EA4FSI · RADIO & NETWORK UTILITIES

TOOLS

A collection of practical radio, networking and language-learning resources developed and maintained by EA4FSI.

Radio

Convert geographic coordinates into a Maidenhead grid locator.

Calculate great-circle distance and antenna headings between two stations.

Calculate coaxial cable attenuation, efficiency and power delivered to the antenna.

Monitor space weather and HF radio propagation conditions.

Check current time across selected time zones around the world.

View information associated with your current public IP address.

Convert CIDR prefixes and subnet masks and inspect IPv4 network details.

Inspect how an IP address or network is seen through RIPE RIS BGP viewpoints.

Advanced C1 English learning resources created for Spanish speakers.

Introductory A1 Arabic learning resources created for Spanish speakers.