Distance
170.0
km · 105.6 mi
Bearing
103.4°
true · rev 283.4°
Terrain
BLOCKED
113.7 dB diffraction
Propagation
68/100
GOOD
Margin
-54.0
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 ≈ 283 m AGL at the midpoint (850 m above the chord, 425 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 35.7 m) clears with margin. The geometric line of sight is obstructed — buried 453 m below terrain at its worst point.
Great circle
33.556, -98.229 → 33.189, -96.452 · 103.4°
Loss budget · 10 GHz
FSPL (free-space)
157.0
dB
Gaseous (O₂ + H₂O)
1.2
dB
Diffraction
113.7
dB
Rain attenuation
0.0
dB
Total path loss
272.0
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 6.8 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
-272.0
dB
RX antenna gain
30.0
dBi
RX power
-194.0
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-54.0
dB
Path weather · HRRR average of 9 samples
Temperature
80.1 °F
26.7 °C
Dewpoint
43.1 °F
6.2 °C
T/Td gap
37.0 °F
20.5 °C
Abs. humidity
6.8
g/m³
Pressure
977.0
mb
PWAT
13.6
mm
BL depth
2253.8
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
33.6, -98.2
27.2 °C
3.5 °C
977.0 mb
2287.1
11.3 mm
—
13%
33.5, -98.0
27.1 °C
4.6 °C
979.2 mb
2266.6
12.0 mm
—
25%
33.5, -97.8
26.3 °C
5.9 °C
979.3 mb
2248.8
13.3 mm
—
38%
33.4, -97.6
24.9 °C
9.4 °C
985.5 mb
2208.6
14.2 mm
—
Midpoint
33.4, -97.3
24.7 °C
9.8 °C
983.6 mb
2071.5
15.0 mm
—
63%
33.3, -97.1
27.3 °C
7.0 °C
993.0 mb
2235.5
14.1 mm
—
75%
33.3, -96.9
27.7 °C
6.0 °C
995.5 mb
2360.1
15.5 mm
—
88%
33.2, -96.7
27.6 °C
4.7 °C
994.3 mb
2315.0
13.5 mm
—
Destination
33.2, -96.5
27.6 °C
4.8 °C
995.4 mb
2290.7
13.7 mm
—
Midpoint vertical profile
17-hour forecast · this path · 10 GHz
→ steady
Peak 82
at 05:00 UTC
· low 72
at 11:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 77 | GOOD |
| 21:00 | 77 | GOOD |
| 22:00 | 75 | GOOD |
| 23:00 | 77 | GOOD |
| 00:00 | 80 | EXCELLENT |
| 01:00 | 80 | EXCELLENT |
| 02:00 | 80 | EXCELLENT |
| 03:00 | 80 | EXCELLENT |
| 04:00 | 80 | EXCELLENT |
| 05:00 | 82 | EXCELLENT |
| 06:00 | 81 | EXCELLENT |
| 07:00 | 81 | EXCELLENT |
| 08:00 | 80 | EXCELLENT |
| 09:00 | 81 | EXCELLENT |
| 10:00 | 82 | EXCELLENT |
| 11:00 | 72 | GOOD |
| 12:00 · now | 75 | GOOD |