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 Amateur Radio RF Measurements:


 Dual Channel 500MHZ RF Meter: PM4


A Project by:

Tony / I2TZK, Frank / K7SFN , Dinesh / VU2FD


Dual Channel 500MHz RF Meter: Graphic CPU

Graphic CPU used in PM4 is a a core of our "INFINITY" Project and is developed keeping in mind that we use same CPU/LCD/Hardware for various Purposes or Projects, saving a lot of money in hardware. 

This is important for homebrewers because  RF measurement some times, is only a one time a  month (or a year!) requirement in a Radio Room!!

PM4 is designed to work as a standalone unit. A PC program may be available in future from Tony/I2TZK.

PM4 is a dual channel 500MHZ RF Meter, designed in two parts, interconnected by a D9 Male to Male Cable (usually supplied with Graphic LCD/CPU KIT):

1. Graphic CPU and

2. Sensor unit with 2 X AD8307 Log amplifiers

PM4 Graphic CPU-0613:

Graphic CPU: 128X64

Click above picture for larger view

PM4 Sensor Board with 2 X AD8307s:

500MHZ RF Sensor with 2xAD8307

Click above picture for larger view


PM4 RF Meter Hardware Details:

Graphic CPU with PIC18F4550
Graphic CPU hardware details:
128 x 64 Graphic LCD with Back light control  
DC12V or USB Powered 
Expansion slot for relays and alarms (FRC16)
8 DIP Switches for CPU Configuration


RF Measurement Sensor has Two AD8307s and BNC Connectors


Powder Coated Free Cases for CPU and Sensor.



 PM4:  Tech Information Documents


PM4 Tech info document PM4: 500MHZ RF POWER Meter with Graphic LCD
PM4 Graphic CPU Firmware Document by Tony/I2TZK PM4 Firmware by Tony/I2TZK
Graphic CPU-0613 Schematic JPG
Graphic CPU-0613 Tech Info Doc 0-500MHZ RF Sensor Document
Graphic CPU-0613 Kit Parts List 0-500MHZ RF Sensor Document


PM4 Sensor Board kit Parts List 0-500MHZ RF Sensor Document
PM4 Sensor Board Schematic JPG
PM4 Calibration Procedure by K7SFN

0-500MHZ RF Sensor Document

 PM4 PIC Firmware User Document
PM4 User Document by I2TZK 

0-500MHZ RF Sensor Document


PM4 PIC18F4550 Firmware for Graphic CPU V1.02

Visit I2TZK Web Site


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