Diy Rf Signal Generator

The first change i made was to use a common cathode varactor diode instead of a common anode varactor diode.

Diy rf signal generator.

It is based on a wonderful chip motorola developed in the 1970s. Those instruments ended up with somewhat different oscillator designs due to other conflicting design issues. It can be useful for amplifier testing experimentation in digital signal processing dsp and electronics labs. The author s rf generator used multiple transformers to deliver a variety of voltages.

This vco is made up of op amps u3a and u3b where u3a is configured as an integrator and u3b is configured as a schmitt trigger. The device is very basic but suits my needs to test the band pass filters and the receiving unit of my rig. Hi welcome to my design for a simple and cheap rf signal generator with both am and fm modulation. The version i built was to fill in the gaps not covered by my old commercial unit and also provide an item of test equipment in its own right.

This is used as the signal source to drive the impedance bridge and detectors used to measure impedance. This is a simple function generator that works in the audio frequency range. The rf signal generator is a must to have tool when playing with radio receivers. The case i had was a little bit small and i decided i d try to redesign the circuit to use only a single center tapped 24 vac transformer.

Referring to figure 1 the heart of this generator is the rf deck. Very useful feature of the rf signal generator is its modulation capability. The signal generator outlined here is much simpler and quite easy to build. The first stage of the signal generator is a vco which stands for voltage controlled oscillator.

Author s prototype for arduino based frequency generator. Those instruments both include an rf signal generator. It is used to tune a resonant circuits and adjust the gain of different rf stages. As built the frequency range mine covered was 16khz to 54 mhz although with suitable coils it should work from as low as 5khz to over 100mhz.

The mc1648 an ecl oscillator chip in a 14 dip package with built in automatic gain control agc.