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 Amateur Radio Frequency Measurements:


  0-500MHZ RF Power Measurement:


 128X64 Graphic LCD General Purpose CPU


GCPUx : General Purpose PIC CPU

Project by:

Tony / I2TZK, Frank / K7SFN , Dinesh / VU2FD

GCPUx is an expandable CPU and Graphic LCD project which has provision to "add" a "project" board to create a full function amateur radio station accessory.

Advantage of "GCPUx" concept is a possibility to add new project board, change processor code and have a new working unit for your ham station. 

Present add-on board designed and will be available are: PM5 (RF Power Meter), SWM5 (SWR Meter) , FC5 (Freq Counter+RF Meter) and AAZ5 (Antenna analyzer)

Note: GCPUx is not compatible with AAZ-0914A Antenna Analyzer (and other "Infinity" projects). A small interface board and change in firmware is required. update FW and interface board are under development.

GCPUx has following design task:  

Simple single Micro Controller with built-in A/D converter (PIC18F4550)
Support add-on board: PM5, SWM5, FC5, AAZ and more...
Operates on DC12V,  USB or Internal battery*.
Provision for 7.2V NiMh/NiCad Battery on roof for Standalone operation
Bluetooth operation for smart phones (Depend on FW)
4 A/D channels and 4 Digital channels ready for Project Board
One Frequency Measurement Channel.
Simple 4 Button Menu operation
Graphic LCD 128X64 with backlight
Battery board uses MAX712 for charging (Option)
Free Powder coated metal cases


GCPUx Internal View:
Click to enlarge

Add-on project boards for GCPUx:

GCPUx + "add-on boards" are the project boards that make it a working unit. They are:

PM5 - 500MHZ 2CH RF Meter + Frequency Counter

SWM5 - 2 CH SWR Meter

FC5 - 500MHZ Frequency Counter + RF Meter

AAZ5 - Graphic LCD Antenna Analyzer

Example: GCPUx with PM5 "add-on" board fitted:

Click the image to enlarge

 GCPUx Back Side Connections and switches:

Click the image to enlarge

 Battery Charger Board for GCPUx Projects

Click the image to enlarge
 GCPUx Schematics, Tech Details & Parts List:


GCPUx Tech Info Doc 0-500MHZ RF Sensor Document
GCPUx Schematic and Parts List 0-500MHZ RF Sensor Document
GCPUx Schematic


GCPUx Connector Pinout

0-500MHZ RF Sensor Document

GCPUx Battery Board Tech Info

0-500MHZ RF Sensor Document

Battery Board Schematic


Battery Board Kit Parts List

0-500MHZ RF Sensor Document

 GCPUx Data sheets:
74HC14 0-500MHZ RF Sensor Document
PIC18F4550 0-500MHZ RF Sensor Document
74HC165 0-500MHZ RF Sensor Document
2N3563 0-500MHZ RF Sensor Document
Graphic LCD 128X64 0-500MHZ RF Sensor Document
LM2940 0-500MHZ RF Sensor Document
MAX712 0-500MHZ RF Sensor Document
BD678 0-500MHZ RF Sensor Document
 GCPUx PC Software, Firmware and Documents
FW/SW for GCPUx "add-on" projects are written by Tony/I2TZK and are specific to add-on project boards. Visit add-on board pages for FW download:

PM5   SWM5   FC5   AAZ5


 Buy On-Line

To purchase, please select online payment buttons below: 2CO or Paypal.

For online payments, shipping charges will be added on secure web page, from $5.00 upwards for Registered Air Mail or EMS Speed Post, depending on your country. (based on total value of the KIT/Assembled)

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Buy Online     

USD BUY from 2CO

GCPUx-0815 Complete Kit with Free metal case. Without add-on project board 50.00

2CheckOut.com Inc. (Ohio, USA) is an authorized retailer for goods and services provided by Fox Delta.
GCPUx -0815  Parts List
You can select at checkout:
LCD Color: Blue or Green
Case Color: Blue or Chocolate Brown
Want Battery Board Kit or not +10
GCPUx kit is basically for experimenters who wish to make their own add-on board and write own code for PIC18F4550. 

Visit following pages to buy complete kits of the projects that uses GCPUx kit as part of it:

PM5   SWM5   FC5   AAZ5



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2CheckOut.com Inc. (Ohio, USA) is an authorized retailer for goods and services provided by Fox Delta.


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