This is a tracking generator project using an Arduino computer and an AD9851 Direct Digital Synthesizor Module.  The tracking generator is designed to be used with an HP8568B Spectrum Analyzer. You can view the Hardware Diagrams  below:

You can view the Arduino C++ code by clicking on the link below:
 Arduino Code

The pictures below show the hardware:

Arduino Shield (Top View)
 
 
 

Arduino Shield (Bottom View)
 
 

Switches and Optoencoder
 
 

55 MHz Lowpass Filter and 6-dB attenuator
 
 
 

Inside view of the Enclosure
 
 
 

Another inside view of the enclosure
 
 
 

Front View
 
 
 

Rear View
 
 
 

Tracking Generator and HP8568B Spectrum Analyzer operating in the Wide Bandwidth mode with a lowpass filter
 
 
 

Tracking Generator and HP8568B Spectrum Analyzer operating in the Narrow Bandwidth mode with a crystal filter

The Arduino Source Code can be viewed HERE.