Distance
225.0
km · 139.8 mi
Bearing
112.0°
true · rev 292.0°
Terrain
BLOCKED
146.2 dB diffraction
Propagation
73/100
GOOD
Margin
-114.7
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 ≈ 497 m AGL at the midpoint (1490 m above the chord, 745 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 18.9 m) clears with margin. The geometric line of sight is obstructed — buried 849 m below terrain at its worst point.
Great circle
33.966, -98.694 → 33.189, -96.452 · 112.0°
Loss budget · 47 GHz
FSPL (free-space)
172.9
dB
Gaseous (O₂ + H₂O)
13.5
dB
Diffraction
146.2
dB
Rain attenuation
0.0
dB
Total path loss
332.7
dB
Gas rate 0.0601 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 6.7 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
-332.7
dB
RX antenna gain
30.0
dBi
RX power
-254.7
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-114.7
dB
Path weather · HRRR average of 9 samples
Temperature
80.6 °F
27.0 °C
Dewpoint
42.6 °F
5.9 °C
T/Td gap
38.0 °F
21.1 °C
Abs. humidity
6.7
g/m³
Pressure
974.0
mb
PWAT
13.5
mm
BL depth
2271.0
m AGL
Refrac. gradient
0
N/km
Propagation factors · 47 GHz
73/100
Rain
100
14%
Humidity
90
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
34.0, -98.7
27.9 °C
4.0 °C
977.6 mb
2329.7
12.2 mm
—
13%
33.9, -98.4
27.7 °C
4.5 °C
980.7 mb
2319.0
12.5 mm
—
25%
33.8, -98.1
27.2 °C
4.5 °C
982.8 mb
2334.2
12.2 mm
—
38%
33.7, -97.9
26.4 °C
5.1 °C
979.0 mb
2249.9
12.3 mm
—
Midpoint
33.6, -97.6
24.8 °C
8.8 °C
974.0 mb
2197.3
14.3 mm
—
63%
33.5, -97.3
26.4 °C
8.3 °C
986.2 mb
2113.6
14.2 mm
—
75%
33.4, -97.0
26.8 °C
7.2 °C
992.2 mb
2249.6
14.1 mm
—
88%
33.3, -96.7
28.1 °C
5.7 °C
991.9 mb
2354.5
15.8 mm
—
Destination
33.2, -96.5
27.6 °C
4.8 °C
995.4 mb
2290.7
13.7 mm
—
Midpoint vertical profile
18-hour forecast · this path · 47 GHz
→ steady
Peak 80
at 23:00 UTC
· low 63
at 13:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 79 | GOOD |
| 21:00 | 79 | GOOD |
| 22:00 | 79 | GOOD |
| 23:00 | 80 | EXCELLENT |
| 00:00 | 75 | GOOD |
| 01:00 | 68 | GOOD |
| 02:00 | 74 | GOOD |
| 03:00 | 78 | GOOD |
| 04:00 | 77 | GOOD |
| 05:00 | 76 | GOOD |
| 06:00 | 74 | GOOD |
| 07:00 | 74 | GOOD |
| 08:00 | 74 | GOOD |
| 09:00 | 73 | GOOD |
| 10:00 | 74 | GOOD |
| 11:00 | 74 | GOOD |
| 12:00 | 64 | MARGINAL |
| 13:00 · now | 63 | MARGINAL |