Napa County, California, is famous for its hillside vineyards. Public agencies in this beautiful district were struggling with an outdated radio network, and turned to a Tait solution for greater coverage and system reliability.
As the 2018 year comes to a close, we look back on some of the highlights for Tait and the critical communications industry. Ranging from monumental contracts, product releases, insights, and green innovations, 2018 has been busy and exciting across the board. We would like to share these moments with you, and revisit some of your favorite stories from this year.
Tait has long been regarded as a trusted supplier of DMR Tier 3 networks and solutions. We were among the first to take Tier 3 solutions to market, and we are... 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... 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... 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... 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