U2.Callbook

U2.Callbook (Callsign Lookup Service)

U2.Callbook is a high-performance local database utility and lookup service that manages radio amateur callsign information, designed to eliminate latency during live operations.

Offline & Network Capability

Equipped with a local SQLite database that supports FTS5 full-text indexing, U2.Callbook allows you to perform lightning-fast searches locally without needing an active internet connection. To serve the rest of the shack, it hosts an embedded TCP server allowing all other software in the U2.Suite (like U2.Log or U2.RemoteControl) to query callsign details dynamically.

Key Features

• FTS5 Search Indexing: Search prefixes and partial callsigns instantly.
• TCP Query Protocol: Listens securely on port 50010 with IP whitelisting and API key security.
• Online API Failover: Queries external services like QRZ.com via their XML API if a callsign is not present in the local database, caching the result.
• Bulk Data Importers: Easy integration tools for importing massive third-party databases via CSV or ADIF.