What is TIA/EIA-603 Standard and Why is it Important for Land Mobile Radio?
TIA/EIA-603 is a standard developed by the Telecommunications Industry Association (TIA) and the Electronic Industries Association (EIA) that specifies measurement and performance criteria for land mobile FM or PM communications equipment. It covers equipment operating in frequency bands from 25 MHz to 1000 MHz, with channel spacings of 12.5 kHz, 25 kHz, or 50 kHz.
The standard defines various parameters such as frequency stability, modulation fidelity, occupied bandwidth, spurious emissions, sensitivity, selectivity, intermodulation rejection, audio response, audio distortion, and subaudible tone signaling. It also provides test methods and procedures for measuring these parameters.
tia eia 603 pdf 38
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TIA/EIA-603 is important for land mobile radio because it ensures interoperability and compatibility among different equipment manufacturers and users. It also helps to maintain a high level of quality and reliability for land mobile radio systems. By following the standard, equipment manufacturers can demonstrate compliance with the Federal Communications Commission (FCC) rules and regulations for land mobile radio services.
One of the features of TIA/EIA-603 is that it specifies required CTCSS performance levels and subaudio tone set (38 supported out of the 39) for equipment using continuous tone-coded squelch system (CTCSS). CTCSS is a technique that allows multiple users to share the same radio channel without interfering with each other. Each user is assigned a different subaudible tone that is transmitted along with the voice signal. The receiver only opens the squelch when it detects the matching tone from the transmitter.
TIA/EIA-603 was first published in 1995 and has been revised several times since then. The latest revision is TIA/EIA-603-E(2016), which incorporates changes from previous addenda and errata. The standard also references other TIA standards for narrowband analog and digital equipment, such as TIA-102.CAAA-E(2016) for Project 25 Phase 1 Common Air Interface.
TIA/EIA-603 is available for purchase from the TIA website[^1^] or from other online sources[^2^]. It is also included in the NTIA Manual of Regulations and Procedures for Federal Radio Frequency Management[^3^], which provides guidance on spectrum standards applicable to federal radio stations and systems.
In addition to TIA/EIA-603, there are other standards that apply to land mobile radio equipment and systems. For example, TIA-603-D(2010) is a standard for land mobile FM or PM communications equipment measurement and performance standards for narrowband digital systems. It covers equipment operating in frequency bands from 30 MHz to 1000 MHz, with channel spacings of 6.25 kHz or 12.5 kHz. It defines parameters such as modulation accuracy, bit error rate, symbol deviation, adjacent channel power ratio, and transmitter intermodulation.
Another example is TIA-102.BAAA-A(2007), which is a standard for Project 25 Phase 1 FDMA common air interface. It covers equipment operating in frequency bands from 136 MHz to 870 MHz, with channel spacings of 12.5 kHz or 25 kHz. It defines parameters such as modulation type, data rate, frame structure, vocoder type, encryption type, and signaling protocol.
These standards are also available for purchase from the TIA website or from other online sources. They are also referenced in the NTIA Manual of Regulations and Procedures for Federal Radio Frequency Management.
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