Distance
182.8
km · 113.6 mi
Bearing
38.6°
true · rev 218.6°
Terrain
BLOCKED
133.3 dB diffraction
Propagation
71/100
GOOD
Margin
-97.6
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 ≈ 328 m AGL at the midpoint (984 m above the chord, 492 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 17.1 m) clears with margin. The geometric line of sight is obstructed — buried 455 m below terrain at its worst point.
Great circle
31.909, -97.677 → 33.189, -96.452 · 38.6°
Loss budget · 47 GHz
FSPL (free-space)
171.1
dB
Gaseous (O₂ + H₂O)
11.2
dB
Diffraction
133.3
dB
Rain attenuation
0.0
dB
Total path loss
315.6
dB
Gas rate 0.0610 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 7.0 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
-315.6
dB
RX antenna gain
30.0
dBi
RX power
-237.6
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-97.6
dB
Path weather · HRRR average of 9 samples
Temperature
81.0 °F
27.2 °C
Dewpoint
43.8 °F
6.5 °C
T/Td gap
37.2 °F
20.7 °C
Abs. humidity
7.0
g/m³
Pressure
991.2
mb
PWAT
15.3
mm
BL depth
2307.2
m AGL
Refrac. gradient
0
N/km
Propagation factors · 47 GHz
71/100
Rain
100
14%
Humidity
88
13%
PWAT
80
11%
Season
55
11%
T-Td Depression
96
10%
Refractivity
50
10%
Pressure
70
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
31.9, -97.7
26.2 °C
5.8 °C
991.4 mb
2226.8
14.0 mm
—
13%
32.1, -97.5
26.4 °C
8.2 °C
996.6 mb
2211.4
15.6 mm
—
25%
32.2, -97.4
26.5 °C
6.6 °C
991.3 mb
2175.5
14.0 mm
—
38%
32.4, -97.2
27.5 °C
5.8 °C
991.2 mb
2304.1
14.5 mm
—
Midpoint
32.5, -97.1
26.6 °C
8.8 °C
995.5 mb
2382.6
16.6 mm
—
63%
32.7, -96.9
28.4 °C
4.8 °C
997.9 mb
2378.3
15.0 mm
—
75%
32.9, -96.8
28.6 °C
5.8 °C
998.6 mb
2464.5
16.7 mm
—
88%
33.0, -96.6
27.1 °C
8.3 °C
997.4 mb
2330.8
17.7 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 79
at 03:00 UTC
· low 62
at 11:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 76 | GOOD |
| 21:00 | 77 | GOOD |
| 22:00 | 78 | GOOD |
| 23:00 | 77 | GOOD |
| 00:00 | 76 | GOOD |
| 01:00 | 69 | GOOD |
| 02:00 | 74 | GOOD |
| 03:00 | 79 | GOOD |
| 04:00 | 72 | GOOD |
| 05:00 | 77 | GOOD |
| 06:00 | 74 | GOOD |
| 07:00 | 75 | GOOD |
| 08:00 | 75 | GOOD |
| 09:00 | 74 | GOOD |
| 10:00 | 72 | GOOD |
| 11:00 | 62 | MARGINAL |
| 12:00 | 70 | GOOD |
| 13:00 · now | 71 | GOOD |