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NTMS Propagation Path calculator

Path Calculator

Point-to-point prediction over HRRR profiles, SRTM terrain and ITU-R P.676 / P.530.

32.7, -97.0 · EM12mq · 8.0 ft AGL

33.1, -96.6 · EM13qc · 30.0 ft AGL
A callsign resolves through QRZ's mailing address, then geocoding — the position may be off from where the station actually operates.
Band
Station

Path calculation complete.

HRRR 21:00z · 9/9 path points
Distance
59.2
km · 36.8 mi
Bearing
32.0°
true · rev 212.0°
Terrain
BLOCKED
83.9 dB diffraction
Propagation
54/100
MARGINAL
Margin
-32.3
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 volume34 m AGL at the midpoint (103 m above the chord, 52 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 9.7 m) clears with margin. The geometric line of sight is obstructed — buried 40 m below terrain at its worst point.

Great circle
32.669, -96.953 → 33.12, -96.615 · 32.0°
Loss budget · 47 GHz
FSPL (free-space) 161.3 dB
Gaseous (O₂ + H₂O) 5.0 dB
Diffraction 83.9 dB
Rain attenuation 0.0 dB
Total path loss 250.3 dB
Gas rate 0.0847 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 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 -250.3 dB
RX antenna gain 30.0 dBi
RX power -172.3 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -32.3 dB
Path weather · HRRR average of 9 samples
Temperature
69.6 °F
20.9 °C
Dewpoint
63.8 °F
17.7 °C
T/Td gap
5.9 °F
3.3 °C
Abs. humidity
14.9
g/m³
Pressure
993.4
mb
PWAT
39.2
mm
BL depth
480.0
m AGL
Refrac. gradient
-73.4
N/km
Propagation factors · 47 GHz 54/100
Rain
100 14%
Humidity
32 13%
PWAT
35 11%
Season
55 11%
T-Td Depression
38 10%
Refractivity
55 10%
Pressure
70 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 32.7, -97.0 22.3 °C 17.7 °C 996.8 mb -53.8 507.0 44.6 mm
13% 32.7, -96.9 22.4 °C 17.9 °C 997.1 mb -59.1 505.2 38.6 mm
25% 32.8, -96.9 22.4 °C 17.9 °C 997.1 mb -59.1 505.2 38.6 mm
38% 32.8, -96.8 22.3 °C 17.4 °C 999.1 mb -64.4 491.9 38.1 mm
Midpoint 32.9, -96.8 20.7 °C 17.6 °C 998.3 mb -73.4 433.5 37.3 mm
63% 33.0, -96.7 19.7 °C 17.5 °C 993.4 mb -63.8 482.7 37.7 mm
75% 33.0, -96.7 19.7 °C 17.5 °C 993.4 mb -63.8 482.7 37.7 mm
88% 33.1, -96.7 19.4 °C 17.8 °C 995.0 mb -62.2 456.2 40.3 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 · 47 GHz → steady
Propagation score for this path over the next 17 hours. 0 25 50 75 100
Peak 60 at 13:00 UTC · low 45 at 02:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
21:00 52 MARGINAL
22:00 50 MARGINAL
23:00 51 MARGINAL
00:00 53 MARGINAL
01:00 54 MARGINAL
02:00 45 POOR
03:00 50 MARGINAL
04:00 56 MARGINAL
05:00 55 MARGINAL
06:00 54 MARGINAL
07:00 54 MARGINAL
08:00 54 MARGINAL
09:00 55 MARGINAL
10:00 57 MARGINAL
11:00 56 MARGINAL
12:00 56 MARGINAL
13:00 · now 60 MARGINAL