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 Amateur Radio Frequency Measurements:


 0-500MHZ RF Power Measurement:
Dual Channel LCD SWR Meter RS232: SWM2
10W LCD SWR Meter with HF Bridge: SWM3-QRP
Dual Channel LCD SWR Meter USB: SWM3
50 Ohms 10W Dummy Load: DL50/10
Combiner Splitter for PM3A
PIC 16F876A LCD RF Power Meter with Data Logger: PM3
HF/VHF Bridge
Old Projects:
PIC 16F876A LCD Power Meter: FD-PM2 
PIC 16F877A LCD 100W HF SWR Meter

100w VHF / UHF LCD PIC16F88 SWR Meter:


Please consider new project SWM2 or SWM3



Radio Magazine, Greece covered this project in their issue RD-79.

Download Article

Measuring SWR at VHF/UHF frequency was never a fun. Most radio amateurs just assume that their 50 ohms cable is matching a beam or GP.

SWR Meters of analog variety are flooding market, although, not very economical. LCD meters are bit expensive, crossing a range of over $100. Although, even if they include “Antenna analyzer” or something like that, which few of us, use or understand, but certainly pay a price for!!

LCD SWR Meter presented here meet many simple task using a micro controller, especially, dear to all of us, a PIC!!. This time its PIC16F88. The very basic purpose to make this project is to encourage radio amateurs to build their own High Quality LCD SWR Meter at low price, instead of buying expensive ready made units.

Picture of the Completed LCD RF Power Meter:

Click the image to enlarge


RF Meter: LCD Removed

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Main Screen of the 2X16 LCD RF Meter:

Meter will display SWR, Power and on Second line, a Bar Graph.


SWM-VHF Sensor PCB SMT Side View:

 Connector Side View:

RF Sensor/Bridge uses SMD components and two "N" type Brass Sockets. (SO239 may be used)
Schematics, Details & Parts List:
SWM-VHF Tech Doc. 0-500MHZ RF Sensor Document
SWM-VHF Schematic & Parts List 0-500MHZ RF Sensor Document
SWM-VHF Schematic - PIC Board JPG
SWM-VHF Schematic: VHF Bridge Board


Project Datasheet 

Analog Device AD8307 Datasheet

PIC16F88 Firmware

 PCB Available From our School Projects Shop:
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