Distance
167.4
km · 104.0 mi
Bearing
36.2°
true · rev 216.2°
Terrain
BLOCKED
121.1 dB diffraction
Propagation
62/100
MARGINAL
Margin
-75.3
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 377 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)
7.7
dB
Diffraction
121.1
dB
Rain attenuation
0.0
dB
Total path loss
293.3
dB
Gas rate 0.0461 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 13.0 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
-293.3
dB
RX antenna gain
30.0
dBi
RX power
-215.3
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-75.3
dB
Path weather · HRRR average of 9 samples
Temperature
72.5 °F
22.5 °C
Dewpoint
60.1 °F
15.6 °C
T/Td gap
12.4 °F
6.9 °C
Abs. humidity
13.0
g/m³
Pressure
985.0
mb
PWAT
23.3
mm
BL depth
252.4
m AGL
Refrac. gradient
-121.6
N/km · super-refractive
Propagation factors · 24 GHz
62/100
Rain
100
14%
Humidity
4
13%
PWAT
60
11%
Season
47
11%
T-Td Depression
60
10%
Refractivity
72
10%
Pressure
82
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
31.9, -97.7
19.9 °C
15.5 °C
985.3 mb
-77.9
242.6
23.2 mm
—
13%
32.1, -97.5
20.8 °C
15.2 °C
989.5 mb
-105.1
167.8
22.4 mm
—
25%
32.2, -97.4
22.3 °C
15.0 °C
985.3 mb
-104.0
246.5
23.4 mm
—
38%
32.4, -97.3
22.5 °C
15.1 °C
985.0 mb
-117.8
238.3
23.3 mm
—
Midpoint
32.5, -97.1
21.5 °C
16.0 °C
989.3 mb
-121.6
200.8
23.9 mm
—
63%
32.7, -97.0
23.2 °C
16.1 °C
991.5 mb
-102.0
262.9
24.4 mm
—
75%
32.8, -96.9
23.7 °C
16.1 °C
993.0 mb
-80.7
335.5
24.5 mm
—
88%
33.0, -96.7
24.5 °C
15.6 °C
986.8 mb
-81.7
310.9
22.9 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 64
at 18:00 UTC
· low 55
at 01:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 08:00 | 61 | MARGINAL |
| 09:00 | 61 | MARGINAL |
| 10:00 | 62 | MARGINAL |
| 11:00 | 61 | MARGINAL |
| 12:00 | 61 | MARGINAL |
| 13:00 | 61 | MARGINAL |
| 14:00 | 62 | MARGINAL |
| 15:00 | 61 | MARGINAL |
| 16:00 | 57 | MARGINAL |
| 17:00 | 60 | MARGINAL |
| 18:00 | 64 | MARGINAL |
| 19:00 | 61 | MARGINAL |
| 20:00 | 62 | MARGINAL |
| 21:00 | 62 | MARGINAL |
| 22:00 | 58 | MARGINAL |
| 23:00 | 59 | MARGINAL |
| 00:00 | 60 | MARGINAL |
| 01:00 · now | 55 | MARGINAL |