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 Amateur Radio Frequency Measurements:

 QRP Dual Channel LCD 10W HF SWR Meter USB

 

Project by:

TONY / I2TZK, Frank / K7SFN , Dinesh / VU2FD

SWM3-QRP: QRP SWR METER WITH BUILT-IN HF BRIDGE

PCB REVISION: 1021

Dual Channel LCD SWR Meter SWM2 and SWM3-USB were a great success. Hundreds of Radio amateurs built it with success. With more and more feedback pouring-in and many demanding an SWR Meter exclusively for QRP users, 10W range, USB/Battery Powered, etc, Tony/I2TZK decided to go for a scale down version of PIC18F4550 for this project. 

Click picture for enlarged view (Thanks to Ben/PA2ST for nice picture)

Click picture for enlarged view (Thanks to Ben/PA2ST for nice picture)

(Thanks to Ben/PA2ST for nice picture)

SWM3-QRP is an USB or Battery Powered CPU. Based on Microchip's PIC18F4550 40DIP Chip. 

This new QRP SWR Meter is developed keeping in mind demand of QRP operators looking for a small, power efficient, stand alone SWR meter for 10W class HF Radios. This project fulfills that objective.

SWM3-QRP has in-built QRP HF bridge. An optional second bridge may be connected to D9M connector: A bridge like HFB3 for HF or make your own VHF Bridge. 

Firmware for SWM3-QRP Dual channel LCD SWR Meter presented here is developed by Tony / I2TZK for the ham community which is basically, a scaled down version of full SWM3 -USB firmware. 

Tony/I2TZK has removed following capability of original firmware (SWM3) to match this hardware: 

1. No PC Connectivity 

2. No Configuration of PIC Parameters thru PC

Purpose of this project is to encourage radio amateurs to build their own SWR Meter at a low price.  

SWM3-QRP has following features:

Simple, single Micro Controller: PIC18F4550
 
Dual channel of Power Measurement possible. (Only one channel is used in this hardware: Built-in QRP HF Bridge)
  
Dual Power: USB or 9V Battery
  
CPU Unit has:
 
2 x 16 LCD with Back light control  
Stable Reference voltage.
Built-in HF 10W Balanced Bridge
SWR, FWD, POWER and Actual Power to antenna   calculations/Display.  
Bar Graph mode for SWR & Forward Power  
9V Battery Holder on main board
Front panel selection of USB or 9V battery operation
 

Project Bases:

Project is developed on Two Double-Sided PTH boards. The first one is CPU board where LCD, Regulator, Battery, HF Bridge and Back Light Controllers are located. This board is powered by 5V from either USB or internal 9V battery.

Second board is for Front panel push buttons and ON/OFF and USB/Battery Switches.

BNC PCB Type of connectors are used for HF and A D9 Connector is used for second optional brodge.  

Kit is intended for experienced Radio Amateurs. 

Although, rated at 10W HF, this meter & bridge may work  at higher RF Power. There is always a possibility to flash SWM3 firmware into SWM3-QRP PIC to get PC connectivity and ability to configure this CPU for your own specific purpose. 

 

 Completed SWM3-QRP with 10W HF Balanced Bridge:
 

Click the image to enlarge (Thanks to Ben/PA2ST for nice pictures)


 HF Balanced Bridge for SWM3-QRP:
 

Click the image to enlarge

 SWM3 Schematics, Tech Details & Parts List:

        

SWM3-QRP-CPU Tech Info Doc. 0-500MHZ RF Sensor Document
    
SWM3-QRP-CPU Schematic & Parts List 0-500MHZ RF Sensor Document
   
SWM3-QRP-CPU Schematic JPG
     
SWM3-QRP-10W HF Balanced Bridge Schematic

JPG

 

  LAST SWM3 QRP DOCS
LAST VERSION DOCS

  
 SWM3 PC Software, Firmware and Documents
I2TZK Web Site

 
 

SWM3-QRP Firmware V1.0 for PIC18F4550

  
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  USD
 
   
SWM3-QRP-Kit with 10W HF Bridge  60.00
SWM3-QRP Kit Parts
Assembled not available
 
 

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