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 Amateur Radio Frequency Measurements:


 0-30MHZ RF Power Measurement:

Dual Channel LCD SWR Meter By I2TZK, K7SFN & VU2FD


Project by:

Antonio Alfinito / I2TZK

Frank Dziurda / K7SFN 

Dinesh Gajjar / VU2FD




Last LCD HF SWR Meter PIC877A Project is here.......

This project also listed at:.....


Measuring SWR at HF from 1MHZ to 30MHZ  was always a concern to radio amateurs. Thousands of radio amateur run their station without an SWR Meter, not knowing what is happening between their TX and Ant.

SWR Meters of Analog variety are planty, although, not very economical. LCD meters are more expensive, crossing a range of over $200 or more.  

Project & Firmware for Dual channel LCD SWR Meter presented here is exclusively developed by Antonio Alfinito / I2TZK for the ham community. Project meet many simple task using a PIC16F877A micro controller. 

A PC Software and Bootloaded Firmware is provided free of charge for the ham community. Purpose is to encourage radio amateurs to build their own SWR Meter at a low price.  


I2TZK PC Software / PIC Firmware achieved following design task:  

Simple single Micro Controller with built-in A/D converter (PIC16F877A)
Interchangeable HF Simple, HF Dual Scale and a 144MHZ RF Bridges
CPU Unit has:
2 x 16 LCD with Back light control  
Stable Reference voltage.
D9 Connectors for Bridge
SWR, FWD, POWER and Actual Power to antenna   calculations/Display.  
Bargraph mode for SWR & Forward Power  
Simple detection of the port where the LCD Unit is connected.
Graphic interface to display data read from the LCD Unit: Digital and Analog Meter, Compact and Test window.
Emulate the buttons of the LCD Unit and send relevant commands to switch the unit to any operative mode.
Configure the computational parameters of the LCD Unit (CPU)
Collect data for statistical analysis
PC Software & Data-logger views:
Software V2.01  


Click to enlarge

Project Bases:

Project is developed on two double-sided PTH board. The first one is CPU board where LCD, Regulator and Back Light Controllers are located. This board receives pure DC level from sensor (Bridge) board for calculation & display.

The second board is RF Bridge, where power from your transceiver comes in and goes out to antenna. Varity of Bridges are offered. Please refer to capability of each Bridge in related documents.

SO239 types of connectors are used but Type N may be offered as an option.  

Kit is intended for experienced Radio Amateurs. 

Although, rated at 100W HF, this meter & bridge works very well at a KW  or two, on all bands. Readings were very accurate compared to commercial SWR Meter. 

A simple powder coated case for CPU and bridges (HF Simple, Dual scale & VHF) are now available and offered free of charge with kit or assembled. 

Powder Coated Metal Case for HF Simple, Dual Scale and VHF Bridges 

Dual Channel LCD RF Power Meter CPU Unit:

Click the image to enlarge

HF Simple Bridge:

Click to visit project page

HF Dual Scale Bridge:

Click to visit project page

Schematics, Tech Details & Parts List:


SWM2-CPU Tech Info Doc. 0-500MHZ RF Sensor Document
SWM2-CPU Schematic & Parts List 0-500MHZ RF Sensor Document


HF Simple Bridge Schematic & Parts List 0-500MHZ RF Sensor Document
HF Dual Scale Bridge Schematic & Parts List 0-500MHZ RF Sensor Document
144MHZ / VHF Bridge Schematic & Parts List

0-500MHZ RF Sensor Document

Firmware & PC Software Documentation V2.02 by Tony / I2TZK

0-500MHZ RF Sensor Document

Calibration procedure for HF Bridge by Frank/K7SFN

0-500MHZ RF Sensor Document


Must Read: A very nice setup doc by an experienced user/kit builder

0-500MHZ RF Sensor Document

Review by Camradio Group

Pictures of Completed SWM2 by DL7WA

Better than what I make!!



 PC Software and other Downloads
I2TZK Web Site

I2TZK PC Software for Dual Channel SWR Meter  V2.01

PIC16F877A Firmware V2.01 (Full & Update)

SWM2 CW Test on Youtube

Previous Version 1.10 Software, Firmware and update guide

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For online payments, shipping charges will be added on secure web page, which are from $5.00 upwards for Registered Air Mail, based on total value (Multiple kit purchase) of the KIT/Assembled.

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Please consider SWM3 CPU

Kit Parts List

PCBs for this project may be available from our school project shop at foxdelta.net Visit Foxdelta.net


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