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The same applies for antennas: at 433Mhz a 1/4 wave antenna is only 17cm long. On the good side, UHF inductors are of low values and are usually air-core and made with few turns of wire or even printed on the PCB. To avoid crosstalk between traces & ground loops UHF circuit must share a common ground plane (eg:,double sided PCB) to which all ground points are connected ( ). You cannot use a solderless breadboard because it´s plagued with parasitic capacitances and inductances which at UHF frequencies (and VHF) behave as actual components. A single millimeter of wire or component lead is an inductor and affects the circuit. At these frequencies the physical layout of the components is crucial the same circuit may work or not depending on how it´s built. UHF comprises frequencies between 300Mhz and 3Ghz. At 433MHz, distance between nodes (0-crossing points) is 323mm on copper wire (half wavelength). Week Number Calculator Find the week number for any date. Weekday Calculator What Day is this Date Birthday Calculator Find when you are 1 billion seconds old. Date Calculator Add or subtract days, months, years. (3) check the frequency of the oscillator with a simple school ruler by measuring the distance between nodes (as did Ernst Lecher 120 years ago ). Time and Date Duration Calculate duration, with both date and time included. (2) its relative power output by the brightness of LED. In this chapter (1) I will show you this ultra-simple RF sniffer circuit with which you can visualize with an LED: It´s impossible to setup & adjust a RF transmit-receive link if you are not sure the transmitter is working properly.At 433MHz, your multimeter or even a regular oscilloscope are totally useless. I will be describing the making of a short/medium range RF remote-control using the UHF 433Mhz frequency.