Si5351 Vfo Schematic

VFO/BFO menggunakan SI5351+ Arduino Nano VFO/BFO ini menggunakan Arduino Nano sebagai Mikrokontrollernya, namun juga dapat digunakan juga type Arduino lainnya seperti Uno, Mega dll,dengan sedikit modifikasi. Страница 1 из 15 - Вариант синтезатора частоты на Si5351 (UR5FFR) - отправлено в Самодельные трансиверы: Доброго времени суток Начал публиковать инфу по своему синтезу на Si5351 При создании синтеза преследовались следующие. First investigations revolved around a. Searched online to find some schematics of step attenuators and then edited schematic into QUCS. QRP SSB Transceiver This project was started with some inspiration and ideas from N6QW and DK7IH who both have lots of similar projects on their web sites and Youtube. original schematic shows C21 and C2 values as 33pF but the actual kits contain 30 pF capacitors as shown in modification schematic. The DDS VFO is a complete AD9851 DDS Micro controller with software that can be used as a simple DDS signal generator, or as a VFO, ( variable frequency oscillator ) for a Radio project. wondering how to get to transverter mode. The Express Receiver is a homebrew, high performance HF amateur band receiver covering the 160, 80, 40, 30, 20, 17, 15, 12 and 10m bands. nl/2015/01/si5351-simple-vfo-hardware-setup. 1kHz with the "M6KWH IO92 20" message. It is impossible. CLK2 is planned to be used for the second mixer at 55 MHz, although there is some conjecture as to whether this will provide acceptable performance due to clock output crosstalk. Low Current Flexible si5351-based Digital VFO The new Silicon Labs si5351s oscillator chip and a Nokia 5110/3310 graphics LCD display lie at the heart of this versatile digital multi-output VFO for amateur radio applications. He even has the rotary encoder in there. Requires more mods, including one that drives the BFO from the si5351's clk. 6) Place and solder the OLED display on the board. net An Arduino Controlled GPS Corrected VFO A VFO that provides 1 to 112. Loads of functionality and nextion screens for it. To connect it to the KN-Q7A MC1350 chip and retain gain control is simply a matter of removing the 10k resistor between the IF gain pot and pin 5 of the MC1350 and connecting the pot side of the resulting gap in the circuit to the wiper pad on the mod circuit board (you don't fit the pot supplied in the kit as the IF gain control replaces it). I had some 25MHz smd crystals around and it turns out, that is all I really needed to get the si5351 working with a raspberry pi. Note the use of series 47ohm resistors on each of the buffered Si5351 ports in the schematic and visible above as R7, R8 and R9. Looking at the datasheets, the KSP10 looked to be a good match, so I picked up a few of those. Looking at the schematic of the board, it uses a SA612 as a crystal oscillator, and has a simple circuit to shift the frequency when going form transmit to receive. I picked up a few of the si5351 chips from digikey for less than $1 a piece. The VFO comes instead from the si5351 PLL chip on the Raduino through the Bitx40 connector labeled "DDS1" in the schematic. 3 V or 5 V controllers. Mounting a VFO capacitor properly is difficult. Here's my second one. For the PLL input, use either SI5351_PLL_A or SI5351_PLL_B; The final frequency is equal to the PLL / (div + n/d) div can range from 4 to 900; n can range from 0 to 1,048,575; d can range from 1 to 1,048,575. Now that I think I've fairly well determined that the Si5351 is suitable for use in a ham radio transceiver, it seems like time to put thought into action and actually try to build one. They looked simple enough, so I figured I could throw something together myself. First off, I took the C code from my Si5351 library for avr-gcc and converted it to an Arduino/C++ library, which you can find here. The first version in 2017 was retrofitted with a Si5351 and OLED Display. My basic goal was to build a project that could be duplicated easily with components that could be easily sourced through mail order. 15 at Mouser, but they are super tiny. Finally found that it was caused by light-emitting diode used as voltage variable capacitor for tuning. Improving direct conversion receiver design - … robkalmeijer. This si5351 Manhatten style constructed VFO is really slick. Hacking an earlier version of the Bitx40 to include the Si5351 LO and an OLED Display. Schematic Diagram:. This VFO was specialy build for use with the Multiband Bitx. As you can see from the waveform on the ‘scope screen, it’s not a perfect sine wave. A Simple Si5351 based vfo (signal generator) for ham radio use [quick start-setting up and general details] Hence it needs a level shifter and a 3. Manny thanks! I changed something into (instead of 16x2 lcd, put 20 x4), etc. It seems to work well. Hi, I am building a very simple DSB direct conversion handheld transceiver for 160-10m. It’s difficult because, without the stability of. Save Saved Removed 2. This website is Open Source, please help improve it by submitting a change on GitHub:. The program code is set in this listing as the lower ham band 160m, 80m, and the 40m band, with either CW or LSB. NT7S wrote the si5351 Arduino library that made it possible to use the Adafruit board as a VF. That’s less than a handheld GSM mobile phone (max wireless range ~35 km) or a flash light. The Arduino Pro Mini is a microcontroller board based on the ATmega328. W0EB Hardware and software mods for uBITX. It is based on ICs because I want it to be quick to build once one has the parts in hand. The VFO now supports an Intermediate Frequency and can switch upon the HI/LOW level of one analog input on the Arduino. This project is about a VFO and BFO that you can control two clock outputs of the Si5351A by using the Arduino Micro (Atmega32u4). Also note the rotary. connect the transmitter (Si5351, preamp, final, or lowpass filter) to the Arduino to use it as a Baudot Keyboard. Ready-selected sets of kits, making it easy for you to know what you need! Display: List / Grid. Sign in Sign up Instantly share code, notes, and snippets. The cool thing about the Si5351 is that it can generate both the VFO and the BFO frequencies for a receiver/transceiver at the same time. This si5351 Manhatten style constructed VFO is really slick. Although specifically conceived to fill a need in the Pic-a-Star rigs, this module can be used in other projects. The story leads to updated versions of the m0xpd VFO code for AD9850 and Si5351 systems. For easy use I added a electret microphone and mount it in the back of the enclosure. It was a homebrew hit, and many were built from schematics. Link to new sketch by SQ1GU:. 025mhz (close enough). The main modifications required to bring an older K2 up to date are described in Elecraft’s memo and in the older short list. INTRODUCTION A new product has recently been developed by Silicon Labs, the Si570 DSPLL® programmable frequency synthesizer, and it has great potential for use in many amateur radio applications. QRP SSB Transceiver This project was started with some inspiration and ideas from N6QW and DK7IH who both have lots of similar projects on their web sites and Youtube. The Express Receiver is a homebrew, high performance HF amateur band receiver covering the 160, 80, 40, 30, 20, 17, 15, 12 and 10m bands. If the rig needs a digital clock for other purposes, the 5351 can provide that as well. 8 to 30 MHz. From: allison To: [email protected]; Date: Thu, 02 Jun 2016 22:17:37 -0400; RE: HF1 Last year when I first saw HF1 I tried it proto style. It needs a little bit of work before I can transmit with it. Adafruit Si5351 breakout board using NT7S library as a VFO/BFO. The KTH-Si5351 board is using the Mouser Si5351 and a x-tal of 27 MHz, the Adafruit board is using a 25 MHz x-tal. Popular DDS choices include the AD9850 and the SI5351. Adafruit Si5351 Clock Generator Breakout Schematic and PCB Print. SOME SAMPLE OSCILLATOR CIRCUITS USING THE SA/NE602 MIXER. Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen. L5 and C103 of the BFO are missing, the BFO is at just about the right frequency if the crystals are matched without any adjustment. Just put up a video on YouTube of a superhet experiment using the mixer below. Test probes have easy access to all parts of the circuitry, unlike most “through-hole” equipment. The basic design comes from Farhan VU2ESE, with modifications by Ryan Flowers. Si5351 has up to 8 outputs (depending on version), covering all the common radio needs easily. The code for the Arduino is based on code from AK2B who based it on code from Jason Mildrum, NT7S and Przemek Sadowski, SQ9NJE. Added an Arduino controlled Si5351 VFO to the Bitx40. It is a generic Nano/si5351 module wired up to Farhan's Raduino circuit. set_freq(bfo_freq * 100ULL, SI5351_CLK0); Then I turned it on, saw that the BFO was now too far above the IF passband, and with a couple of experiments, came up with the following edit near the top of the sketch: #define INIT_BFO_FREQ (11997000L) unsigned long baseTune = 7100000L; unsigned long bfo_freq = INIT_BFO_FREQ;. The above circuit shows a switch, resistor, and capacitor connected in series. The Bitx40 board is a great base for experimenting with a 40m QRP SSB radio. I knew from reading posts on the Reflector, and seeing a local implementation, that I wanted to make changes to the Radio's Human Interface, all change seem to work very well. lafayette la224t schematic - Audio Players & Recorders question. However, you can digitally convert that crystal frequency into multiple frequencies over a range of about 8kHz to 160MHz. Si5351A/B/C-B 2 Rev. Hello Tom! I see you've implemented my request in Multi-Featured VFO code. nl/2015/01/si5351-simple-vfo-hardware-setup. Actually, the IC is designed so that 225 MHz is its maximum output, but the manufacturer limits it in the spec, as you can see. The post describing the VFO is here. Designed with a frequency setting range of 20KHz to hopefully 75MHz, but spectral performance may be poor. In case you are wondering about the custom built modules some of my Si5351 Modules have a Blue LED that is lit when power is applied. CLK2 is planned to be used for the second mixer at 55 MHz, although there is some conjecture as to whether this will provide acceptable performance due to clock output crosstalk. Full text of "An Arduino Controlled GPS Corrected VFO" See other formats Gene Marcus, W3PM/GM4YRE 1 1 3 Wickerberry Lane, Madison, AL 35756: [email protected] There are several solutions to generate an rf signal ( Popular ones are. Great work! I have yet to do this with an AD9850. So the board uses an Arduino Nano and the SI5351A breakout board from Hans Summers QRP-LABS. The sub VFO can be programmed to do many different things and if its set in the wrong mode you will either be stuck in transverter mode, or stuck on H. This website is Open Source, please help improve it by submitting a change on GitHub:. Variable Frequency Oscillators (VFOs) Sooner or later you'll become frustrated with being stuck on a few crystal-controlled frequencies. The cool thing about the Si5351 is that it can generate both the VFO and the BFO frequencies for a receiver/transceiver at the same time. A good opportunity for new comers, home brewers to built their own HF Transceiver and put their first foot step in HF Band, available both in DIY(Do it yourself) Kit and also full tested kit. A few exciting developments here on the Si5351 front. Hi All, I'm working on a ham radio project that uses the Si5351 clock chip. The sketch for the 240X320 TFT display uses this technique and the schematic for the Dual D Flip Flop is shown below. Just little things HI!! However, I do not know something, that's how with the frequency change LCD displays band. Signal output is square wave so there is lot of harmonics. Searched online to find some schematics of step attenuators and then edited schematic into QUCS. DDS VFO is very easy to make, easy to use ATMEGA8 IC on the market so it will not drain your pocket. Frequency allocations are made available specifically for ham radio and power levels allowed are typically much higher than available in unlicensed areas of the spectrum. Just put up a video on YouTube of a superhet experiment using the mixer below. Although specifically conceived to fill a need in the Pic-a-Star rigs, this module can be used in other projects. info newest frequent votes active unanswered. This sounds simple, but isn't. Chinese DDS boards were used on some of my earlier rigs but I noticed that they draw more current than the Si5351. Some Project Details: The first is the MMIC Transceiver which was the very first "big time" article I ever wrote about one of my projects --this even made the cover of QRP Quarterly. DDS VFO The S-Pixie can be modified to cover the whole 40 Meter band by replacing the oscillator with a VFO. The sub VFO can be programmed to do many different things and if its set in the wrong mode you will either be stuck in transverter mode, or stuck on H. 5MHz-4MHz receiver. Above — Power supply schematic. 3v regulator and crystal. - add a small ublox6-GPS-system with a special digital control algorithmn to correct the thermal and absolute deviation of the xtal in the si5351 breakout board: result: a universal GPS controlled generator with an absolute frequency precision of roughly about 10^-8 (=10 ppb) (You find them on the well known Chinese delivery pages for about 3 US$. So thanks my friend. This time with the popular Si5351 clock generator, allowing to create a complete solution for a superhet, including both the VFO and BFO oscillators. set_freq(bfo_freq * 100ULL, SI5351_CLK0); Then I turned it on, saw that the BFO was now too far above the IF passband, and with a couple of experiments, came up with the following edit near the top of the sketch: #define INIT_BFO_FREQ (11997000L) unsigned long baseTune = 7100000L; unsigned long bfo_freq = INIT_BFO_FREQ;. My basic goal was to build a project that could be duplicated easily with components that could be easily sourced through mail order. The new VFO was. Assembly Manual for VFO Board 20 June 2019 Parts list Note that the SI5351 SMD is already mounted. We don't expect any EAE (Earth Asteroid Earth) contacts at that distance and speed So I think we all might be safe from this near miss and can safely settle down and enjoy CQ­DATV 29. Showing 1-20 of 37411 topics [HTL] Episode 186 - Augmented Reality in Contesting Question about mystery part on vintage QRP. 5W Amplifier Schematic----- ERATTA: For the current level V1. Just put up a video on YouTube of a superhet experiment using the mixer below. This is a 0~55MHz (latest version, firmware updated in 2013) DDS Signal Generator. Sign in Sign up Instantly share code, notes, and snippets. The sketch for the 240X320 TFT display uses this technique and the schematic for the Dual D Flip Flop is shown below. Instead, I replaced the BFO entirely with a spare channel on the Si5351 frequency synthesizer. The AD9850 DDS VFO used can be also sourced from eBay, as. This has arrived in the form of the Silicon Lab SI5351 chip, a CMOS clock generator from 8 kHz to 160 MHz with I2C bus. Building the BITX 40 v 3 A SI5351 VFO update 1/22/17 Between getting ready for the Holidays and a couple things i need to do around the house, I have not been spending much time working on the BITX. The RF board measures 5. The Si5351 uses a crystal, so it is very stable. The Arduino Nano is between the Si5351 board and the display board. Interestingly, the first group buy of parts was arranged by none other than Hans Summers, who now runs QRP Labs. [N2HTT] likes to build radio projects and he decided to take an Si5351 clock generator and turn it into a three frequency VFO for his projects. 何時もお世話になっているkさんから、k4gc vfoスケッチについて相談を受けた。 エンコーダ操作で周波数調整が困難との事であった。 スケッチを見ると割込み処理を行わずに、エンコーダ読取りが行われており、取りこぼしが原因と思われる。. The “innards” look attractive. Dazu ein digitaler VFO samt Display und Arduino-Steuerung (auf einer kleinen Zusatzplatine, die auf die Hauptplatine aufgesteckt wird), sowie (fast) alle Bauteile, die man braucht, um das Gerät fertigzustellen. The Express Receiver is a homebrew, high performance HF amateur band receiver covering the 160, 80, 40, 30, 20, 17, 15, 12 and 10m bands. LightAPRS is the most affordable, smallest, lightest, powerful and one of few open source APRS trackers available. The Si5351A chip uses an external precision crystal to make a precision clock signal that uses it to drive multiple PLL's and clock dividers using I2C instructions. As far as the design of a decent signal generator goes, I've always wanted to do such a thing or help somebody with the design in a group effort. Si5351A Synth VFO What else is one to do on a lazy Sunday afternoon than to take a QRP Labs Si5351A Synth module and turn it into a VFO using an Arduino, LCD and Rotary encoder. So thanks my friend. DDS Module AD9851 AD9850 Development Board Signal Generator Frequency Synthesis Send Schematic Program 0. Both designed by Joris (KTH rf-Design). September 2018: Here’s a post on a compact G6LBQ BiTx using an Arduino/si5351 VFO and BFO. Both outputs have a range of approximately 3. In software, after the step switch has been released, the pin (A on the VFO schematic) is then made an output and after a short delay, a number of short pulses, according to the step size selected (1 for 10Hz, 2 for 1kHz and 3 for 10kHz), are sent to the 4017 to clock the outputs of the 4017 and light the appropriate LED. Encoder for tuning, 1HZ to 1MHZ Steps Configurable. But I am facing two problems. The sub VFO can be programmed to do many different things and if its set in the wrong mode you will either be stuck in transverter mode, or stuck on H. RE: Si5351 jako VFO do odbiornika VHF. 96 “with an Arduino. Sounds pretty useful as a replacement for a VFO in radio projects. com' open source project. Adafruit_Si5351_Library-1. The Si5351A VFO/Signal Generator kit has a rotary-encoder tuned output, and a separate independent fixed (configurable) output. Back in 2009, I did a blog post about my then new Si570 synthesizer board being controlled by my then new Arduino MCU board. Johnson Ranger transmitters: When I would put the VFO on spot and listen to the beat note on higher bands, the beat frequency changed significantly as I activated and tuned the power amplifier. Also note the rotary. However, this time I wanted to build a superhet receiver. Tagged Questions. I'm pretty sure I can get it going, but the command structure is quite complicated, and I was wondering if anybody had implemented it in PBP yet?. 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. Hey, I have replaced the VFO (6MHz to 6. Hardware is made by a AD8302 return loss /Phase detector with a DDS ad9850. An experiment using core memory, a microcoded FORTH machine built from discrete logic, a homebrew spectrum analyzer, and an experimental GPS receiver! Too cool. - The device is universal and compatible with most of modern transceivers. [SSDN] ZL1UEM'S Tiny OLED Si5351 Arduino VFO Showing 1-1 of 1 messages [SSDN] ZL1UEM'S Tiny OLED Si5351 Arduino VFO Schematic for the RTL SDR Dongle Front End. AD9850 DDS Signal Generator. Actually, the IC is designed so that 225 MHz is its maximum output, but the manufacturer limits it in the spec, as you can see. The code is Common Creative. Building a Homebrew Arduino Mega2560 AD9850 DDS VFO Building an Arduino Mega 2560 version of the AD9850 Module DDS VFO. Schematics 4 Free:. Buy NooElec AD9850 DDS Signal/Function Generator Module, Digital Tester: Computer Components - Amazon. All gists Back to GitHub. They must be taken a count if this generator is used for transmitter. Adafruit Industries, Unique & fun DIY electronics and kits : - Tools Gift Certificates Arduino Cables Sensors LEDs Books Breakout Boards Power EL Wire/Tape/Panel Components & Parts LCDs & Displays Wearables Prototyping Raspberry Pi Wireless Young Engineers 3D printing NeoPixels Kits & Projects Robotics & CNC Accessories Cosplay/Costuming Halloween Reseller and School Packs Internet of Things. Initial test results are promising, with SSB opposite sideband rejection >45 dB and input sensitivity near 0. Микроконтроллер Arduino Nano управляет синтезатором частот и преобразовывает данные в цифровой вид. 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. After the succsesfull reception tests I did with the Multiband Bitx on 20 Meters using the IK3OIL VFO,it was time to decide what kind of VFO I would use for my project. Ryuu's Receiver (Superhet using Si5351 and Color Display with IF at 10. Si5351 simple VFO hardware setup I see that there is a need for a simple Si5351 sketch to get hams started using this great little cheap chip. A lot of radios even today have a frequency output. This project is about a VFO and BFO that you can control two clock outputs of the Si5351A by using the Arduino Micro (Atmega32u4). Générateur HF (1 Hz à 40 MHz) et VFO DDS Arduino + AD9850 Lcd Keypad Shield Function Generator Arduino Lcd Arduino Projects Technology Ham Radio Electronics 3d Printing Cnc More information. Hans Summers G0UPL of QRP-LABS produces a range of really stunning high quality kits at very modest prices. The Display is a standard 16X2 and the VFO/BFO is generated by the Si5351 available from Adafruit Industries. You can see this heatsink on the upper part of the Adafruit Si5351 board, in the picture below. The new VFO was. The hard way, that's how. This blog is about amateur radio homebrew design experiments. Si5351 revision B specs dated 2015 declare that the chip can output maximum frequency of200 MHz instead of 160 MHz as they stated before. Interestingly, the first group buy of parts was arranged by none other than Hans Summers, who now runs QRP Labs. Si5351 VFO with I2C display: i2c_Si_VFO. Hello Tom! I see you've implemented my request in Multi-Featured VFO code. Mounting a VFO capacitor properly is difficult. Receiver The listen to the very clean, crisp and quite receiver. Assembled from a kit by an experienced builder and confirmed 5 watts output General Transceiver: Full-function CW VFO: Si5351 PLL Frequency Range: 14. Moving the encoder one way increases the frequency output in 10Hz steps but rotating the other way (anticlockwise) the output frequency decreases in 1Hz steps. Kitbuilders will do it for $10; Requires 9 to 15 volt DC supply, approx. Detailed information on the use of cookies on this website is provided in our Privacy Policy. Just plug out the Raduino and solder the supplied yellow VFO coil. My BITX 40 is operable "al fresco" on my workbench. Si5351 VFO with I2C display: i2c_Si_VFO. The filters are selected by 3 CMOS control lines. 60 thoughts on " AD9850 VFO II " Sajeev September 25, 2016. I started out by ensuring that the Arduino was talking to the synth over I2C, with that accomplished I was then able to calibrate the frequency by adjusting in code the actual frequency the crystal was resonating at. It is based on ICs because I want it to be quick to build once one has the parts in hand. This is a 0~55MHz (latest version, firmware updated in 2013) DDS Signal Generator. At the bottom left of the perfboard are the GPS connections. Great work! I have yet to do this with an AD9850. Full text of "Elektor SDR Reloaded" See other formats DESIGN Elektor SDR Reloaded SDR Shield for the Arduino By Burkhard Kainka (Germany) A Software Defined Radio is a universal tool in RF technology circles, one that can also be put to use for making measurements. UPDATE July 14th 2019:-the existing FT-7 VFO output level is about 120mV rms. For we use the VFO FET 2SK192 Type and reinforced with a single fruit type transistor 2SC1815. Welcome in the Radio World of Peter, DL2FI and Nikolai, DL7NIK Elecraft competence center and QRP hombrew since 2001 This is our information site, if you want to place an order, pleace goto www. It is capable to make frequency output from 1MHz to 150MHz with various step from 100Hz to 10MHz. Tagged Questions. Close this series with a metal box along with all Varconya. 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 spurious-free dynamic range [SFDR], variable frequency oscillator [VFO] [aka. 50mA, more if a backlit display is used. I would like a third party sheetmetal designer company come out with an elaborate attractive cabinet and knob complement “AKA Heathkit” styling. Ok, by popular demand, here are my project files for the Arduino SI5351A VFO. Hi all, New to the forum here and while not new to electronics I am new to the arduino series of products. Синтезатор на si5351 выдает сразу две частоты vfo и bfo. The natural choice was a PLL cleaning loop. Currently setup using the ubitx code firmware modified to the pin out of the Meg 2560. 8 Mhz to 5 Mhz to cover the 7. It uses a 4 line LCD for viewing and a rotary encoder with switch for band selection. The article has links to sketches, background and hardware links. Hans Summers G0UPL of QRP-LABS produces a range of really stunning high quality kits at very modest prices. project to share with those who have similar interests. In case you are wondering about the custom built modules some of my Si5351 Modules have a Blue LED that is lit when power is applied. +8 to 10dBm at the fundamental as measured on an SA. Export the board outline, holes, and rulers. 025mhz (close enough). A follow up video will demonstrate features & in-shack operation. TJ, there is a problem with the code for this project:-With the default freq_step set to 10Hz. The code is Common Creative. The Si5351 is a very small 3. It is based on AD9850 chip and is very easy to operate. Both designed by Joris (KTH rf-Design). Other than total cost savings in also using for a BFO is you can easily. T6-4 is tied to C142 and R144, U3-3 is tied only to the 12v rail labeled "TX", schematic does not show that clearly. project to share with those who have similar interests. First investigations revolved around a. zip: 2015-03-31: 14. So for the Airband kit I place the Si5351 (and the kit itself) inside the airband vfo box and changed the code from the DIP connections to the clock programming of the Si5351. Hacking the Bitx40 with a homebrew Si5351 with OLED Display. In the course of developing OpenBeacon 2, I determined that I would need to find a more suitable TCXO to use with the Si5351. 3 V IC, our board provides a low-dropout voltage regulator and level conversion circuitry so that it can be used with either 3. Schematic & Parts list: PIC18F25K22 and Si5351 1MHZ to 160MHZ VFO FD-SIGEN-0517 Si5351 VFO Parts List: * = Pre-soldered on PCB # = Assembled in tested for kits Note: No metal Case available. Si5351 and the Color TFT. Hi All, I'm working on a ham radio project that uses the Si5351 clock chip. An Arduino Uno DDS AF / RF signal generator: - by Alastair GW0AJU A signal generator designed for both audio and RF, an design improvement has been made by replacing the variable resistance pot for fine frequency adjustment, by a rotary encoder device, sourced and purchased from "eay". A follow up video will demonstrate features & in-shack operation. The 3rd output can be put to use as a CW tone generator. Full text of "An Arduino Controlled GPS Corrected VFO" See other formats Gene Marcus, W3PM/GM4YRE 1 1 3 Wickerberry Lane, Madison, AL 35756: [email protected] 3V SMD chip but Adafruit makes a good breakout board that is 5V tolerant and also contains a built in 25MHz reference oscillator. The diode mixers need an SWR of 1:1 at all the three ports (RF, IF and the oscillator drive). It is a generic Nano/si5351 module wired up to Farhan's Raduino circuit. (You must. Building the BITX 40 v 3 A SI5351 VFO update 1/22/17 Between getting ready for the Holidays and a couple things i need to do around the house, I have not been spending much time working on the BITX. Improper matching of the diode mixers can lead to a large number of spurious responses. It uses a 4 line LCD for viewing and a rotary encoder with switch for band selection. The Express Receiver is a homebrew, high performance HF amateur band receiver covering the 160, 80, 40, 30, 20, 17, 15, 12 and 10m bands. The Complete Si5350/51 Clock Generator Family Part Number I2C or Pin Frequency Reference Programmed? Outputs Datasheet Si5351A-B-GT I2C XTAL only Blank 3 Si5351-B Si5351A-B-GM I2C XTAL only Blank 8 Si5351-B Si5351B-B-GM I2C XTAL and/or Voltage Blank 8 Si5351-B Si5351C-B-GM I2C XTAL and/or CLKIN Blank 8 Si5351-B. It replicates the functionality in the avr-gcc library, but makes it quite a bit easier to rapidly implement. My basic goal was to build a project that could be duplicated easily with components that could be easily sourced through mail order. Reactance at 3. You can see this heatsink on the upper part of the Adafruit Si5351 board, in the picture below. The connection to the airband receiver kit mixer from the Si5351 is strait forward and worked first time:. 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. While not recommended for long term use it can even be hooked up 'al fresco" right on the bench and you are good to go. CLK1 is planned to be used as the main VFO from 45-73 MHz. My schematic is a little rough as I do not tend to create them that often so let me know if you catch anything out-of-place! Because of a lot of requests I have also created a version for IF (superhet) type receivers. The result is not encouraging. 5kHz to 290MHz. DDS VFO The S-Pixie can be modified to cover the whole 40 Meter band by replacing the oscillator with a VFO. 8 ohmios, 6 times 50 ohms. So the board uses an Arduino Nano and the SI5351A breakout board from Hans Summers QRP-LABS. This project is an evolution of the older AD9850 based VFO (here and here). The current draw on the supply is so small that it is not necessary to heat sink the 7812 regulator. Yup - It's Another Si5351 VFO A Scratch-Build of N6KR and Wilderness Radio's SST for 20M A Tuned Loop Antenna For The AM Broadcast Band The WBR - A Simple High Performance Regen Receiver for 40M by N1BYT N0WVA's One-FET Regen Optimized For SSB/CW Sounds Great!. Actually, the IC is designed so that 225 MHz is its maximum output, but the manufacturer limits it in the spec, as you can see. Supports IF+VFO, IF-VFO, and VFO-IF radios. It is based on AD9850 chip and is very easy to operate. Although specifically conceived to fill a need in the Pic-a-Star rigs, this module can be used in other projects. See also the similar project "VFO and BFO with Si5351 and OLED, controlled by Arduino (Micro)" Using this BFO to listening to 15 meters ham radio station on USB mode The first real test with this BFO project was made with a commercial radio that does not have SSB support. Simple code on Arduino can generate a LSB and USB signal with no hassle of pulling crystals down or up with inductors makes it so much easy and fun. It has three outputs that you can get three distinct frequencies at the same time. The rig as it comes is crystal controlled for FT8 but fear not the main board includes connections for an external VFO. The pad provides proper termination to the Si5351 and a proper drive to the diode mixers. While the Si5351A is a +3. DDS VFO The S-Pixie can be modified to cover the whole 40 Meter band by replacing the oscillator with a VFO. 1kHz with the "M6KWH IO92 20" message. Of interest to people constructing DC Receivers is the schematic in fig 3-d. Sign in Sign up Instantly share code, notes, and snippets. All gists Back to GitHub. 807 Am Transmitter Schematic 08-28-2014, 01:50 AM. VU3XVR Si5351 DDS VFO to Use BITX40. 4 Si5351 HAM HF Transceiver DDS VFO Synthesizer + KF33BD Discussion in ' Amateur Gear eBay Auctions Ending Soon ' started by Ebay , Dec 31, 2018. GitHub Gist: instantly share code, notes, and snippets. 3 V or 5 V controllers. There is a footprint on the board for C24. tiap minggunya akan di update tentang semua skema elektronik yang sudah pernah di buat. - add a small ublox6-GPS-system with a special digital control algorithmn to correct the thermal and absolute deviation of the xtal in the si5351 breakout board: result: a universal GPS controlled generator with an absolute frequency precision of roughly about 10^-8 (=10 ppb) (You find them on the well known Chinese delivery pages for about 3 US$. Optionally it can also be used with the OCXO/Si5351A synthesiser kit. We’ve (only) got 8k in the ATtiny85 so that’s why I’ve used a two line 16 character alphanumeric LCD. Same principle applies to the output side. The good thing is that the current consumption of this clock generator is very low. set_freq(bfo_freq * 100ULL, SI5351_CLK0); Then I turned it on, saw that the BFO was now too far above the IF passband, and with a couple of experiments, came up with the following edit near the top of the sketch: #define INIT_BFO_FREQ (11997000L) unsigned long baseTune = 7100000L; unsigned long bfo_freq = INIT_BFO_FREQ;. While the Si5351A is a +3. The 25 MHz crystal temperature drift was improved by attaching a small heatsink to the crystal case, near the Si5351. 3V regulator. 何時もお世話になっているkさんから、k4gc vfoスケッチについて相談を受けた。 エンコーダ操作で周波数調整が困難との事であった。 スケッチを見ると割込み処理を行わずに、エンコーダ読取りが行われており、取りこぼしが原因と思われる。. The frequency can be set from a connected computer via USB,. I started off by attaching wires to pins 8 and 9 of the Raduino board.