HF-SSB-CW-direct-conversion-receiver - 源码 - 源码 - 免费下载

HF-SSB-CW-direct-conversion-receiver

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资源说明：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.

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

Author: Martin Sivak 
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

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