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 Amateur Radio Frequency Measurements:


0-500MHZ LM3914 RF Power Meter:

PM1A Rev1212:

RF meter and Wide Dynamic Range Field Strength Meter


Although, the other project, PM3 and FC3 are hot favorite among radio amateurs for RF Measurement, I wanted something smaller & more economical for measurement of RF Signals accurately using an LED Driver LM3914 and Log amplifier AD8307.

In this project a quality Double Sided PTH Board is used measuring 65cm x 110mm in size powered by a 9V battery.

Bargraph LEDs (10) are used in this project which may be mounted on either side of the PCB to facilitate mounting of this project in a user preferred custom case.

AD8307 from Analog Devices is used (SO8 Package) for basic RF measurement up to 500MHZ from -70dbm to +10dbm. To increase measurement range, a 20db switched attenuator is available.

Completed PM1A RF Meter and Field Strength Meter:

Click to enlarge
LEDs may be mounted on Component side or on the back of PCB. A small cutting on metal box cover is required.

click to enlarge
 PM1A-1212 Schematics, Details & Parts List:
PM1A Power Meter Schematic and Tech info Doc and Kit Parts list 0-500MHZ RF Sensor Document
PM1A Power Meter Schematic JPG

0-500MHZ RF Sensor Document




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