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 Amateur Radio Frequency Measurements:

 

0-500MHZ LM3914 RF Power Meter:

New PM1A project is here.........
 

PM1:

 

RF Measurement has been an expensive work so far the cost of measuring instruments are concerned.

Although, the other project, PM2, is hot favorite among radio amateurs for RF Measurement, I wanted something smaller & more economical for measurement of RF Signals.

In this project a quality Double Sided PTH Board is used measuring only 3cm x 10cm in size. 

Same good old AD8307 from Analog Devices is used (DIP Package) for basic RF measurement up to 500MHZ from -70dbm to +10dbm. 

However instead of using a PIC and LCD, I am using a simple LM3914 Bar Graph IC for display of db levels.

Note:

Schematic has one error where D2 is inverted. Silk on PCB is correct.

Click to enlarge
Schematics, Details & Parts List:
 
PM1 Power Meter Schematic and Tech info Doc 0-500MHZ RF Sensor Document
 
PM1 Power Meter Schematic JPG
Error: D2 inverted
 
Project Datasheet 

Analog Device AD8307 Datasheet

 
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