DDS-50MHz QRP Transceiver
  IMAGE11.GIF - 980BYTES 　Project Overview
  IMAGE11.GIF - 980BYTES    Hardware
  IMAGE11.GIF - 980BYTES 　Software
  IMAGE11.GIF - 980BYTES 　Software Down Load
  IMAGE11.GIF - 980BYTES 　Reference
IMAGE12.GIF - 2,801BYTES

Updated on
May 12, 2003 



STRX0.JPG  STRX1.JPG  STRX2.JPG  STRX3.JPG - 8,854BYTES

STRX4.JPG - 5,319BYTES  STRX5.JPG - 8,090BYTES    STRX6.JPG - 6,375BYTES

STRX7.JPG - 7,643BYTES  STRX8.JPG - 7,395BYTES
 



50MHz QRP Transceiver / OverviewIMAGE12.GIF - 2,801BYTES
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DDS ---- Basic information
Please see here

Transceiver ---- Basic concept
Merit of using DDS is flexibility of design of local oscillators. We can decide a frequency of RX local OSC with any restrictions.
Demerit of DDS is controlled by CPU. So I decided to add some function achieving by CPU. 1st is MORSE CODE DISPLAY using LED and 2nd is transition control between TX and RX.
DDS module
TRX specification




50MHz QRP Transceiver / HardwareIMAGE12.GIF - 2,801BYTES
TOP02_001.PNG - 934BYTES

Circuit Diagrams

---- Main part (6 pages)
---- PIC part

Panel Layout
LTRX0.JPG




50MHz QRP Transceiver / SoftwareIMAGE12.GIF - 2,801BYTES
TOP02_001.PNG - 934BYTES

PIC control program

---- State transition
---- Frequency tuning




50MHz QRP Transceiver / Software Down Load
IMAGE12.GIF - 2,801BYTES
TOP02_001.PNG - 934BYTES

Control program for PIC
-------    50MHzTRX.EXE(86kB)




50MHz QRP Transceiver / Reference
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TOP02_001.PNG - 934BYTES

Related web site

DDS chip
Here

Others
--- LA1600
--- NE602
--- LM386
--- PIC16F84