Once you have control of the vfo and bfo in software, controlling. Either of these can be obtained from many sources such as. Click on any section of the diagram for more information on that part of the vfo. Feb 02, 2017 january 2017, summer holiday season downunder, afforded time to build something ive been wanting to build for several years, my first digital vfo. My second homebrew arduinosi5351 digital vfocontroller. It can be remote controlled via the serial port to set and get the frequency and the. Direct digital synthesis dds with bil herd duration. Everything else is as per raduino other than the presence of a second. The analog devices ad9851 is used in many ham radio projects, also widely used is the silicon labs si5351. A digital vfo for vintage transmitters main page and. The main category is ham radio arduino projects that is about arduino projects.
Back in february 2017 i scratchbuilt my first arduino and si5351 vfo. The resource is currently listed in in a single category. Ad9850 dds with hitachi compatable lcd 16x2 and a rotary encoder arduino forum using. Aug 09, 2017 back in february 2017 i scratchbuilt my first arduino and si5351 vfo. Arduino based external vfo for yaesu ft301 with ad9850 or ad9833 dds with lcd or led display. Videos you watch may be added to the tvs watch history and influence tv recommendations. I posted the code, put up some horrible schematics, and let it sit. Richard visokey, ad7c, has a nice design for a 1 mhz to 40 mhz vfo that uses the ad9850 dds. This vfo will also be handy for the bitx easy when its released, as theyll be selling a version with and without a vfo bfo included parts list.
It is a vfo that can be used just as an ordinary transistorfet vfo would be. Well, the bitx40 project had led me to wanting to investigate the dds vfo concept a little deeper think signal generator andor standalone vfo. The how to of connecting an arduino board to an si5351 board, wiring up a display, and loading the. The arduino version is partly based on the original multifeaturedvfo software of jason. The connections for lcd, si5351 and avr are explained in may previous post at a simple si5351 based vfo signal generator for ham radio use quick startsetting up and general details. If you are an experienced arduino programmer and radio operator, you may not need to read all the details and may use this information as a general guide to get up and running quickly. Softwaredefined radio sdr is a radio communication system where components that have been traditionally implemented in hardware e. This module is well documented and easy to connect to the arduino. Ad9850 dds with hitachi compatable lcd 16x2 and a rotary. A 50mhz crystal oscillator module supplies the master clock and gives usable output frequencies up to a quarter of that value or 12.
The ad9850 signal generator module will produce the sine wave for the vfo. Software defined radio sdr is a radio communication system where components that have been traditionally implemented in hardware e. A simple single freq ad9850 arduino test script original ad9851 dds sketch by andrew smallbone at. The si5351 is on an adafruit breakout which includes a 3. Saving an arduino controlled dds vfo frequency over a power cycle vk3hn says. Hi rick, i built your project dds vfo driven by arduino following also software indications and i must say it works very well, congratulations. Tom hall here to a arduino nano and built the vfo as per this design. The changes are the inputs used for the encoder and. The code is 100% dropin compatible with the old code and no rewire is required. Arduino si5351a vfo ok, by popular demand, here are my project files for the arduino si5351a vfo. Nano dds vfo firmware installation instructions for. Ad9850 dds with hitachi compatable lcd 16x2 and a rotary encoder.
To many, this will be just another si5351 vfo project, with nothing to distinguish it from the others. By using an arduino uno r3 and an ad 9850 or ad9851 dds module a very stable vfo can be created to add a vfo to any crystal locked radio or to replace the vfo in an older vfo controlled radio that suffers from drift or add an external vfo. A basic arduino nano based portable device, having portable power, a basic display and circuitry to measure voltage, current, pulses, test components resistors, capacitors, transistors. Lex ph2lb has used the arduino shield as a playground to develop a external vfo for my old ft301 so he can work split. May 11, 2015 note regarding software assembly instructions kit photographs example sketches ft301 external vfo by lex ph2lb multiband wspr rxtx by gwyn g3zil. Here are the parts used to make the arduino vfo bfo, all available on amazon or at qrplabs. This has been kept as simple as, any bufffering, amplification or filtering is left up to you to build to suit your purposes. The ad9850 is a highly integrated device that uses advanced dds technology coupled with an internal high speed, high performance, da converter and comparator, to form a complete digitally programmable frequency synthesizer and clock generator function.
All that you need is an arduino, a rotary encoder, a 16 character x 2 line i2c lcd display, and some software. The stability, precision, and software flexibility of dds vfos make these devices an attractive option to keep vintage gear on the air. I am using bitx 40 transceiver board and here the if is 12mhz. Now what i want to understand is how to lower below 1 mhz as originally, at least do it from 500 khz because it would do a vfo to drive a transmitter for medium wave range. I wanted to further save some cost and build it using a bare atmega328p chip, where pravin had been a great help. The result was a very simple and stable vfo that just about anyone could build. The entire unit can be 5 volt powered either from the teensy usb jack or from the battery charger, i added a fat diode to isolate the two sources. Nano dds vfo is a modification of the original vfo design in. Inexpensive to build but a very useful tool for every electronics laboratory. An precession signal generator is very easy and affordable make using an arduino and dds synthesizer ad9850. I put together this breadboard version of an ad7c designed dds vfo demo with a little help from pen friend ab9xc pravin kumar anandan. Nano dds vfo is a modification of the original vfo design in arduino projects for amateur radio by dr.
Signal generator vfo with direct digital synthesis version 3a by bruce aa0ed and craig aa0zz. Vfo driver amp article published in cq, june 2011 new pc board for control switches and encoder. About dds vfo using arduino the resource is currently listed in in a single category. Arduino frequency synthesiser using 160mhz si5351 instructables. Due to the popularity of the arduino, i rewrite the pic software for using an arduinonano. It has a much higher programming level than the open source version. The software allows for the frequency to be adjusted in steps from 1 hz, 10 hz. This link is listed in our web site directory since wednesday dec 18 20, and till today dds vfo using arduino has been followed for a total of 3283 times. Nano dds vfo is a modification of the original vfo design. Modified for testing the inexpensive ad9850 ebay dds modules. The displayed frequency is arithmetically corrected when the vfolo configuration is used. Its uses a ad9850 because he needs a almost clean sinewave output. With the wide range of arduino breakouts, all sorts of control and.
Storage, safety, switches, sensors, software, and sites. The dds vfo 2 is designed as a companion vfo for the mst3 transceiver, although it may be used with many other rigs. External vfo should send no signal when internal vfo is used see pin 3. This is a full kit containing all onboard parts including blue backlit lcd and the dds chip comes preinstalled on the pcb. The changes needed to the exiting sketches for the modular rig to replace the ad9850 with si5351a are actually quite small. A dds vfo demo using ad9850 dds chip controlled by a bare atmega328p ic. Quickly test an ad9850 ebay module with an arduino an d a soft ware defined radio sdr quick start for. Its worlds first smallest portable signal generator build. Saving an arduinocontrolled dds vfo frequency over a power cycle vk3hn says. More than two years ago i posted a project to this site detailing how i took a little dds unit i found i ebay and controlled it with an arduino uno and lcd. Arduino vfo nco using an ad9951 dds, shield and library i have heard a lot of great things about dds chips and my research on them shows that, over the recent years, these chips have become more advanced to the point where they can work well as a low noise, good spuriousfree dynamic range sfdr, variable frequency oscillator vfo aka numerically controlled oscillator, nco. If playback doesnt begin shortly, try restarting your device. Since the atmega328p supplied with the qrp labs si5351a vfo signal generator kit is a socketed dipstyle ic not surface mount it could be easily replaced with an equivalent chip that has the arduino bootloader installed.
May 24, 2014 arduino vfonco using an ad9951 dds, shield and library i have heard a lot of great things about dds chips and my research on them shows that, over the recent years, these chips have become more advanced to the point where they can work well as a low noise, good spuriousfree dynamic range sfdr, variable frequency oscillator vfo aka. Diy sensitive software defined radio with ad9850 vfo arduino. I decided to use the ad9854 dds module for the basis of my vfo for the radio, i purchased a chinese ad9854 dds evaluation board which unfortunately did not come with any documentation or example code. Ad9850 module dds signal generator v2 electrodragon. It is a generic nanosi5351 module wired up to farhans raduino circuit. I have updated the code to my arduino dds vfo sketch so the current set frequency is stored in eeprom and recalled again upon bootup. Chapter 22 mpide software 227 mb file libraries used in the projects. I am working on making a breakout board for si5351 multiple clock generator chip and a vfo for ham rigs which can provide vfo, bfo and cw tone from 1 circuit. The displayed frequency is arithmetically corrected when the vfo lo configuration is used. Youve arrived at the support page for arrls more arduino projects for ham radio by glen. Arduino vfonco using an ad9951 dds, shield and library.
The frequency writes to the eeprom after 3 seconds without changing. Jan 04, 2018 the components are, top to bottom, blue 16. Its work in progress but info, pictures, videos and the sketch are available at. Should only cw and usb be required, then leave the lsb line unconnected, as to use the arduino dds bfo, to select say usb, then the triband digital vfo software will pull to gnd on the appropriate led pin to switch on the led, and in addition will also activate the usb on the dds. Now direct digital synthesizer hardware is available on a single programmable chip. An arduino based dds 60 controller a recent project has been the building of a digital vfo based around the dds 60 kit and arduino controller. Designed with a frequency setting range of 20khz to hopefully 75mhz, but spectral performance may be poor.
I have paired may ad9850 with an arduino uno, lcd display, rotary encoder. This design also works with a arduino uno, nano, mini or other similar platforms. The software has the same functionality as the pic version. Device description for a long time i wanted a general purpose signal generator. Arduino code adafruit si5351 clock generator breakout. By using an arduino uno r3 and an ad 9850 or ad9851 dds. Two different rotary files were present in the project rotary and rotary master. The vfo now supports an intermediate frequency and can switch upon the hilow level of one analog input on the arduino.
Recently the clock generator chip si5351a from silab is gaining popularity due to its lower cost and ability to generate multiple clock signals for e. I ordered the parts for this on ebay from nyplatform, received them within five days and built it in an evening. They have fixed a number of bugs and have modified many of the subroutines to make them more efficient and easier to understand. Nov 05, 2016 a simple si5351 based vfo signal generator for ham radio use quick startsetting up and general details a simple and stable vfo is an integral part for radio experiments. Quickly test an ad9850 ebay module with an arduino. You may want the guide for installing the arduino ide windows.
To connect the vfo and keying amplifier to a vintage transmitter, you must make the following connections. The arduino version is partly based on the original multifeaturedvfo software of jason mildrum, nt7s and przemek sadowski, sq9nje. A simple and stable vfo is an integral part for radio experiments. After deleting the rotary master file from the project, the code compiled correctly.
A digital vfo using arduino teensy, 16x2 display, rotary encoder and the dds60 daughterboard. This kit is an arduino shield kit only additional items are shown in some of the photographs, to illustrate possible applications. Each band may be configured in a vfo only or vfolo combination. The full kit version includes all the parts to build the complete kit. The output of dds vfos tends to be relatively low because of the very low operating. Ad9850 dds with hitachi compatable lcd 16x2 and a rotary encoder read 32504 times previous. Yet another arduino nano and si5351 digital vfobfo vk3hn. Arduino dds vfo with ad9850 module arduino project hub. Contains the code for a arduino based external vfo for the yaesu ft301d with ad9850 or ad9833 dds to generate the frequency and a lcd or led display as user interface. Part 1 looks at the hardware and whats needed to be worked out prior to writing the software. Ad7c amateur radio blog, log, and outdoor adventures. The key, bug, or keyer center negative is connected via shielded cable to the keying input of the keying amplifier.
Sign up a digital vfo using arduino teensy, 16x2 display, rotary encoder and the dds 60 daughterboard. The board layout was done in sprintlayout and i do have some boards being fabbed up in china and should have them here within a week, as i need a few for my own projects. The if can be anything you wish and can be additive or subtractive. As you can see this vfo puts out a stable and healthy signal. January 2017, summer holiday season downunder, afforded time to build something ive been wanting to build for several years, my first digital vfo. In one of my earlier videos i described making cheap arduino dds vfo with ad9850. The arduino code of the full kit version no open source has countless functions and settings. Hi jan, i done this program in my arduino pro mini and it is working well.
Arduino and ad9850 dds synthesizer university of wisconsin. Inside the dds vfo, when i set the offset if as 7mhz2mhzfif. The arduino uno dds vfo hf signal generator project is designed as a test equipment project for home construction of test equipment used for ham radio. Never hunt around for another crystal again, with the si5351a clock generator breakout from adafruit. The output level from this synthesiser is approximately 3 volts peaktopeak. Each band may be configured in a vfo only or vfo lo combination. Two part video series looking at the software setup used to drive the si5351.
The si5351a clk1 output port is the vfo and clk2 is used as an lo. The main category is ham radio arduino projects that is about arduino projects for ham radio applications. An example of a simple project is a signal generator using an analog devices ad9850 dds synthesizer controlled by an arduino with a 2x16 display, encoder and 5way pushbutton. Ive built a kit digital vfo with presoldered surface mount parts and burnedin firmware, but this was to be a scratch build with arduino nano, c code with modifications, and a silicon labs. Diy sensitive software defined radio with ad9850 vfo. Its a useful thing to have either as part of a homebrew transmitter or transceiver or as a piece of test equipment. The si5351 breakout board is designed to run off 5 volts and has an i2c interface which makes it easy to connect to an arduino. Well, the bitx40 project had led me to wanting to investigate the dds vfo concept a little. Nano dds vfo firmware installation instructions for arduino ide. In theory, integer maths should be slightly faster and more accurate as the required frequency increases, in practice i find either method fast enough and accurate enough up to 30mhz, frequency errors are due to the poor stability of the reference oscillator on the dds module. The arduino uno can be substituted for the nano and meets the hardware i have, so seemed like a great place to start.
There are several solutions to generate an rf signal popular ones are. Note regarding software assembly instructions kit photographs example sketches ft301 external vfo by lex ph2lb multiband wspr rxtx by gwyn g3zil. Due to the popularity of the arduino, i rewrite the pic software for using an arduino nano. The internet is full of information and utube videos of using an arduino microcontroller to control an ad9850ad9851 dds circuit making some very neat vfo boxes.
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