Distance
238.6
km · 148.3 mi
Bearing
88.1°
true · rev 268.1°
Terrain
BLOCKED
146.1 dB diffraction
Propagation
73/100
GOOD
Margin
-116.0
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 ≈ 558 m AGL at the midpoint (1675 m above the chord, 838 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 19.5 m) clears with margin. The geometric line of sight is obstructed — buried 845 m below terrain at its worst point.
Great circle
33.075, -99.176 → 33.12, -96.615 · 88.1°
Loss budget · 47 GHz
FSPL (free-space)
173.4
dB
Gaseous (O₂ + H₂O)
14.4
dB
Diffraction
146.1
dB
Rain attenuation
0.0
dB
Total path loss
334.0
dB
Gas rate 0.0606 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 6.9 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
-334.0
dB
RX antenna gain
30.0
dBi
RX power
-256.0
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-116.0
dB
Path weather · HRRR average of 9 samples
Temperature
80.2 °F
26.8 °C
Dewpoint
43.2 °F
6.2 °C
T/Td gap
37.0 °F
20.6 °C
Abs. humidity
6.9
g/m³
Pressure
970.7
mb
PWAT
13.6
mm
BL depth
2297.7
m AGL
Refrac. gradient
0
N/km
Propagation factors · 47 GHz
73/100
Rain
100
14%
Humidity
89
13%
PWAT
80
11%
Season
55
11%
T-Td Depression
96
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
33.1, -99.2
26.3 °C
6.6 °C
970.7 mb
2241.7
13.8 mm
—
13%
33.1, -98.9
26.6 °C
6.0 °C
974.0 mb
2242.8
13.2 mm
—
25%
33.1, -98.5
26.8 °C
6.0 °C
974.4 mb
2292.6
13.8 mm
—
38%
33.1, -98.2
26.3 °C
6.5 °C
971.9 mb
2225.5
13.9 mm
—
Midpoint
33.1, -97.9
27.3 °C
3.8 °C
984.9 mb
2338.0
11.1 mm
—
63%
33.1, -97.6
27.3 °C
7.3 °C
989.5 mb
2445.7
16.2 mm
—
75%
33.1, -97.3
24.9 °C
9.5 °C
990.9 mb
2182.0
12.8 mm
—
88%
33.1, -96.9
27.3 °C
6.2 °C
995.3 mb
2332.9
14.2 mm
—
Destination
33.1, -96.6
28.2 °C
3.9 °C
994.1 mb
2377.9
13.9 mm
—
Midpoint vertical profile
17-hour forecast · this path · 47 GHz
→ steady
Peak 81
at 21:00 UTC
· low 64
at 12:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 80 | EXCELLENT |
| 21:00 | 81 | EXCELLENT |
| 22:00 | 73 | GOOD |
| 23:00 | 72 | GOOD |
| 00:00 | 73 | GOOD |
| 01:00 | 70 | GOOD |
| 02:00 | 71 | GOOD |
| 03:00 | 81 | EXCELLENT |
| 04:00 | 79 | GOOD |
| 05:00 | 79 | GOOD |
| 06:00 | 79 | GOOD |
| 07:00 | 79 | GOOD |
| 08:00 | 75 | GOOD |
| 09:00 | 75 | GOOD |
| 10:00 | 73 | GOOD |
| 11:00 | 67 | GOOD |
| 12:00 · now | 64 | MARGINAL |