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 Amateur Radio Frequency Measurements:


 VHF RF Power Measurement:
Dual Channel LCD VHF SWR Meter
Dual Channel LCD SWR Meter RS232: SWM2
10W LCD SWR Meter with HF Bridge: SWM3-QRP
Dual Channel LCD SWR Meter USB: SWM3
Antenna Matching Balun For QRP Radios
50 Ohms 10W Dummy Load: DL50/10
40db RF Attenuator
PIC16F876A RF Power Meter with Data Logger: PM3
HF/VHF Bridges
Old Projects:
 PIC 16F876A LCD Power Meter: FD-PM2 
PIC 16F877A LCD 100W HF SWR Meter: FD-SWM-HF
Wireless Projects


Dual Channel LCD VHF SWR Meter By I2TZK, K7SFN & VU2FD


Project by:

Antonio Alfinito / I2TZK

Frank Dziurda / K7SFN 

Dinesh Gajjar / VU2FD


Measuring SWR at VHF at 144MHZ is of a great 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 Firmware achieved following design task:  

Simple single Micro Controller with built-in A/D converter (PIC16F877A)
Interchangeable HF Simple, HF Dual Scale, HF Balanced and 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  
PC Software & Data Logger
AUTO Scale


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 VHF Bridges 


Dual Channel LCD RF Power Meter CPU Unit:

Click the image to enlarge



 VHF Bridge
You may find HF Bridges here
144MHZ / VHF Bridge:
Click to enlarge
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


144MHZ / VHF Bridge Schematic & Parts List

0-500MHZ RF Sensor Document

Firmware & PC Software Documentation by Tony / I2TZK

0-500MHZ RF Sensor Document

 Bridge Selection Guide

0-500MHZ RF Sensor Document



 PC Software and other Downloads
I2TZK Web Site

I2TZK PC Software for Dual Channel SWR Meter  V1.10








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