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 Amateur Radio Frequency Measurements:




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AAZ-0612 (Obsolete) Kits no longer available

Active Project: AAZ-0217 (Full Kits and Assembled) 


Measuring antenna impedance or line losses is of a great interest to Radio Amateurs. That too when it comes to measure an antenna performance without having a transmitter, it brings special attention of homebrewers.

This project uses AD9850/51 as a Signal Generator and AD8307 as a detector and works with a resistive return-loss bridge.

Look simple but it is made so by our friend Tony / I2TZK who spent a lots of time in making Firmware and PC software for this project. 

Antenna Analyzer: AAZ-0612 is designed on a double sided PTH board measuring 11x6.5CM and its a full USB device. 

A special PC software is developed by Tony / I2TZK which, when installed on your PC, gives you a graphical presentation of how good your antenna is!!

To further cheer-up homebrewers, we have made a small carrier board for SSOP28 package of AD9850/51. AAZ-0912 kits are supplied with DDS chip pre-soldered on carrier board to make assembly of this kit without much pain.

Purpose of this project is to encourage radio amateurs to build their own Antenna Analyzer at a low cost.  

I2TZK PC Software (WinXP/WIN7) & PIC Firmware V3.00 for AAZ-0612 has achieved following design task:  

Simple Single Micro Controller with built-in A/D converter (PIC18F2550/2553)
DDS Based signal Generator. Act as a signal source too
Main features are:
USB Powered.
Full HF Range: to 35MHZ
Stable Reference voltage using MCP1525.
BNC Connector for antenna connection
Calculates SWR and other parameters of antenna 
Free PC Program by Tony / I2TZK 
Firmware accepts PIC18F2550 or 2553 and DDS AD9851 or AD9850 (V3.00).
AD8307 as a Log Amplifier.
AD9850/51 Carrier board supplied
PC USB Noise
Important Note:
PC Noise do have influence over performance of AAZ kits. If erratic DDS operation or readings are observed, please use a Split Toroid over your USB Cable. (Or use USB cable with an EMI Toroid)
 AAZ - 0612: Partial Kits

Click the image to enlarge

 Antenna Analyzer Schematics, Tech Details & Parts List:


AAZ-0612 Specific Documents
Antenna Analyzer Tech Info Doc. AAZ-0612 0-500MHZ RF Sensor Document
Antenna Analyzer AAZ-0612 Partial Kits Parts List 0-500MHZ RF Sensor Document
AAZ-0612 Full Kit ADD-ON 0-500MHZ RF Sensor Document
Antenna Analyzer Schematic Partial Kits AAZ-0612


 Documents / Files for AAZ-0612 


V3.00 FW Specific Doc

AAZ User Guide V3.00 0-500MHZ RF Sensor Document
What is new V3.00 0-500MHZ RF Sensor Document


Project Introduction by I2TZK 0-500MHZ RF Sensor Document
Antenna Analyzer PC Software User Guide

0-500MHZ RF Sensor Document

Antenna Analyzer Performance information

0-500MHZ RF Sensor Document


 AAZ-0612/0912 PC Software, Firmware and Documents
I2TZK Web Site

I2TZK Download Page

FW/SW V3.00

V3.00 Supplied with AAZ-0612 Kits and AAZ-0912 Full Kits

Last FW & SW Files

FW V2.02, PIC18F2550/2553 

PC SW V2.02, PIC18F2550/2553 


AAZ-0612 Kits no longer available.

Please consider newer version AAZ-0217

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