Distance
100.8
km · 62.6 mi
Bearing
145.8°
true · rev 325.8°
Terrain
BLOCKED
116.2 dB diffraction
Propagation
73/100
GOOD
Margin
-70.2
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 ≈ 100 m AGL at the midpoint (299 m above the chord, 149 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 12.7 m) clears with margin. The geometric line of sight is obstructed — buried 178 m below terrain at its worst point.
Great circle
33.94, -97.06 → 33.189, -96.452 · 145.8°
Loss budget · 47 GHz
FSPL (free-space)
165.9
dB
Gaseous (O₂ + H₂O)
6.0
dB
Diffraction
116.2
dB
Rain attenuation
0.0
dB
Total path loss
288.2
dB
Gas rate 0.0599 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 6.6 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
-288.2
dB
RX antenna gain
30.0
dBi
RX power
-210.2
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-70.2
dB
Path weather · HRRR average of 9 samples
Temperature
81.0 °F
27.2 °C
Dewpoint
42.4 °F
5.8 °C
T/Td gap
38.6 °F
21.5 °C
Abs. humidity
6.6
g/m³
Pressure
985.9
mb
PWAT
14.6
mm
BL depth
2242.3
m AGL
Refrac. gradient
0
N/km
Propagation factors · 47 GHz
73/100
Rain
100
14%
Humidity
91
13%
PWAT
80
11%
Season
55
11%
T-Td Depression
96
10%
Refractivity
50
10%
Pressure
82
10%
Sky Cover
50
8%
Wind
50
8%
Time of Day
18
4%
Atmospheric profile
HRRR 3 km
Valid 2026-05-03 22:00 UTC
· 9 samples
Point
Lat, lon
Temp
Dewpt
Press
dN/dh
BL m
PWAT
Duct
Source
33.9, -97.1
28.1 °C
6.1 °C
988.9 mb
2325.9
15.5 mm
—
13%
33.8, -97.0
27.5 °C
6.2 °C
990.1 mb
2254.5
13.7 mm
—
25%
33.8, -96.9
26.8 °C
5.9 °C
988.8 mb
2150.5
13.7 mm
—
38%
33.7, -96.8
27.0 °C
3.4 °C
987.4 mb
2047.6
10.7 mm
—
Midpoint
33.6, -96.8
27.1 °C
3.9 °C
988.8 mb
2165.4
11.8 mm
—
63%
33.5, -96.7
27.2 °C
5.6 °C
985.9 mb
2253.9
15.2 mm
—
75%
33.4, -96.6
27.9 °C
5.9 °C
991.5 mb
2357.6
15.8 mm
—
88%
33.3, -96.5
26.8 °C
7.4 °C
994.0 mb
2312.6
17.4 mm
—
Destination
33.2, -96.5
26.8 °C
7.4 °C
994.0 mb
2312.6
17.4 mm
—
Midpoint vertical profile
17-hour forecast · this path · 47 GHz
→ steady
Peak 80
at 22:00 UTC
· low 64
at 14:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 22:00 | 80 | EXCELLENT |
| 23:00 | 79 | GOOD |
| 00:00 | 78 | GOOD |
| 01:00 | 80 | EXCELLENT |
| 02:00 | 80 | EXCELLENT |
| 03:00 | 76 | GOOD |
| 04:00 | 73 | GOOD |
| 05:00 | 79 | GOOD |
| 06:00 | 79 | GOOD |
| 07:00 | 79 | GOOD |
| 08:00 | 78 | GOOD |
| 09:00 | 76 | GOOD |
| 10:00 | 77 | GOOD |
| 11:00 | 77 | GOOD |
| 12:00 | 67 | GOOD |
| 13:00 | 66 | GOOD |
| 14:00 · now | 64 | MARGINAL |