Amateur Radio Receiver Circuits and Construction Projects
Find schematics, construction details, and modification guides for various ham radio receivers, from simple direct conversion to advanced SDR designs.
Receivers are at the heart of every ham radio station, allowing operators to hear signals across the bands. Many hams enjoy building their own receivers, from simple direct conversion designs for a single band to more complex general coverage units. These homebrew projects offer a deep understanding of radio theory and circuit design, often using readily available components to bring distant signals to life.
This category features numerous projects for homebrew receivers, including designs for specific bands like 30 meters or 40 meters, often optimized for modes like CW or PSK31. Operators can find schematics and construction details for direct conversion receivers, regenerative designs, and even modern SDR projects such as the OH2NLT Experimental Digital HF Receiver. There are also resources covering modifications for commercial receivers like the Realistic DX-100L and technical discussions on topics like receiver dynamic range.
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The direct conversion receiver described consists of only a bandpass filter, mixer IC, VFO and audio filter. With only 22 parts, this simple circuit should take a few hours at the weekend to construct. -
Practical and usable direct conversion receiver for the 40 m CW band -
The K9GDT 40m receiver -
A simple direct conversion receiver for 80m. The receiver covers 3.51 MHz - 3.60 MHz and 3.64MHz - 3.71 MHZ - CW and Phone portions by M0DGQ -
Using a full-size antenna and a reasonably sensitive headphone, this simple switching mixer will produce an amazing abundance of signals on 80m. -
A very simple receiver project by PA2OHH -
Circuit Diagram and Construction of the Bartling RX-40 Joachim Munch DF4ZS -
Christoph Petermann DF9CY DRM demonstration receiver project including Circuit Diagram and component list -
This is a compact three transistor regenerative general coverage receiver with fixed feedback -
The idea makes use of a very simple direct conversion receiver on the band of interest. -
Detailed plans of my homebrew receiver. Frequency coverage is from below 300kHz to 30MHz. Pictures, schematics, board layouts, parts lists and more can be found here. -
Schematic of a homebrew receiver and keying -
This page delves into the early history of radio and television, exploring the fascinating personalities and inventions that shaped the industry between 1870 and 1929. The author reflects on the pioneering work of figures like Thomas Edison, Guglielmo Marconi, and Nikola Tesla, highlighting the challenges and innovations that defined the golden age of radio. With a focus on a specific project involving a one tube AM radio, this article offers insights into the evolution of radio technology and its enduring impact on society. Ideal for hams and radio enthusiasts interested in the roots of modern communication. -
My first homemade SSB and CW receiver 10 kHz to 30 MHz -
The basics of radio receiver dynamic range performance used for specifying the performance of radio receivers used in radio communications systems. -
Modifications and improveents for the realistic DX-100L HF receiver by ON6MU -
Receiver dynamic range is the ability of a receiver to receive a weak signal without loss of readability while a strong signal is present. -
Key details about the superhet or superheterodyne radio reeiver: basic overview; how it works; applications; design notes, all you need to know. -
TenTec Receiver RX 320 D Review by DF9CY -
A led electroluminescent radio receiver -
Details the construction of 'The Virgin', a crystal-controlled direct-conversion receiver for the 40m band, completed in 2016. -
80 metre ceramix VXO with schematic and assembly instructions -
Two receivers compared, Drake R8A and Palstar R30 -
A schematic diagram of a homemade direct conversion receiver for 30 meters band -
A project with schematic to build a receiver for 80 meters band by VK1PK -
Homemade receiver for 80 meters band. The receiver works very well (in fact better than some of its successors), especially the AGC makes listening to 80m QSOs a real pleasure. Sensitivity is not cutting-edge, but on a full-size short-wave antenna it is by fare sensitive enough. -
Using a PC with soundcard as a VLF receiver, how to use your PC as a receiver for narrow-band signals in the VLF radio spectrum by DL4YHF -
An explanation of the different procedures and definitions that are commonly used for blocking dynamic range (BDR) measurements. Dynamic range in general is the ratio between the weakest signal a system can handle and the strongest signal the same system can handle simultaneously without an operator switching attenuators or turning volume potentiometers -
This project details the development of a modular direct conversion (DC) receiver designed for experimental flexibility in amateur radio and HF signal listening. The mainframe integrates a diplexer, DBM, and AF amplifier, supporting interchangeable local oscillator and antenna filtering setups. A tunable passive HF preselector complements QRP Labs bandpass filters for enhanced signal reception. Utilizing a NanoVNA for precise tuning, the receiver achieves improved signal-to-noise ratios across amateur and non-amateur bands, making it a versatile platform for further RF experimentation. -
This is a compact three transistor regenerative general coverage receiver with fixed feedback. The sensitivity and selectivity is relative good, especially on the LF and MW bands, as can be expected with this simple design. -
Recepteur decametrique 3 - 30 MHz Detection classique et SDR -
One-Cubic-Inch Direct-Conversion Receiver -
The MiniTioune receiver project, developed by Jean-Pierre F6DZP, consists of the home constructed MiniTiouner hardware which interfaces via a standard USB 2.0 port to a Windows PC running the MiniTioune software. It can be used to receive satellite broadcasts transmissions making it ideal for use on Q-oscar 100 Es hail-2 without any external frequency converters. -
Direct conversion receivers (DCR) are gaining renewed interest due to advancements in semiconductor technologies and their suitability for integration in compact, low-cost, multi-standard applications. Unlike traditional superheterodyne receivers, DCR eliminates image frequencies and bulky off-chip filters but introduces challenges like DC offsets, nonlinearity, and noise issues. This tutorial explores DCR's historical development, compares it with other receiver architectures, and addresses its inherent obstacles. DCR's potential for integration and compatibility with software-defined radio highlights its role in modern communication systems despite its technical complexities. -
How to modify your scanner or receiver with a discriminator output. If you want to decode and monitor digital (FSK and PSK) systems seriously, a discriminator tap is an absolute prerequisite. -
The build was an experiment to see if a tube receiver could be stable enough to receive digital shortwave radio broadcasts. The tube acts as both an oscillator and mixer, so the receiver is a type of direct conversion receiver. -
A simple superheterodyne receiver (3.5–30 MHz) for amateur radio achieves stable SSB-CW reception using modern BJTs, an AD831 mixer, a 6-pole quartz filter, and Seiler oscillators. Designed with high IF (4.5 MHz), compact AM-FM variable capacitors, and modular resonant circuits, it ensures selectivity, image rejection, and stable tuning. Built in a copper-lined wooden case, it features practical assembly techniques but lacks advanced features like AGC or S-meter. Effective on basic antennas, it achieves global reception. -
80 metre superhet SSB receiver project -
This article About Noise offers a clear, non-mathematical explanation of noise in telecommunications, making it accessible to radio amateurs. It categorizes noise into fundamental and intermodulation types, detailing sources like thermal, shot, and cosmic noise. The article effectively highlights noise impact on receivers and introduces key metrics like Noise Figure and Signal-to-Noise Ratio (SNR). While comprehensive, it remains digestible, balancing technical depth with simplicity. A great resource for understanding radio noise fundamentals without complex equations, though a more detailed discussion on mitigation techniques would further enhance its value.
