Distance
48.8
km · 30.3 mi
Bearing
128.7°
true · rev 308.7°
Terrain
BLOCKED
75.0 dB diffraction
Propagation
69/100
GOOD
Margin
-3.6
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 ≈ 23 m AGL at the midpoint (70 m above the chord, 35 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 19.1 m) clears with margin. The geometric line of sight is obstructed — buried 63 m below terrain at its worst point.
Great circle
33.464, -96.861 → 33.189, -96.452 · 128.7°
Loss budget · 10 GHz
FSPL (free-space)
146.2
dB
Gaseous (O₂ + H₂O)
0.3
dB
Diffraction
75.0
dB
Rain attenuation
0.0
dB
Total path loss
221.6
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 15.1 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
-221.6
dB
RX antenna gain
30.0
dBi
RX power
-143.6
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-3.6
dB
Path weather · HRRR average of 9 samples
Temperature
69.0 °F
20.6 °C
Dewpoint
64.1 °F
17.9 °C
T/Td gap
4.8 °F
2.7 °C
Abs. humidity
15.1
g/m³
Pressure
991.7
mb
PWAT
41.2
mm
BL depth
689.0
m AGL
Refrac. gradient
-72.5
N/km
Propagation factors · 10 GHz
69/100
Rain
100
14%
Humidity
95
13%
PWAT
50
11%
Season
68
11%
T-Td Depression
75
10%
Refractivity
55
10%
Pressure
70
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
33.5, -96.9
21.4 °C
16.7 °C
994.5 mb
-72.5
758.5
37.7 mm
—
13%
33.4, -96.8
21.1 °C
18.1 °C
991.7 mb
-51.7
758.9
42.3 mm
—
25%
33.4, -96.8
21.1 °C
18.1 °C
991.7 mb
-51.7
758.9
42.3 mm
—
38%
33.4, -96.7
21.1 °C
18.1 °C
991.7 mb
-51.7
758.9
42.3 mm
—
Midpoint
33.3, -96.7
20.0 °C
17.7 °C
994.3 mb
-57.8
583.6
39.8 mm
—
63%
33.3, -96.6
20.0 °C
18.2 °C
995.4 mb
-53.2
781.6
42.2 mm
—
75%
33.3, -96.6
20.1 °C
17.9 °C
997.2 mb
-58.9
600.2
41.5 mm
—
88%
33.2, -96.5
20.1 °C
17.9 °C
997.2 mb
-58.9
600.2
41.5 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 · 10 GHz
→ steady
Peak 75
at 10:00 UTC
· low 60
at 02:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 21:00 | 69 | GOOD |
| 22:00 | 66 | GOOD |
| 23:00 | 68 | GOOD |
| 00:00 | 69 | GOOD |
| 01:00 | 67 | GOOD |
| 02:00 | 60 | MARGINAL |
| 03:00 | 68 | GOOD |
| 04:00 | 66 | GOOD |
| 05:00 | 67 | GOOD |
| 06:00 | 74 | GOOD |
| 07:00 | 73 | GOOD |
| 08:00 | 73 | GOOD |
| 09:00 | 74 | GOOD |
| 10:00 | 75 | GOOD |
| 11:00 | 75 | GOOD |
| 12:00 | 75 | GOOD |
| 13:00 · now | 74 | GOOD |