This is an unique project is one of the most trusted homemade test instruments to have, once you get your FM transmitter up and running. This simple little device (the Switchable RF Probe-Watt Meter), is capable of finding your FM transmitters : Unloaded RMS Output Voltage Loaded RMS Output Voltage Output Impedance Output Wattage Construction of the Switchable RF Probe/Watt Meter Print out the PCB template to the left. From the left to the right of the PCB template. Begin [...]
Here is one of the most trusted homemade test instruments to have, once you get your FM transmitter up and running. For sustained loads of up to 2 watts. This simple little device is capable of finding your FM transmitters: unloaded RMS output voltage, oaded RMS output voltage, output impedance, and output wattage. Switchable RF Probe/Watt Meter Construction First, print out the PCB template to the left. Send the picture to a graphics program, such as Paint, and squeeze and/or stretch [...]
This circuit is an RF probe that is used to directly measure the level of RF voltage present at a particular point and is one of the most useful test instrument in the hands of the home brewer. This RF Probe is normally used with a digital multi meter to indicate the voltage level as dc voltage which is equivalent to the RMS value of the RF voltage being measured. However, the level of RF voltage being measured provides useful information only when the probe has been designed for use w [...]
The dummy load circuit described here is capable of handling up to 10 watts of RF power for a couple of minutes, and is designed for the widely used 50 ohms impedance. It consists of ten parallel connected 560 ohms 1 watt resistors, R1 through R10, a voltage divider, R11-R12, and a rectifier D1-C1. Apart from loading the transmitter output with a minimum of reflected power, the dummy load also provides a direct voltage output to which a voltmeter may be connected to measure the RF powe [...]
This rf power amplifier design for a 2.5 Watt power amplifier for the FM band. An input of 50 mW gives a final output power of 2.5 Watts with a 13 Volt supply. The best bit is that the amplifier requires no tuning once it's built - it gives roughly the same gain and output power right across the FM band from 88 to 108 MHz.There's even some hefty output low pass filtering to make sure that harmonic output is small and no interference is caused to users (mostly military!) on multiples of [...]
This RF amplifier for FM 88-108 MHz with no tune (broadband) needed to cover all the FM Band. You need the 2N3866 driver stage to boost properly the BLV10 transitor. All the impedance networks (Input-Output) of this RF amplifier have been determined by using the softwares: Mimp.EXE - Genesys. RF FM Power Amplifier Schematic-PCB Due to the good harmonic rejection of the RF amplifier design, a low pass filter is not necessary. Or you can download RF Filter Design AADE and RF Filter Desig [...]
How to build and improve rf transmitter AM-FM-TV Transmitter