1/07/2021 - Added Option in Menu - 19db Preamp Board add on

30/05/2021 Added Enclosure on Thingiverse.

1/06/2021 New batch of Boards! - Added options: Assembled, Kit, PCB only.

The DSP Radio is based around the Silicon Labs chip SI4735. It is a full band radio in one chip and supports AM/MW/LW, FM Band 60 - 84MHz, and FM Band 84 - 108MHz including HF by using a patch to do SSB with USB/LSB, mostly used by Ham radio operators.

Added H.F Pre-amp for the Shortwave band

This 17db gain preamp board can be piggybacked onto the mainboard. It is available as an option.

I was fascinated with the idea when I saw the datasheet of this chip. Furthermore looking at the project I decided to build one. Information is scattered and incomplete. Information is hard to find or not available. So I ended up designing my own board and added features that are nice to have. Thanks to all the people who contributed to the Arduino library I was able to build my own version.

The Main Features are:

The DSP radio featured in this listing covers all Shortwave HF amateur bands from 1.9 MHz to 28 MHz. Also covers the FM band from 64 - 108Mhz, Reads and decodes the FM RDS signal, and displays it on the LCD screen and also the MW and LW bands.

Features

Uses the popular 0.96" OLED display to display all the information. (Colour is Random Blue or White)

Worldwide FM band support (64–108 MHz)

Worldwide AM band support (520–1710 kHz)

SW band support (Si4734/35 and Si4730-D60) (2.3–30 MHz)

LW band support (Si4734/35 and Si4730-D60) (150–510 kHz)

Excellent real-world performance

Automatic frequency control (AFC)

Automatic gain control (AGC)

Digital FM stereo decoder

Advanced Audio Processing

Seven selectable AM channel filters

AM/FM/SW/LW digital tuning

Stereo and Signal Indication

Fully customizable firmware thanks to the Arduino IDE. A big Appreciation goes to Ricardo for writing the library.

Uses an ATMega328P with the bootloader - upload a new firmware with serial port adapter

Accepts 2S BMS battery pack 8.4V - with rear charging socket - Always power this DSP radio with two 18650 batteries.

8 tactile switches - to control the radio functions Volume +/-,Band +/-, Mode SSB/LSB/USB,Step,Bandwith , Bfo/Vfo

Bandwith change control range 500 Hz to 4 kHz - ideal for noise rejection

Step tuning in four ranges 1,5,10,25

Rear BNC Connector for External Antenna with selectable band

Rear connector 3.5MM for Headphones

Auto Mute Audio clip when powered on (Remove Big Thump from the speaker)

Battery Status Voltage on boot up screen* feature in the firmware

1 Watt lm386 Audio Amp

Rear Latching Power Switch

Front PCB with OLED display and control buttons and Rotary Encoder measuring 37 x 100

What is Included?

Option 1: A Ready Assembled board, excluding battery and speaker

Option 2: Kit with all parts, excluding battery and speaker

Option 3: Printed circuit boards only. no parts