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domain	foxdog.blog
summary	Summary: - Introduction to TETRA: - TETRA (Terrestrial Trunked Radio) is an international standard for digital trunked mobile radio communications. - It's designed for public safety, transportation, and industrial users requiring secure, reliable, and efficient communication. - Key features include: - Trunking: Dynamic channel allocation for efficient use of spectrum. - Security: Encryption for voice and data transmission. - Group calling: Ability to communicate with predefined groups. - Short Data Service (SDS): Transmission of short messages. - Physical Layer Part 1: - TETRA operates in the VHF (Very High Frequency) band, primarily around 450 MHz. - It uses Time Division Multiple Access (TDMA) to divide channels into time slots for multiple users. - Key aspects include: - Frame structure: Each frame consists of four time slots. - Channel coding: Convolutional encoding is used to protect data from errors. - Modulation: Gaussian Minimum Shift Keying (GMSK) modulation is employed.
title	Ret's Blog
description	Thoughts of an Internet Folf, into electronics, software, radio and more
keywords	tetra, introduction, lower, part, info, dumping, layer, march, skip, main, content, level, navigation, menu, home, feed, posts
upstreams	11tybundle.dev
downstreams
nslookup	A 18.67.240.127, A 18.67.240.25, A 18.67.240.22, A 18.67.240.95
created	2025-03-16
updated	2025-04-21
summarized	2025-04-21