Jewels Rain

Jewels Rain is a focused offline tool for estimating signal attenuation across cable routes.

Build a route from multiple cable sections, add connector insertion losses, and compare two alternatives side by side. Save each calculation as a technical card and maintain a local library of custom cable profiles with frequency-based attenuation tables.

Key features:
• Total loss by cable length and operating frequency
• Linear interpolation between cable attenuation data points
• Separate Route A and Route B comparison
• Connector and adapter insertion losses
• Built-in and custom cable profiles (RG-58/U, RG-213/U, LMR-400, CAT6 and more)
• Autosaved drafts and reusable technical cards
• JSON backup, restore, and technical-card export
• Metric and imperial length units
• Light, dark, and system themes
• Fully offline operation with no account or internet permission

Calculated values depend on the quality of the attenuation data entered by the user and do not replace field measurements for safety-critical or certified installations.