GenesisRadio G3020 30/20m Transceiver Introduction

General

Search GenesisRadio and WB5RVZ Sites

Use this search box to search for information available on the GenesisRadio.com and WB5RVZ.com websites related to this radio kit.

Theory of Operation

Click on the elements of the block diagram below to view the details of the various stages of the build. Each stage has an introductory section discussing details of the stage and/or its theory of operation.

G*** SDR - Block Diagram

Final Wiring Diagram

The final wiring diagram for the completed kit is in the (large) graphic found here.

Watch out for the pre-amp and attenuator switches in the Final Diagram. In the lower right hand corner there are they are labeled PREAMP and ATTN. According to the wiring of these two switches in the diagram, the names on the two switches have been reversed. The upper switch should be labeled ATTN and the lower switch should be labeled PREAMP.

(go directly to build notes) (go directly to build notes)

GenesisRadio G3020 30/20m Transceiver Bill of Materials

See Project Bill of Materials

Project Detailed Build Notes

For the non-expert builders among us, this site takes you through a stage-by-stage build of the kit. Each stage is self-contained and outlines the steps to build and test the stage. This ensures that you will have a much better chance of success once you reach the last step, since you will have successfully built and tested each preceding stage before moving on to the next stage.

Each stage is listed below, in build order, and you can link to it by clicking on its name below (or in the header and/or footer of each web page).

Background Info

Tools

Winding Inductors

To learn how to wind coils and transformers, please read the

Soldering

If you are not experienced at soldering (and even if you are somewhat experienced at soldering), refer to Tom N0SS's excellent tutorial on basic soldering techniques.


The video below describes techniques for soldering SOIC 14 (and 16 and 8) SMDs

"

View the above in full-screen mode on Youtube.

For the more adventurous, there is a process using solder paste and an electric oven called the reflow process, which can be used to install all the SMT chips to one side of the PC Board. This is documented by Guenael Jouchet in the following Youtube segment:

ESD Protection

You may wish to review the message topic beginning at Message 43554 for a common-sense discussion on ESD.

Work Area

Misc Tools

GenesisRadio G3020 30/20m Transceiver Testing

Each stage will have a "Testing" Section, outlining one or more tests that, when successfully completed, provide you with the confidence and assurance that you are heading in the right direction towards a fully tested and built transceiver.  

When you perform a test, you should always record the results of the test where indicated in the Testing section. This will make troubleshooting via the reflector much easier, since you will be communicating with the experts using a standard testing and measurement regime.

When comparing measurements to those published in these notes, the builder should be aware that actual and expected values could vary by as much as +/- 10%. The idea behind furnishing "expected/nominal" measurement values is to provide the builder with a good, "ballpark" number to determine whether or not the test has been successful. If the builder has concerns about his measurements, he should by all means pose those concerns as a query in the Softrock reflector so the experts can provide assistance.

It goes without saying that you should ALWAYS precede any tests with a very careful, minute inspection (using the best light and magnification available to you) to be sure all solder joints are clean and there are no solder bridges or cold joints.


This kit can be built and reliably tested using nothing more than a common multimeter. Tests assume that the builder has a decent digital multimeter of sufficiently high input impedance as to minimize circuit loading issues.  Measurements will be taken of current draws, test point voltages, and resistances.

Most stages will have a current draw test, in which the builder tests the stage's current draw in two different ways:

  • First, testing the draw through a current-limiting resistor
  • Then, when that test is OK, removing the current-limiting resistor and measuring the real current draw.
Some tests will require you to use your ham radio to receive or generate a signal of a specified frequency in order to test transmitters, oscillators, dividers, and/or receivers.
Optional testing. If the builder has (access to) a dual channel oscilloscope, along with an audio signal generator and an RF signal generator, and feels the need to perform tests beyond the basic DMM tests, certain stages will include in their testing section some optional tests involving this advanced equipment.


The IQGen or DQ-Gen programs available free from Michael Keller, DL6IAK, can be used in a pinch to get the sound card to produce audio tones for injection into the circuit.

You can always use Rocky to generate I and Q signals for tests requiring these audio signals (this is the author's preferred way)

Local Oscillator Dividers RX Mixers/OpAmps RF -In and Low-pass Filters/Att/PreAmp CW Monitor Circuit PC RX/TX Control Transmitter Driver and Power Amplifier