Distance
246.7
km · 153.3 mi
Bearing
97.3°
true · rev 277.3°
Terrain
BLOCKED
127.8 dB diffraction
Propagation
68/100
GOOD
Margin
-71.8
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 ≈ 597 m AGL at the midpoint (1791 m above the chord, 895 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 43.0 m) clears with margin. The geometric line of sight is obstructed — buried 945 m below terrain at its worst point.
Great circle
33.498, -99.081 → 33.189, -96.452 · 97.3°
Loss budget · 10 GHz
FSPL (free-space)
160.3
dB
Gaseous (O₂ + H₂O)
1.7
dB
Diffraction
127.8
dB
Rain attenuation
0.0
dB
Total path loss
289.8
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 6.5 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
-289.8
dB
RX antenna gain
30.0
dBi
RX power
-211.8
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-71.8
dB
Path weather · HRRR average of 9 samples
Temperature
80.8 °F
27.1 °C
Dewpoint
41.6 °F
5.3 °C
T/Td gap
39.2 °F
21.8 °C
Abs. humidity
6.5
g/m³
Pressure
970.8
mb
PWAT
12.7
mm
BL depth
2287.9
m AGL
Refrac. gradient
0
N/km
Propagation factors · 10 GHz
68/100
Rain
100
14%
Humidity
70
13%
PWAT
75
11%
Season
68
11%
T-Td Depression
55
10%
Refractivity
50
10%
Pressure
88
10%
Sky Cover
50
8%
Wind
50
8%
Time of Day
18
4%
Atmospheric profile
HRRR 3 km
Valid 2026-05-03 20:00 UTC
· 9 samples
Point
Lat, lon
Temp
Dewpt
Press
dN/dh
BL m
PWAT
Duct
Source
33.5, -99.1
26.9 °C
4.2 °C
970.8 mb
2283.3
11.9 mm
—
13%
33.5, -98.8
27.1 °C
5.6 °C
977.4 mb
2299.4
13.1 mm
—
25%
33.4, -98.4
27.3 °C
5.0 °C
977.9 mb
2274.0
12.6 mm
—
38%
33.4, -98.1
27.1 °C
3.6 °C
980.2 mb
2244.0
10.3 mm
—
Midpoint
33.3, -97.8
26.8 °C
5.5 °C
985.4 mb
2284.5
12.4 mm
—
63%
33.3, -97.4
26.0 °C
7.5 °C
985.4 mb
2259.3
13.2 mm
—
75%
33.3, -97.1
26.7 °C
7.8 °C
993.3 mb
2228.5
13.2 mm
—
88%
33.2, -96.8
28.1 °C
4.7 °C
992.1 mb
2338.5
14.1 mm
—
Destination
33.2, -96.5
27.8 °C
4.1 °C
995.4 mb
2379.9
13.3 mm
—
Midpoint vertical profile
17-hour forecast · this path · 10 GHz
→ steady
Peak 82
at 06:00 UTC
· low 72
at 01:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 74 | GOOD |
| 21:00 | 74 | GOOD |
| 22:00 | 74 | GOOD |
| 23:00 | 74 | GOOD |
| 00:00 | 77 | GOOD |
| 01:00 | 72 | GOOD |
| 02:00 | 75 | GOOD |
| 03:00 | 75 | GOOD |
| 04:00 | 78 | GOOD |
| 05:00 | 79 | GOOD |
| 06:00 | 82 | EXCELLENT |
| 07:00 | 82 | EXCELLENT |
| 08:00 | 81 | EXCELLENT |
| 09:00 | 80 | EXCELLENT |
| 10:00 | 82 | EXCELLENT |
| 11:00 | 73 | GOOD |
| 12:00 · now | 75 | GOOD |