOOD |
| 09:00 | 70 | GOOD |
| 10:00 | 68 | GOOD |
| 11:00 | 62 | MARGINAL |
| 12:00 | 67 | GOOD |
| 13:00 · now | 66 | GOOD |