We’ve recently redesigned our White Paper Library, making it even easier for you to find the information you need. The Tait White Paper Library can now be browsed by industry or technology, and all papers are free to download! Continue Reading
Despite the digital communications revolution, a significant number of LMR operators continue to specify modern analog radio networks to serve their communities. Many others are successfully operating legacy analog LMR systems that continue to be optimized and fully supported. Beyond their support role, some manufacturers are developing solutions that upgrade the performance of these analog networks, giving existing and new analog operators ongoing value for the life of the network investment. When considering radio network design, acquisition costs,... Continue Reading
What is Simulcast?
Simulcast is a technique that allows wide area coverage to be achieved with a single radio channel (a single frequency pair). Normally, all sites in a radio system in the same geographic area transmit using different frequencies to minimize interference. With Simulcast, each site uses the same set of frequencies. Close control of the frequency error, transmit power and timing of the transmissions from each site are used to minimize interference.
Why use Simulcast in the city?
- If the 4 sites used to cover the city were non-simulcast, the terminals would be... Continue Reading
In the first part of this series, we explained the two main types of digital modulation, Phase Shift Keying (PSK) and Frequency Shift Keying (FSK) with an example of each – Linear Simulcast Modulation (LSM) – a type of PSK, and Continuous Four Frequency Modulation (C4FM) – a type of FSK. We also compared the spectral efficiencies of LSM and C4FM. In this part, we compare the costs and effect of delay spread of the types of digital modulation.
Effect of delay spread
Most digital radio modulation types are based on either Phase Shift Keying (PSK) or Frequency Shift Keying (FSK). Tait Principal Engineer Ian Graham is often asked about their relative advantages and disadvantages, so in this article he sets out to explore the subject.
To make it ‘real’, we will compare two actual modulation schemes: Linear Simulcast Modulation (LSM) – a type of PSK, and Continuous Four Frequency Modulation (C4FM) – a type of FSK. We will describe them, cover their relative advantages and disadvantages, then use an example simulcast system to show a practical comparison. Continue Reading
In this last part of the P25 glossary, we cover squelch, simulcast, VoIP and many other essential P25 terms.
A TaitNet channel group member that has delegated voting activity to a central voter. Continue Reading
I recently drove to a friend’s house and attempted a short cut. Unfortunately, I started by making the wrong turn. I ended up in a place I was unfamiliar with, but kept guessing the general direction of my destination. After a while, I literally found myself on the complete opposite side of town.
So much for finding a short cut.
If your first... Continue Reading
In this part of the P25 radio terminology, we cover multicast IP address, P25 gateways, QoS and other important P25 terms.
Link Data Unit. Voice calls are sent over the CAI as a series of LDUs. Continue Reading
Previously, we covered the essential P25 terms from A to C. Continuing our series on must-know P25 radio terms, this week we bring you the second installment.
The data gateway is a function carried out in a Tait P25 base station or P25 console gateway operating in a TaitNet P25 conventional network. It provides a gateway between P25 radios and a data server and requires the Conventional Packet Data Services feature license. Continue Reading
We are happy to announce the launch of our P25 Best Practice website complete with the first four P25 Best Practice guides: