Currently 10kHz to 15Mhz receiver (with proper BPF) using AD9835 as frequency source, controlled by ATmega644PA (with bootloader). It supports firmware upgrades and filter width (CW/SSB) button selection. IR remote is supported by hardware, software is pending. TX part is under development as will be ICOM CI-V compatible interface.
Switch branches/tags
Nothing to show
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Permalink
Type Name Latest commit message Commit time
Failed to load latest commit information.
bootloader
firmware
sch
.gitignore
README

README

Direct Conversion TRX 
=====================

Author: Martin Sivak <mars@montik.net>
Based on the following projects and books:
  http://www.qrp.pops.net/popDC.asp
  http://hem.passagen.se/communication/dds.html
  EMRFD (http://w7zoi.net)

Schematics is in directory sch/
Firmware in directory firmware/
Bootloader in directory bootloader/

Goals
=====

- full TRX for HF bands (mainly 40m and 20m)
- DDS controlled
- RX: direct conversion with switchable attenuator and CW/SSB filter
- TX: CW QRP level output (5W)
- portable operation
- external BPF
- PC interface (probably Icom based to make it compatible with existing tools)
- IR remote control to supplement integrated buttons

Hardware
========

AD9835 DDS (mclk 50Mhz, 14Mhz LPF)
ATmega 644PA (int. osc. 8Mhz)
standard LCD 16x2, 4bit mode
IR demodulator SFH5110-38
rotary encoder
4 buttons