Project by:

Antonio Alfinito / I2TZK

Frank Dziurda / K7SFN 

Dinesh Gajjar / VU2FD

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 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 HF Simple, Dual Scale and VHF Bridges 

Note: Case for Balanced Bridge is not available. (PCB size is different from other bridges)

Click the image to enlarge

HF Balanced Bridge: 

Click the image to enlarge

Click to enlarge

Click to enlarge

JPG

To purchase, please select online payment buttons below or send payments by USPS Money Orders.

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.

"Buy from 2CO", you may pay using your CC or funds from Paypal.