Distance
244.3
km · 151.8 mi
Bearing
84.2°
true · rev 264.2°
Terrain
BLOCKED
148.1 dB diffraction
Propagation
56/100
MARGINAL
Margin
-124.2
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 ≈ 586 m AGL at the midpoint (1757 m above the chord, 878 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 19.7 m) clears with margin. The geometric line of sight is obstructed — buried 940 m below terrain at its worst point.
Great circle
32.926, -99.226 → 33.12, -96.615 · 84.2°
Loss budget · 47 GHz
FSPL (free-space)
173.6
dB
Gaseous (O₂ + H₂O)
20.5
dB
Diffraction
148.1
dB
Rain attenuation
0.0
dB
Total path loss
342.2
dB
Gas rate 0.0838 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 14.6 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
-342.2
dB
RX antenna gain
30.0
dBi
RX power
-264.2
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-124.2
dB
Path weather · HRRR average of 9 samples
Temperature
67.4 °F
19.7 °C
Dewpoint
63.1 °F
17.3 °C
T/Td gap
4.3 °F
2.4 °C
Abs. humidity
14.6
g/m³
Pressure
970.6
mb
PWAT
38.4
mm
BL depth
529.7
m AGL
Refrac. gradient
-83.7
N/km
Propagation factors · 47 GHz
56/100
Rain
100
14%
Humidity
34
13%
PWAT
35
11%
Season
55
11%
T-Td Depression
38
10%
Refractivity
62
10%
Pressure
88
10%
Sky Cover
50
8%
Wind
50
8%
Time of Day
18
4%
Atmospheric profile
HRRR 3 km
Valid 2026-05-10 22:00 UTC
· 9 samples
Point
Lat, lon
Temp
Dewpt
Press
dN/dh
BL m
PWAT
Duct
Source
32.9, -99.2
19.1 °C
16.9 °C
970.6 mb
-54.7
763.4
39.0 mm
—
13%
33.0, -98.9
18.8 °C
16.6 °C
972.8 mb
-63.0
523.0
37.8 mm
—
25%
33.0, -98.6
20.1 °C
16.9 °C
977.5 mb
-79.8
593.6
37.5 mm
—
38%
33.0, -98.2
19.6 °C
17.0 °C
978.3 mb
-83.7
410.3
37.5 mm
—
Midpoint
33.0, -97.9
19.6 °C
17.1 °C
973.4 mb
-73.9
454.5
33.7 mm
—
63%
33.0, -97.6
20.8 °C
18.0 °C
986.0 mb
-52.5
583.3
39.8 mm
—
75%
33.1, -97.3
19.8 °C
17.6 °C
990.7 mb
-56.1
482.5
39.9 mm
—
88%
33.1, -96.9
19.7 °C
17.9 °C
997.7 mb
-62.8
441.0
40.7 mm
—
Destination
33.1, -96.6
19.3 °C
17.7 °C
994.8 mb
-58.4
516.1
39.8 mm
—
Midpoint vertical profile
17-hour forecast · this path · 47 GHz
→ steady
Peak 76
at 13:00 UTC
· low 41
at 01:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 22:00 | 52 | MARGINAL |
| 23:00 | 52 | MARGINAL |
| 00:00 | 50 | MARGINAL |
| 01:00 | 41 | POOR |
| 02:00 | 52 | MARGINAL |
| 03:00 | 56 | MARGINAL |
| 04:00 | 55 | MARGINAL |
| 05:00 | 58 | MARGINAL |
| 06:00 | 59 | MARGINAL |
| 07:00 | 60 | MARGINAL |
| 08:00 | 60 | MARGINAL |
| 09:00 | 61 | MARGINAL |
| 10:00 | 62 | MARGINAL |
| 11:00 | 62 | MARGINAL |
| 12:00 | 71 | GOOD |
| 13:00 | 76 | GOOD |
| 14:00 · now | 76 | GOOD |