As discussed in our previous blog post, the Transient Adjacent Channel Power (TACP) is simply an extension of the ratio of the energy produced in the wanted and adjacent channels when the Transmitter is keyed up or down. In reality, the unwanted energy produced by the Transmitter doesn’t just spread into the adjacent channel, it also spreads out far beyond that point. Tx Noise, therefore, is a measure of the unwanted transmitted energy at some specified offset from the wanted frequency.
Eventually, as we go further and further away from the carrier, the... Continue Reading
Great news everyone! The Tait Radio Academy has launched another new course: Introduction to Intrinsically Safe Radios.
A number of different standards worldwide help guide manufacturers, purchasers and users in the design, manufacture, selection and operation of IS radios. This course will help you to interpret these standards, based on their location in the world, and the environment under which the IS radios will be used.
The course contains 7 different videos, all taught by Stuart Colsell, a Senior Systems Engineer at Tait... Continue Reading
Adjacent Channel Power (ACP) is basically the ratio of the energy produced in the wanted and adjacent channels when the Transmitter is in steady state mode. Transient Adjacent Channel Power (TACP) is simply an extension of this, being the ratio of the energy produced in the wanted and adjacent channels when the Transmitter is keyed up or down. Transient ACP is measured in the frequency domain. A related parameter “Transient Behaviour” is measured in the time domain.
When the transmitter is keyed up or down (in other words, the user... Continue Reading
Before explaining Adjacent channel power, it is necessary to make mention of Electrical Noise. This subject will be covered more deeply later, but for now understand simply that noise, as it relates to communications systems, is defined as an unwanted random fluctuation in an electrical signal.
As we have seen previously, the Tx signal is produced by a locked oscillator within the Synthesizer. However, the output produced by such oscillators is not totally “clean.” That is to say that it does not just contain energy at the wanted frequency (the... Continue Reading
The Frequency Stability of a Transmitter is a measure of how close the actual frequency transmitted is to the wanted.
Frequency Stability is directly determined by the Crystal Oscillator, as all frequencies produced in the Synthesizer are locked to this reference. Frequency Stability is generally quoted in Parts per Million (ppm) but can sometimes be quoted as a discrete number of Hertz (Hz). The difference between the wanted frequency and that actually produced is known as the Frequency Error or Frequency Drift.
To illustrate this, consider the diagram... Continue Reading
We’re at the end of a 3 part series on RF Performance with Ian Graham, Principal Engineer for the Systems Engineering group. In the first video, Ian defined the different specifications for RF Performance. In the second video, he discussed RF performance for Transmitters.
In this final video, Ian defines the specifications of receivers. Ian delves into the desired performance aspects, regulations, and system costs. Ian also talks about the benefits a customer will receive by choosing a system that supports better RF performance, and how to identify that performance in... Continue Reading
We’re in the middle of a 3 part series on RF Performance with Ian Graham, Principal Engineer for the Systems Engineering group. In the first video, Ian defined the different specifications for RF Performance, such as reliability vs cost, the minimum acceptable performance by the regulatory authorities, and how Tait exceeds these levels of performance.
Today we’ve got video two of the series, where Ian explains the key RF specifications for transmitters. In this video, Ian delves into adjacent channel power and how sideband noise can affect neighboring receivers,... Continue Reading
Inspired by the 1974 Commonwealth Games Marathon, the Christchurch Marathon, established in 1981, had been a highlight on the South Island calendar for more than 30 years. However, when a devastating earthquake struck the city in 2011, the marathon was a part of city life that seemed lost for good.
In order to get the popular event back on its feet, organizers called on local firm Outback Communications to ensure the experience and equipment was available to keep communications for the sprawling event coming through loud and clear.
As communications provider,... Continue Reading
One of the great advantages of choosing Tait is our RF Performance. We pride ourselves in both transmitting and receiving technology, and this series will look at the technical data that demonstrates why.
We recently interviewed Ian Graham, Principal Engineer for the Systems Engineering group, about RF Performance. The results of the interview were three videos which will be shared here over the next few weeks. At the end of the series, you should be able to look at specification sheets for different products and determine for yourself which one has an RF performance... Continue Reading
Tait has released an exciting new system with TaitNet Analog Simulcast IP (AS-IP).
Labelled as “the best migration path in town”, AS-IP offers an easy upgrade path for customers who want an analog system today, but who may wish to consider a future migration to P25 standards. Customers with existing analog products are able to retain their hardware and related simulcast software, and need only activate additional feature licenses to become fully P25-capable.
Due to TaitNet Analog Simulcast IP’s simple upgrade path and outstanding... Continue Reading