After working successfully on my first transceiver, I started souring for other transceiver for research purpose. It is at that time, I have noticed that some of the transceiver have similar specification. The circuit layout is compared and found very similar in various area. After further investigation, the IC chip they used in the PCB is the key to building this transceiver.

The circuit is simple and is mainly operated by the IC on the PCB board. It is actually originated from nRF401 IC from Nordic Semiconductor ASA.

The testing of the RF module couldn't have taken place without the development of my own dc-dc converter. Commercial module is available but cost is high. Voltage regulator is necessary for most electronics circuits project. Therefore learning to build a dc-dc circuit from discrete components is worth the effort.

Schematic for Data Encoder MC145026, Decoder MC145027.

2006-03-xx: There is a problem that was found during the attempt to use this design on my robot. The wire link from the transceiver and the decoder IC cannot be too far apart. Data error rate seems to be very high, and reception is very poor. It could be due to the weak signal strength, which should be resolve by using a digital buffer. The signal is digital from the output of the transceiver. If it is a transmission issue, then it will be quite difficult to troubleshoot without proper equipment.

During my work in Teleradio Engineering, I am task to research in the area of magnetic field. Eventually some ideas were came up with to test out on radiated electromagnetic field. Electromagnetic field is simply the energy form by magnetic and electric field. The theory details on electromagnetic field is very mathematically intensive as what I had go through during my diploma and degree courses. However the concept is actually quite simple. Mathematics is simply one of our human language which can accurately be used to describe the physical property of electromagnetic. The deriving of the mathematics has gone through a lot of work. Eventually electromagnetic can be accurately predicted by the famous Maxwell Equations.

Wow, you may think, four simple equation and they have describe almost over 90% of electrical and magnetic phenomenon. These four equation are headache to study.

Electromagnetic theory is a form of geometry mathematics. If you can understand the concept of volume, area and vector in school, you have the potential to master this subject. It is not as difficult as it seem to be. You will have to apply some imagination and interpret the electromagnetic concept because these thing is physically not visible.

A book that have great influence in my understanding in electromagnetic is "Electromagnetism for Engineers (An Introductory Course) 3rd Edition by by P.Hammond (University of Southampton, Southampton UK)". This book is fully recommended for beginners like me, as it has minimum mathematics which is very easy to read and understand. Most importantly, the book is thin and have sufficient pictures illustration.

Electromagnetic theory is a very useful in practice. The learning experience is applicable to a lot of engineering problem. I had manage to apply the knowledge to resolve lightings issue during my research work in Teleradio Engineering. It all started when I was confronted with my first commercial system (UV3, Under Vehicle Surveillance System) that I build for the company. A new chassis design were already in place before I join the company. After a test run, it is found to have lighting problem. The lighting positioning is wrong, resulting in dark images captured. We have to resolve this immediately because the delivery date to our oversea buyer is near. I am confronted by a problem which I was not trained to resolve in school. Number of simple reflector were made for testing but it does not seems to work well. I decided calm down and rethink the problem all over again. All our office's fluorescence lighting were switch off. The bulb is being switched on, as I observed the bulb glow, the radiation pattern of the bulb. Within the next few moment, electromagnetic concept surface in front of my mind. I had come up with a simple custom reflector design base solely on the radiation pattern and managed to resolve the lighting issue for delivery. Although the concept of reflector is quite simple, it took me over a year to be able to understand and explain the lighting's intensity distribution from all the various reflectors I have designed. I have spent much of my time in Teleradio doing reflector design and lightings research for camera vision.

The illustration of the light radiation from a bulb is very much similar in a way to electromagnetic theory.