This is idea from LZ1CLK (My friend Dobri Melin). This is Direct Conversion QRP CW transceiver at any band between 1,8 and 10 MHz for less than $20.
First test video:
I had built new DDS with AD9833, Arduino, aluminum enclosure 100x60x40 mm, band change, step change for CW QRP transceiver Forty-9er 40m. It had finished and worked well.
Transceiver stage is made from Forty-9er eBay kit.
http://www.ebay.com/itm/Forty-9er-Kit-7-023MHz-Short-Wave-Ham-Radio-Telegraph-Transceiver-3W-CW-DIY/172808525224?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2055119.m1438.l2649
Arduino controller for DDS:
http://www.ebay.com/itm/MINI-MICRO-USB-Nano-V3-0-ATmega328P-CH340G-5V-16M-Micro-controller-board-Arduino/291906862007?ssPageName=STRK%3AMEBIDX%3AIT&var=590902858820&_trksid=p2057872.m2749.l2649
Arduino original example source code is from:
https://github.com/Billwilliams1952/AD9833-Library-Arduino
http://www.vwlowen.co.uk/arduino/AD9833-waveform-generator/AD9833-waveform-generator.htm
Hi, This project is realized idea from LZ1VF (My friend Valeri) . I want to make something equal - Chinese pre-build RTL SDR HF receiver (for $26.88) with new/different transmitter section based on my before projects - especially last transmitter stage from Forty2 (French QRP project). I will add modified arduino sketch - The Peppermint Bark BITX40 VFO , from KC1FSZ (also will add Si570 support - I'm still have unused one, and other staff). This sketch have Yaesu FT-817 emulation to connect arduino with many HAM software like N1MM+ , fldigi and other.
Receiver will be this RTL SDR:
100KHz-1.7GHz full band UV HF RTL-SDR USB Tuner Receiver/ R820T2+8232 Ham Radio
Transmitter:
RF amplifiers with LPF for 20m (14 MHz - this is my target band for day activity):
Arduino control (like PA0RWE schema without buttons - I don't need if control freq from notebook). This will be simple QRP transceiver, for mobile work, from My car:
TXOscillator is ready. Now Arduino is connected with software. This example picture is with fldigi, but I'm tested also with N1MM+
The source code/sketch is ready in My github based on Bruce MacKinnon KC1FSZ , The Peppermint Bark BITX40 VFO.
Main arduino code (sketch) of this project is developed by Richard Visokey AD7C - www.ad7c.com. Second revision is developed by VK8BN , to adding AD9851 support.
My revisions are:
Revision 3.0 - April, 2016 - AD9851 + ARDUINO PRO NANO + integrate cw decoder (uncontinued version).
Revision 4.0 - May 31, 2016 - deintegrate cw decoder and adding button for band change.
Revision 5.0 - July 20, 2016 - change LCD with OLED display and adding IF frequency support - now ready to control transceiver RFT SEG-100
Revision 6.0 - August 16, 2016 - software terminal support to control rig from computer with USB/serial interface. (Control buttons: 1 - up freq, 2 - down freq, 3 - step increment change, 4 - print state, also add no_display support in DDS generator, for any computer terminal software.)
The scheme realized with OLED display and needs source code from file: ad9851oled.ino program sketch. SOFTWARE REQUIREMENTS:
You need to install next libraries:
AdafruitGFXLibrary AdafruitSSD1306 Rotary
HARDWAREREQUIREMENTS:
You should alsoto use a program to find the hardware address (hardware break) of the display. Usually it is on 0x3C and the program was written for this address, but they are will be other if You have/use other devices with arduino board. If the display don't show anything - this will be one reason. In zip file are special software - i2c_scanner.ino, who can detects the hardware addresses of I2C devices - use it.
With OLED Display support:
4 pins are used: +5V - directly from Arduino GND - again from Arduino A4 - Analog I/O from Arduino to SDA pin on oled display A5 - Analog I/O from Arduino to SCL pin on oled display.
IF frequency is experimental measured from LSB signal of transceiver on 7 MHz. In CW working actual frequency is shifted by about 1 kHz.(On CW, what's on the screen is less 1KHts with the actual frequency - if You are in 7005 on the screen, You are actually on 7006 kHz). In this version IF is set hardly, but can be done to change according to the type and scope of work (least according to the scope LSB / USB), which to me now not need. In above of 12 MHz My RFT trx is not tunning, whether for, or because from hardware limitations in LPF or BPF - it's not clear merged, but I'm not think/time to brighten now.
TRANSCEIVER SIDE: You need to open RFT SEG-100 and unscrewed the top cover is evidence SMC connector (the pictures shown where) and fed directly the signal from DDS to the cable connector.
ARDUINO + AD9851 + DISPLAY
This schema (with LCD) is developed byAD7C and VK8BN:
CONNECTION OF DDS WITH TRANSCEIVER:
Output from DDS to input of transceiver is realized with this schema:
ALL DATA FILES, PICTURES, LIBRARIES AND SOURCES YOU CAN DOWNLOAD HERE:
