Distance
111.5
km · 69.3 mi
Bearing
100.3°
true · rev 280.3°
Terrain
BLOCKED
102.9 dB diffraction
Propagation
51/100
MARGINAL
Margin
-51.4
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 ≈ 122 m AGL at the midpoint (366 m above the chord, 183 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 18.7 m) clears with margin. The geometric line of sight is obstructed — buried 154 m below terrain at its worst point.
Great circle
33.374, -97.63 → 33.189, -96.452 · 100.3°
Loss budget · 24 GHz
FSPL (free-space)
161.0
dB
Gaseous (O₂ + H₂O)
5.6
dB
Diffraction
102.9
dB
Rain attenuation
0.0
dB
Total path loss
269.4
dB
Gas rate 0.0501 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 15.0 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
-269.4
dB
RX antenna gain
30.0
dBi
RX power
-191.4
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-51.4
dB
Path weather · HRRR average of 9 samples
Temperature
68.7 °F
20.4 °C
Dewpoint
64.0 °F
17.8 °C
T/Td gap
4.8 °F
2.7 °C
Abs. humidity
15.0
g/m³
Pressure
980.1
mb
PWAT
41.5
mm
BL depth
754.0
m AGL
Refrac. gradient
-58.9
N/km
Propagation factors · 24 GHz
51/100
Rain
100
14%
Humidity
0
13%
PWAT
15
11%
Season
47
11%
T-Td Depression
38
10%
Refractivity
55
10%
Pressure
82
10%
Sky Cover
50
8%
Wind
50
8%
Time of Day
18
4%
Atmospheric profile
HRRR 3 km
Valid 2026-05-10 21:00 UTC
· 9 samples
Point
Lat, lon
Temp
Dewpt
Press
dN/dh
BL m
PWAT
Duct
Source
33.4, -97.6
19.8 °C
17.1 °C
980.1 mb
-54.7
776.9
40.5 mm
—
13%
33.4, -97.5
20.3 °C
17.2 °C
987.0 mb
-49.1
815.1
38.8 mm
—
25%
33.3, -97.3
21.4 °C
17.5 °C
985.2 mb
-50.2
1009.9
40.1 mm
—
38%
33.3, -97.2
21.2 °C
17.4 °C
992.9 mb
-53.3
648.0
41.1 mm
—
Midpoint
33.3, -97.0
20.4 °C
18.0 °C
995.5 mb
-51.5
636.7
42.0 mm
—
63%
33.3, -96.9
20.4 °C
18.4 °C
996.8 mb
-52.6
857.5
43.0 mm
—
75%
33.2, -96.7
20.2 °C
18.1 °C
993.1 mb
-56.4
659.9
44.6 mm
—
88%
33.2, -96.6
20.0 °C
18.2 °C
995.4 mb
-53.2
781.6
42.2 mm
—
Destination
33.2, -96.5
20.1 °C
17.9 °C
997.2 mb
-58.9
600.2
41.5 mm
—
Midpoint vertical profile
17-hour forecast · this path · 24 GHz
→ steady
Peak 63
at 13:00 UTC
· low 41
at 02:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 21:00 | 46 | POOR |
| 22:00 | 47 | POOR |
| 23:00 | 50 | MARGINAL |
| 00:00 | 47 | POOR |
| 01:00 | 49 | POOR |
| 02:00 | 41 | POOR |
| 03:00 | 50 | MARGINAL |
| 04:00 | 54 | MARGINAL |
| 05:00 | 54 | MARGINAL |
| 06:00 | 55 | MARGINAL |
| 07:00 | 56 | MARGINAL |
| 08:00 | 55 | MARGINAL |
| 09:00 | 59 | MARGINAL |
| 10:00 | 60 | MARGINAL |
| 11:00 | 60 | MARGINAL |
| 12:00 | 62 | MARGINAL |
| 13:00 · now | 63 | MARGINAL |