Distance
197.1
km · 122.5 mi
Bearing
49.9°
true · rev 229.9°
Terrain
BLOCKED
127.3 dB diffraction
Propagation
63/100
MARGINAL
Margin
-84.1
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 ≈ 381 m AGL at the midpoint (1143 m above the chord, 572 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 24.8 m) clears with margin. The geometric line of sight is obstructed — buried 531 m below terrain at its worst point.
Great circle
31.988, -98.234 → 33.12, -96.615 · 49.9°
Loss budget · 24 GHz
FSPL (free-space)
165.9
dB
Gaseous (O₂ + H₂O)
8.9
dB
Diffraction
127.3
dB
Rain attenuation
0.0
dB
Total path loss
302.1
dB
Gas rate 0.0452 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 12.6 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
-302.1
dB
RX antenna gain
30.0
dBi
RX power
-224.1
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-84.1
dB
Path weather · HRRR average of 9 samples
Temperature
72.6 °F
22.5 °C
Dewpoint
59.2 °F
15.1 °C
T/Td gap
13.4 °F
7.4 °C
Abs. humidity
12.6
g/m³
Pressure
962.5
mb
PWAT
23.8
mm
BL depth
230.5
m AGL
Refrac. gradient
-114.9
N/km · super-refractive
Propagation factors · 24 GHz
63/100
Rain
100
14%
Humidity
6
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
32.0, -98.2
20.2 °C
14.8 °C
962.5 mb
-99.6
150.0
24.5 mm
—
13%
32.1, -98.0
20.6 °C
15.5 °C
968.7 mb
-93.5
149.6
24.5 mm
—
25%
32.3, -97.8
21.9 °C
16.0 °C
982.3 mb
-101.4
205.3
24.7 mm
—
38%
32.4, -97.6
23.0 °C
14.9 °C
983.0 mb
-88.4
237.1
24.0 mm
—
Midpoint
32.6, -97.4
22.7 °C
14.0 °C
981.0 mb
-114.9
236.1
23.3 mm
—
63%
32.7, -97.2
23.5 °C
14.1 °C
989.0 mb
-68.4
267.3
23.9 mm
—
75%
32.8, -97.0
23.9 °C
15.0 °C
990.9 mb
-68.1
289.9
23.7 mm
—
88%
33.0, -96.8
23.0 °C
15.6 °C
988.3 mb
-85.3
272.4
23.2 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 16:00 UTC
· low 59
at 09:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 08:00 | 63 | MARGINAL |
| 09:00 | 59 | MARGINAL |
| 10:00 | 60 | MARGINAL |
| 11:00 | 59 | MARGINAL |
| 12:00 | 61 | MARGINAL |
| 13:00 | 62 | MARGINAL |
| 14:00 | 62 | MARGINAL |
| 15:00 | 62 | MARGINAL |
| 16:00 | 64 | MARGINAL |
| 17:00 | 62 | MARGINAL |
| 18:00 | 62 | MARGINAL |
| 19:00 | 61 | MARGINAL |
| 20:00 | 61 | MARGINAL |
| 21:00 | 60 | MARGINAL |
| 22:00 | 59 | MARGINAL |
| 23:00 | 60 | MARGINAL |
| 00:00 | 59 | MARGINAL |
| 01:00 · now | 59 | MARGINAL |