Mutchus

RF Generator 6 GHz Circuit Diagram. When we talk about high-frequency, everything seems to be difficult, a simple coil becomes a feat. Doing a search on the Internet found that generator "comb" (comb generator), which is a signal generator that produces multiple harmonics of your input signal. The appearance of the output on a spectrum analyzer resemble a comb, hence the name. Comb generators are simpler to build and seem to work well up to 1 GHz This generator I found surprised me because he was 6 GHz has a crystal oscillator 96 MHz (third overtone), capacitively coupled to a broadband amplifier using IC mar3 and capacitively coupled to a back-to-back diode set low capacitance PIN. According to the creator of this circuit was originally designed to produce a reference signal in the amateur radio band of 2.4 GHz, hence the 96.013 MHz crystal RF Generator 6 GHz Circuit Diagram

A noise generator with a wideband output signal is always handy to have around when you're adjusting receivers and other types of HF equipment. Simple RF Noise Source Circuit Diagram: The noise generator circuit described here uses the base-emitter junction of a transistor (in this case a 8Fl99) operating under reverse bias. As a result, it acts as a Zener diode and generates a wideband noise signal. The noise signal passes through a 1-nF capacitor to the output connector (female BNC), which means that its low-frequency components do not appear at the output. The 47-Q resistor gives the noise generator an  output impedance of nearly 50 Q.  You can easily fit the entire noise generator in a small metal enclosure equipped with a BNC connector. The supply voltage is not critical; anything in the range of 8 to 15 V will do.   Author : Fred  Brand - Copyright : Elektor

The circuit above is a dummy load capable of handling up to 10 watts of RF power for a few minutes, and its impedance is 50 ohms. It is constructed with 10 parallel resistors 560 ohms per 1 watt, R1 to R10, a voltage divider R11-R12 and a rectifier D1-C1. Its output voltage in a voltmeter which can be connected to measure the RF power.

The RF sweep frequency generator (‘wobbu-lator’) published in the October 2008 issue of Elektor has a receiver option that allows the instrument to be used as a direct conversion receiver. This receiver does however have a noise floor of only –80 dBm, which really should have been –-107 dBm to obtain a sensitivity of 1 µV. So, for a good receiver sommore gain is required. A wideband amplifie however, generates a lot of additional noisas well and as a consequence will not resuin much of an improvement.  As an experiment, the author developed a selective receiver with a bandwidth of about 4 MHz. Because a gain of at least 35 dB is required, the preamplifier consists of two amplifying elements. The input amplifier is designed around a dual gate MOSFET, type BF982. This component produces relatively little noise but pro-vides a lot of gain. The output stage uses a BFR91A for some additional gain. Preamplifiers where both the gate and the drain are tuned often struggle with feedback via the...