Tw-x67 experiment box on the principles of communication systems
Use the tw-x67 communication lab to "live" the communications principles class
Teachers, colleagues, hello. I believe that in the course of the course on electronic communication in vocational colleges, we all share a common feeling: the theory of " the principles of communication " is abstract, with many formulas, and students learn to be bored. It is difficult for students to understand those wave shapes, coding and modulations if they rely only on books and ppts. Over the years, our faculty has been looking for an experimental device that both covers the core knowledge points and allows students to touch the signal. After repeated comparisons and teaching practices, we finally selected the tw-x67 principles test box. Today, i'll share with my colleagues the experience of using this device。
Tw-x67 experiment box: bridge from theory to practice
1. Hardware configuration to meet teaching needs
Open the lab box and see first that it provides a six-way straight-flow steady-voltage power source of ±15v, ±6v, ±12v, which means that we do multiple modular cascade experiments without additional external power supply, which is very convenient. The most visible of the boxes are eight digital tubes and 16 key-click thin film keyboards, which students can use to set the type of signal and toggle experiments to show the current state in real time, an interactive design that is intuitive。
The core circuit component, which uses multiple digital signals designed by cpcld to generate circuits, stabilizes the output of pseudo-random codes, special codes and synchronized swirling signals. For our teachings, reliable and stable signal sources are the first, otherwise students can be tested in an incomparable wave shape that can discourage motivation。
2. Experimental content systems covering core knowledge points
The most satisfying aspect of tw-x67 is that its experimental content is closely linked to the routing of the production of the educational material, the principles of communication, from the base to the composite layer. The complete equipment supports 33 pilot projects, which essentially cover all the core chapters of the course。
Independent circuit modules and accompanying experiments are available from base multiple digital signal generation, frame synchronous signal recognition, to core sample theorem, pulse range mode (pam), to complex pulse code modem (pcm), incremental modem (Δm), and psk/dpsk modems, hdb3 code variants, etc. Of particular note is the fact that it also includes eye map observation analysis and lock-ring performance testing, which are very important experiments in engineering practice。
Ii. Real experience in teach: why do i recommend the explor
1. Modular design for progressive learning
In practical teaching, i'm used to organizing experiments in the order in which "the signal produces the base belt to transmit the frequency band to the modulation system." the circuit modules of tw-x67 are clearly divided, for example, sample theorem and pam are a module, pcm compiles a single module, and psk modems are a module. The input-output interface for each module is clearly marked with a thread, and students need only connect to the diagram with a combination of a sublines, and then test the dot shape with a oscilloscope to visualize the theoretical wave shape and the actual circuit output。
It is recalled that, when speaking of sample theorems, students were previously unable to remember the meaning of “sampling more than twice the frequency of signals”. Now, on the experiment box, students can adjust their own chord frequency, change the pulsation frequency of the sample, and clearly see the phenomenon of “mixing distortion” on the oscillator, which is more effective than any formula。
2. Closer engineering, professional development
The aim of vocational colleges is to enable students to adapt quickly after graduation. The tw-x67 experiment box is well thought out in this regard. First, it supports the completion of the single-manufacturing communication system experiment in single-manufacturing laboratories, and the on-line implementation of double-work communication in two experimental boxes, where students can be connected to understand the full process of voice signals from “transmitting magnified encoded transcoding channel transfer decodering filters”。
In addition, the experiment box has been equipped with a single telephone interface to match the external telephone, which allows students to build a micro-point-to-point voice communication system. That sense of achievement is real when they use their own voice, go through their own chains and hear each other's voices clearly. Several students of our school electronics association, even using two test boxes and two telephone sets, simulated a small intra-campus communication demonstration system in a hands-on room, which, although simple, clearly took a step up their understanding of the overall structure of the communications system。
Iii. Some recommendations for use by peers
If you are also prepared to introduce this experiment box, i would like to make two small suggestions: first, that students must spend time familiarizing themselves with the operation of keyboards and digital tubes, which is the key to controlling the state of the experiment, and that many students are not used to it at first and are prone to errors; and second, that double-trace wavers above 20 mhz must be equipped because many of the experiments need to observe both encoded input and output waves at the same time, and that double-trace comparisons are much better。
In short, the tw-x67 experiment box, which has been in use in our faculty for two years, has indeed addressed the pain of teaching “theory, light practice” of communication principles. It transforms abstract communication principles into a tactile and testable circuit module that simultaneously increases the skills and confidence of students. I am also encouraged to be kept in touch if there is any doubt as to the organization of the pilot guide or the development of specific experiments on the equipment。
All you have to do is call: 021-55884001
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