Distance
157.5
km · 97.9 mi
Bearing
107.5°
true · rev 287.5°
Terrain
BLOCKED
109.0 dB diffraction
Propagation
78/100
GOOD
Margin
-48.5
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 ≈ 243 m AGL at the midpoint (730 m above the chord, 365 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 34.4 m) clears with margin. The geometric line of sight is obstructed — buried 372 m below terrain at its worst point.
Great circle
33.556, -98.229 → 33.12, -96.615 · 107.5°
Loss budget · 10 GHz
FSPL (free-space)
156.4
dB
Gaseous (O₂ + H₂O)
1.1
dB
Diffraction
109.0
dB
Rain attenuation
0.0
dB
Total path loss
266.5
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 13.1 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
-266.5
dB
RX antenna gain
30.0
dBi
RX power
-188.5
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-48.5
dB
Path weather · HRRR average of 9 samples
Temperature
73.1 °F
22.8 °C
Dewpoint
60.4 °F
15.8 °C
T/Td gap
12.7 °F
7.0 °C
Abs. humidity
13.1
g/m³
Pressure
969.5
mb
PWAT
25.9
mm
BL depth
298.1
m AGL
Refrac. gradient
-97.8
N/km
Propagation factors · 10 GHz
78/100
Rain
100
14%
Humidity
90
13%
PWAT
90
11%
Season
68
11%
T-Td Depression
85
10%
Refractivity
68
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
33.6, -98.2
23.0 °C
12.1 °C
969.5 mb
-53.9
315.4
25.3 mm
—
13%
33.5, -98.0
23.2 °C
15.6 °C
971.7 mb
-80.0
329.9
28.7 mm
—
25%
33.4, -97.8
22.7 °C
17.0 °C
972.9 mb
-97.8
329.3
30.7 mm
—
38%
33.4, -97.6
21.9 °C
16.8 °C
971.2 mb
-77.7
271.9
27.8 mm
—
Midpoint
33.3, -97.4
21.8 °C
17.7 °C
976.0 mb
-97.7
279.9
27.2 mm
—
63%
33.3, -97.2
22.0 °C
17.0 °C
984.4 mb
-96.1
313.6
25.7 mm
—
75%
33.2, -97.0
23.2 °C
14.8 °C
987.3 mb
-64.6
296.8
23.3 mm
—
88%
33.2, -96.8
23.5 °C
15.0 °C
988.3 mb
-69.0
279.1
22.7 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 · 10 GHz
→ steady
Peak 80
at 19:00 UTC
· low 69
at 00:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 08:00 | 76 | GOOD |
| 09:00 | 76 | GOOD |
| 10:00 | 76 | GOOD |
| 11:00 | 76 | GOOD |
| 12:00 | 77 | GOOD |
| 13:00 | 77 | GOOD |
| 14:00 | 74 | GOOD |
| 15:00 | 78 | GOOD |
| 16:00 | 78 | GOOD |
| 17:00 | 74 | GOOD |
| 18:00 | 76 | GOOD |
| 19:00 | 80 | EXCELLENT |
| 20:00 | 75 | GOOD |
| 21:00 | 74 | GOOD |
| 22:00 | 70 | GOOD |
| 23:00 | 71 | GOOD |
| 00:00 | 69 | GOOD |
| 01:00 · now | 75 | GOOD |