Distance
197.1
km · 122.5 mi
Bearing
49.9°
true · rev 229.9°
Terrain
BLOCKED
136.3 dB diffraction
Propagation
73/100
GOOD
Margin
-102.0
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 ≈ 381 m AGL at the midpoint (1143 m above the chord, 572 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 17.7 m) clears with margin. The geometric line of sight is obstructed — buried 535 m below terrain at its worst point.
Great circle
31.988, -98.234 → 33.12, -96.615 · 49.9°
Loss budget · 47 GHz
FSPL (free-space)
171.8
dB
Gaseous (O₂ + H₂O)
12.0
dB
Diffraction
136.3
dB
Rain attenuation
0.0
dB
Total path loss
320.0
dB
Gas rate 0.0607 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
-320.0
dB
RX antenna gain
30.0
dBi
RX power
-242.0
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-102.0
dB
Path weather · HRRR average of 9 samples
Temperature
80.5 °F
26.9 °C
Dewpoint
43.3 °F
6.3 °C
T/Td gap
37.2 °F
20.6 °C
Abs. humidity
6.9
g/m³
Pressure
969.1
mb
PWAT
14.7
mm
BL depth
2278.7
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
32.0, -98.2
24.8 °C
5.8 °C
969.1 mb
1955.5
13.1 mm
—
13%
32.1, -98.0
25.6 °C
6.1 °C
974.9 mb
2010.6
13.5 mm
—
25%
32.3, -97.8
26.9 °C
6.1 °C
988.9 mb
2247.4
14.0 mm
—
38%
32.4, -97.6
27.3 °C
5.7 °C
989.4 mb
2280.4
13.5 mm
—
Midpoint
32.6, -97.4
27.1 °C
6.2 °C
987.4 mb
2337.1
14.3 mm
—
63%
32.7, -97.2
27.6 °C
6.2 °C
995.7 mb
2451.5
14.6 mm
—
75%
32.8, -97.0
27.7 °C
6.9 °C
997.5 mb
2396.2
15.6 mm
—
88%
33.0, -96.8
27.1 °C
7.5 °C
995.0 mb
2330.0
16.8 mm
—
Destination
33.1, -96.6
28.4 °C
6.3 °C
993.9 mb
2499.5
17.5 mm
—
Midpoint vertical profile
17-hour forecast · this path · 47 GHz
→ steady
Peak 80
at 21:00 UTC
· low 62
at 12:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 79 | GOOD |
| 21:00 | 80 | EXCELLENT |
| 22:00 | 80 | EXCELLENT |
| 23:00 | 77 | GOOD |
| 00:00 | 72 | GOOD |
| 01:00 | 72 | GOOD |
| 02:00 | 70 | GOOD |
| 03:00 | 72 | GOOD |
| 04:00 | 71 | GOOD |
| 05:00 | 79 | GOOD |
| 06:00 | 71 | GOOD |
| 07:00 | 76 | GOOD |
| 08:00 | 76 | GOOD |
| 09:00 | 76 | GOOD |
| 10:00 | 75 | GOOD |
| 11:00 | 64 | MARGINAL |
| 12:00 · now | 62 | MARGINAL |