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 Amateur Radio Frequency Measurements:


 0-30MHZ RF Power Measurement:


 Dual Channel LCD SWR Meter SWM3 USB



Project by:

Tony / I2TZK, Frank / K7SFN , Dinesh / VU2FD

Previous Project SWM3-0511 is here.....


SWM3-0915 is an USB / DC12V Powered SWR Meter. Project is Based on Microchip's PIC18F4550.

SWM3-0915 is redesigned (from last version) keeping in mind existing HF and VHF Bridges and popular demand of Radio Amateurs looking for simple SWR measurement for their station Radios.

Firmware and PC Software (WinXP/WIN7) for SWM3 is developed by Tony / I2TZK and offered free of change for the Amateur Radio Community. 

Purpose of this project is to encourage radio amateurs to build their own SWR Meter at a low price.  Keeping this in mind, we have avoided use of SMT parts.

SWM3-0915 has following design task:  

Simple single Micro Controller with built-in A/D converter (PIC18F4550)
Supports: HF Simple, HF Dual Scale, HF Balnced, HF Balanced 2KW Bridge and a 144MHZ RF Bridges
CPU Unit:
 2 Channels: Can connect to Bridges at same time
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  
Configure the computational parameters of the LCD Unit (CPU)
Collect data for statistical analysis
Works without a PC as a Stand alone with external 5V supply from USB port or DC12V adapter.


PC Software & Data-logger views:
Software V2.05 (WinXP/WIN7)  


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. A good quality D9 cable will make difference.

Varity of Bridges are availble. Please refer to bridge webpage for more details....

This kit is intended for experienced Radio Amateurs. 

SWM3 is 100W / 1KW HF/VHF  SWR Meter. Dual scaling (measuring 100w and 1KW on same channel) is possible when used with dual scale HF Bridge. Readings were very accurate compared to commercial SWR Meter. 

A simple powder coated case for SWM3 and bridges are available and offered free of charge with kit or assembled. 

SWM3 is also availble as "Assembled" at the price of a kit to Senior Radio Amateurs.


 SWM3-0915 Dual Ch LCD SWR/Power Meter CPU Unit:

Click the image to enlarge

 Available Bridges for SWM3 CPU
HFB5 1KW Balanced Bridge
HF Dual Scale Bridge
HFB3: HF Balanced Bridge 100W
Have a look at all the available bridges
 SWM3-0915 Schematics, Tech Details & Parts List:


SWM3-0915 Tech Info Doc. 0-500MHZ RF Sensor Document
SWM3-0915 Schematic & Parts List 0-500MHZ RF Sensor Document
SWM3-0915 Schematic



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

 SWM3-0915 PC Software, Firmware and Documents
I2TZK Web Site


SWM3 SOFTWARE V3.00, PIC4550 Firmware V3.00 

Note: Present kits are supplied with firmware V3.00   

Last Version V2.06 files 

 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. (based on total value of the KIT/Assembled)

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Buy Online     

USD BUY from 2CO

SWM3-0915 Complete Kit with Free case  55.00

2CheckOut.com Inc. (Ohio, USA) is an authorized retailer for goods and services provided by Fox Delta.
SWM3-0915 Kit Parts List
You can select at checkout:
Assembled at extra USD10
LCD Color: Blue or Green
Case Color: White or Maroon
Free assembled for Senior Radio Amateurs
No bridge is supplied with SWM3-0915 kit.  Buy a suitable bridge  from the link below. (or build one yourself)
HF & VHF Bridges suitable for SWM3 CPU:


OR Visit our Paypal Direct Shopping Section               



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


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