Description

Automatic SWR meter with only 2 dig 7-seg display

The standing wave ratio meter is based on the ATMega8 or 48 microcontroller. Connects to SWR brige of any design. The inputs are connected to the measuring line in any order. The program itself will determine the direct and reflected channels. For normal operation of the SWR meter, it is necessary that the output voltage of the measuring line does not exceed 4.5 volts.

The device takes continuous measurements and displays SWR values from 1.0 to 9.9. SWR > 9.9 is not indicated, “Er” - Error appears on the indicator. If there are no signals at inputs 1-2-3, the indicator shows “—“. The device is powered either from an external power source with a voltage of 5 V example from mini USB poewr supply, or from batteries with a voltage of 4.5 V.

The microler use internal generator. Fuses do not need to be programmed, are used factory default settings.

Code

Codes for Atmega8

swr_meter_atmega8.tar.gz

Schematic and Layout

Schematic_SWR Meter Atmega8PU 7 seg display.png

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Oct 21,2023

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Automatic SWR meter with only 2 dig 7-seg display

719

Published: Oct 21,2023

Download Gerber file 4

BOM(Bill of materials)

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