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 Amateur Radio Frequency Measurements:

 

 0-500MHZ RF Power Measurement:
 
 AD8307 Sensor for PM3
PIC 16F876 LCD Power Meter PM2 
PIC16F876A LCD RF POWER METER PM3
PIC16F877 LCD HF/VHF SWR Meter
 

 

 0-500MHZ RF Sensor uses an AD8307:
END OF PROJECT
PLEASE REFER TO NEW RF METER PROJECT: PM4
 

Having a device to measure RF Power is always a requirement of RF Engineers & Amateur Operators, especially those having desktop activities related to home brewing!

Measuring RF power was always tough job. We are familiar with 1N94A or 1N270 RF probes.

Analog Device AD8307 is a small 8 pin IC having true V/DB characteristic making it an immediate choice for a simple but high quality signal measuring device for amateur station workshops.

This device requires 5V and a good PCB layout. I made this project based on application notes and IC datasheets provided by Analog Device. PCB is PTH Double Sided and except one AD8307, which is a SMT parts, all other components are thru hole type.

In view to have future expansion, Board has two BNC input Sockets & uses two AD8307s. 

To make kit builders happy, I will supply one AD8307 (Which is SMT) pre-soldered on Kits and the second AD8307  (a DIP package) may be inserted by user/kit builder, at later date.

Although, use of SMT capacitors and resistors are suggested & logical for the frequencies covered, I have used thru hole parts keeping in view simple home brewing PCB project which completes faster than with SMTs and keeping in mind the requirements of accuracy involved in amateur radio measurements.

+5V power for this board is Acquired from associated LCD Power Meter detailed below thru a 10 wire ribbon cable. 

If you are using this sensor as stand alone with a DVM as measurement unit, you will require to supply +5V to this board.

Uses:

Although designed to drive the associated LCD RF Power Meter , this sensor board may be used with your digital multi-meter to measure RF Power up to 500mhz.

By using suitable "Pick-up" unites or by connecting necessary attenuators, possibilities exist to measure RF power levels to 1 or even 10KW of RF.

 

Picture of the Completed Sensor Board:

Click the image to enlarge

 
Schematics, Details & Parts List:
 
 
Schematic

JPG

 
DIP Sensor Kit parts List

 
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DIP PCB, SMT PCB and DIP Full Kits without AD8307 available.

 

Please Consider PM4 Sensor Board KIT

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