For newly developed remote control transmitter or receiver project, we always recommend our customer to use 433.92Mhz frequency or known as 433Mhz or 434Mhz in some places, as there are many advantages for choosing this frequency. When starting a remote control transmitter and receiver project, most times customer won’t ask which frequency to use, as …

Here are some common questions asked regarding FCC ID testing for typical RF remote control transmitter, should you have any questions, please let us know. Q1 – What is the difference between intentional and non-intentional radiation? A1 – An intentional radiator, normally known as transmitter, radiates a controlled frequency. An non-intentional radiator radiates unwanted RF …

This blog post will focus on FCC ID testing for short range remote control transmitters, or known as SRD – short range devices, these devices mainly work on ISM frequency band, and these remotes will need to be tested in regulatory labs before legally sell on market, for USA market, the test labs would be …

During recent development project on FCC certified remote control transmitter and relay receiver kit, we have found our PT4302 superheterodyne receiver module becomes unstable or impossible to decode transmitter data when data rate is set to more than 5kbps, after hooked up undecoded data stream from receiver module on oscilloscope, we have found the reason …

Customer always has minimum operating distance requirement when we design RF remote controls, sometimes customer will require line of sight distance of approx. 200 meters or more, so aside from using high sensitivity remote control receiver module, we also have to make sure that transmitter side has enough transmit power. But the problem is, FCC …

For legally distribute in USA and Canada market, RF remote control transmitters must be certified by FCC approved labs and get a FCC ID, the testing procedure can be carried either by manufacturer in China or by seller in USA. The major remote control parameter that FCC require is simply limit RF transmission power in …

In the beginning of post, we should note that the conclusion in blog series is only suitable for sub-GHz remote control loop antenna design – mainly in 290 – 915 Mhz range, having the most popular ISM range included. In previous second part of this blog series, we have concluded that the remote control PCB …

Sometimes calculating PCB small loop antenna parameter and design corresponding small impedance matching loop can be time consuming, so we have made a excel spreadsheet to automate the process. Please find attached document named Loop_Antenna_Calc_1312.xls for details, and welcome to provide any suggestions in our discussion form below if possible. Loop_Antenna_Calc_1312.xls (41.50 kb)

The second part is about how to determine the antenna shape on board, is there any principle to make sure final remote control outputs maximum power? One of the major points we should care about is called antenna efficiency, which measures how much percent of power actually radiated in total power attached to loop antenna. …