Distance
243.1
km · 151.1 mi
Bearing
44.2°
true · rev 224.2°
Terrain
BLOCKED
135.3 dB diffraction
Propagation
63/100
MARGINAL
Margin
-96.2
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 ≈ 27.6 m) clears with margin. The geometric line of sight is obstructed — buried 802 m below terrain at its worst point.
Great circle
31.565, -98.435 → 33.12, -96.615 · 44.2°
Loss budget · 24 GHz
FSPL (free-space)
167.8
dB
Gaseous (O₂ + H₂O)
11.1
dB
Diffraction
135.3
dB
Rain attenuation
0.0
dB
Total path loss
314.2
dB
Gas rate 0.0458 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 12.9 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
-314.2
dB
RX antenna gain
30.0
dBi
RX power
-236.2
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-96.2
dB
Path weather · HRRR average of 9 samples
Temperature
71.6 °F
22.0 °C
Dewpoint
59.8 °F
15.5 °C
T/Td gap
11.7 °F
6.5 °C
Abs. humidity
12.9
g/m³
Pressure
957.0
mb
PWAT
22.6
mm
BL depth
210.3
m AGL
Refrac. gradient
-138.7
N/km · super-refractive
Propagation factors · 24 GHz
63/100
Rain
100
14%
Humidity
5
13%
PWAT
60
11%
Season
47
11%
T-Td Depression
60
10%
Refractivity
72
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
31.6, -98.4
19.9 °C
15.9 °C
957.0 mb
-126.9
167.1
20.2 mm
—
13%
31.8, -98.2
20.3 °C
16.0 °C
967.3 mb
-138.7
153.4
20.4 mm
—
25%
32.0, -98.0
20.4 °C
15.6 °C
971.7 mb
-94.2
69.8
23.5 mm
—
38%
32.1, -97.8
20.9 °C
15.8 °C
975.1 mb
-91.3
165.2
22.7 mm
—
Midpoint
32.3, -97.5
22.4 °C
14.1 °C
979.8 mb
-113.3
234.3
23.7 mm
—
63%
32.5, -97.3
22.7 °C
14.8 °C
983.7 mb
-119.6
232.5
23.2 mm
—
75%
32.7, -97.1
23.6 °C
14.8 °C
989.2 mb
-76.8
268.6
23.5 mm
—
88%
32.9, -96.8
23.7 °C
16.1 °C
993.0 mb
-80.7
335.5
24.5 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 · 24 GHz
→ steady
Peak 63
at 08:00 UTC
· low 55
at 01:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 08:00 | 63 | MARGINAL |
| 09:00 | 61 | MARGINAL |
| 10:00 | 61 | MARGINAL |
| 11:00 | 62 | MARGINAL |
| 12:00 | 63 | MARGINAL |
| 13:00 | 62 | MARGINAL |
| 14:00 | 62 | MARGINAL |
| 15:00 | 62 | MARGINAL |
| 16:00 | 61 | MARGINAL |
| 17:00 | 62 | MARGINAL |
| 18:00 | 62 | MARGINAL |
| 19:00 | 61 | MARGINAL |
| 20:00 | 59 | MARGINAL |
| 21:00 | 59 | MARGINAL |
| 22:00 | 59 | MARGINAL |
| 23:00 | 60 | MARGINAL |
| 00:00 | 60 | MARGINAL |
| 01:00 · now | 55 | MARGINAL |