A Wide Dynamic Range Power meter using a Directional Coupler, AD8307 Log Amplifier and Arduino Microcontroller. Anyone experimenting with antennas or Power Amplifiers will need to measure RF power at some point. Indeed, Radio Amateurs should have some means of measuring RF power to ensure they are operating within their Licence conditions.

Revised AD8307 RF Power Detector rev2.03 Based on a design by W7ZOI and W7PUA with enhancements suggested by WØMNE This new PCB layout of the power meter incorporates some features that should improve the isolation of the RF front end as well as allow for a more convenient installation of a shield cover over the front end.

AD8307 Measuring circuit: The 1.8 kOhm resistor is parallel to the 56 Ohm resistor (circuit diagram above), together with R8 and the input resistor of the AD8307 is reached to 50 Ohm. At the solder terminals JP2 and JP3, a voltage corresponding …

Jun 11, 2016 · The same circuits can be used for the RF power coupler and the AD8307 as in the original Power and SWR Meter Project, however a few new builds are shown below. Alternately, a coupler with diode...

that also calculates and displays SWR. Shortly after reading this article, I noticed several articles in QST that described a new integrated circuit, the Analog Devices AD8307, that converts a QS1101Kaune01low level RF signal into a voltage proportional to the logarithm

Feb 13, 2015 · A friend of mine, Dick Benson, W1QG, built a pretty cool combined Forward and Reflected Power and SWR meter using two AD8307 Logarithmic Amplifier chips from Analog Devices. He used a PIC to convert the dBm readings back into watts (and to …

The most popular design of Power Meter is the AD8307 scheme by By Wes Hayward, W7ZOI, and Bob Larkin, W7PUA on QST June 2001. And Bob Kopski, K3NHI published another very interesting project base...

Replace "matching" potentiometers with fixed "RR" resistors if that makes sense. The signal is sampled by a directional coupler with 44 dB of attenuation which permits measurement from 10 microwatts to 25 watts. A voltage divider on the output of the detectors scales the range to take better. long OR connect Vin to a 7.4V Radio Control LiPo.

Mar 5, 2025 · The AD8307 will fade out at low signals of about -75 dBm and its maximum input power is +16 dBm. A test showed that this instrument is usable with very good results in the range -70 dBm (0.1 nW) to +16 dBm (40 mW). A friend allowed me to test the power meter using his hp 8640B generator.

2KW AD8307 Power-SWR Directional Coupler 1.8-54Mhz. The board consists of a Tandem match Directional coupler. The transformers are wound on 46 material cores with 24:1 ratio which is then attenuated 25db by a resistor pad. The Signal is then fed into 2 x AD8307 Logarithmic amplifiers. Requires 12v DC. Designed and manufactured in Australia.