Spanline Microwave Path Design Launch app

Pathloss 5 .pl5 import & export (round-trip)

File → Open .pl5… reads a Pathloss 5 binary link file directly in the browser. If the open project already contains path data, Spanline prompts whether to merge the imported hop into the current project or replace the project cleanly.

After import, Spanline summarizes the imported site, equipment, and profile records. The terrain and clutter profile stored in the .pl5 is displayed immediately, and the geodesic path length recomputed with Vincenty on WGS84 is compared against the path length stored in the file (flagging any discrepancy greater than 1 m).

Imported parameters

Site names, call signs, WGS84 coordinates, ground elevations, and tower heights.
Hop radio parameters, operating frequency, antenna models, centerlines, and transmission line losses.
Vigants–Barnett climate factor, Crane rain region, dispersive fade occurrence factor, ITU-R P.1510-0 annual temperature, and the 840-byte terrain roughness extent trailer.
Full point-by-point terrain elevation and clutter/obstruction profile stored in the .pl5 file.
Polarization (horizontal or vertical), preserving the imported setting and defaulting new hops to horizontal when unspecified.

Round-trip .pl5 export & .rsd radio libraries

File → Export .pl5 writes a native Pathloss 5 .pl5 file from the active hop—patching imported .pl5 structures in place for full round-trip fidelity with Pathloss 5 or generating a clean binary .pl5 file for hops created from scratch in Spanline. In addition, File → Import .rsd… imports Pathloss radio equipment data files directly into the equipment catalog.

Reference validation benchmark (Byhalia / College & Bethel)

On the standard Byhalia (College & Bethel) reference .pl5 path, Spanline reproduces Pathloss 5's free-space loss (127.83 dB), net path loss (58.32 dB), receive signal level (−31.32 dBm), and thermal fade margin (17.28 dB). See the link budget method page for the full propagation equations and constants.