Distance
76.4
km · 47.5 mi
Bearing
123.1°
true · rev 303.1°
Terrain
BLOCKED
93.5 dB diffraction
Propagation
51/100
MARGINAL
Margin
-37.0
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 ≈ 57 m AGL at the midpoint (172 m above the chord, 86 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 15.5 m) clears with margin. The geometric line of sight is obstructed — buried 78 m below terrain at its worst point.
Great circle
33.497, -97.303 → 33.12, -96.615 · 123.1°
Loss budget · 24 GHz
FSPL (free-space)
157.7
dB
Gaseous (O₂ + H₂O)
3.8
dB
Diffraction
93.5
dB
Rain attenuation
0.0
dB
Total path loss
255.0
dB
Gas rate 0.0499 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 14.9 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
-255.0
dB
RX antenna gain
30.0
dBi
RX power
-177.0
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-37.0
dB
Path weather · HRRR average of 9 samples
Temperature
69.2 °F
20.7 °C
Dewpoint
63.8 °F
17.6 °C
T/Td gap
5.4 °F
3.0 °C
Abs. humidity
14.9
g/m³
Pressure
988.0
mb
PWAT
40.2
mm
BL depth
699.8
m AGL
Refrac. gradient
-63.7
N/km
Propagation factors · 24 GHz
51/100
Rain
100
14%
Humidity
0
13%
PWAT
15
11%
Season
47
11%
T-Td Depression
38
10%
Refractivity
55
10%
Pressure
82
10%
Sky Cover
50
8%
Wind
50
8%
Time of Day
18
4%
Atmospheric profile
HRRR 3 km
Valid 2026-05-10 21:00 UTC
· 9 samples
Point
Lat, lon
Temp
Dewpt
Press
dN/dh
BL m
PWAT
Duct
Source
33.5, -97.3
22.1 °C
16.1 °C
988.0 mb
-61.7
937.3
36.5 mm
—
13%
33.4, -97.2
22.1 °C
16.1 °C
988.0 mb
-61.7
937.3
36.5 mm
—
25%
33.4, -97.1
21.8 °C
18.3 °C
994.4 mb
-49.4
719.2
39.1 mm
—
38%
33.4, -97.0
20.3 °C
18.2 °C
993.8 mb
-54.6
627.9
39.6 mm
—
Midpoint
33.3, -97.0
20.4 °C
18.0 °C
995.5 mb
-51.5
636.7
42.0 mm
—
63%
33.3, -96.9
20.4 °C
18.4 °C
996.8 mb
-52.6
857.5
43.0 mm
—
75%
33.2, -96.8
20.2 °C
18.1 °C
993.1 mb
-56.4
659.9
44.6 mm
—
88%
33.2, -96.7
19.5 °C
17.9 °C
992.5 mb
-63.7
466.5
40.1 mm
—
Destination
33.1, -96.6
19.4 °C
17.8 °C
995.0 mb
-62.2
456.2
40.3 mm
—
Midpoint vertical profile
17-hour forecast · this path · 24 GHz
→ steady
Peak 63
at 13:00 UTC
· low 41
at 02:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 21:00 | 46 | POOR |
| 22:00 | 47 | POOR |
| 23:00 | 50 | MARGINAL |
| 00:00 | 47 | POOR |
| 01:00 | 49 | POOR |
| 02:00 | 41 | POOR |
| 03:00 | 50 | MARGINAL |
| 04:00 | 54 | MARGINAL |
| 05:00 | 54 | MARGINAL |
| 06:00 | 55 | MARGINAL |
| 07:00 | 56 | MARGINAL |
| 08:00 | 55 | MARGINAL |
| 09:00 | 59 | MARGINAL |
| 10:00 | 60 | MARGINAL |
| 11:00 | 60 | MARGINAL |
| 12:00 | 62 | MARGINAL |
| 13:00 · now | 63 | MARGINAL |