Jun 24, 2015 ad8307 rf power meter probe is used to measure the strength of rf power and may be mounted in a small metal enclosure. Ad8307 rf decibel power meter circuit electroschematics. Rf drivers ita s ideal for applications that involve rf susceptibility testing, antenna and component testing, communications, watt meter calibration, plasma generation, particle accelerators, and for use as a driver for high power amplifiers. I recently posted about a small analog swrpower meter i got from ebay, and figured it needed some improvement. Output is displayed in dbm, watts nw, uw, mw and w range as well as input voltage. This sketch will readout rf power and swr from any swr bridge for example monimatch type. I should note that this prototype uses a true nano, it contains a. Mar 28, 2016 this sketch will readout rf power and swr from any swr bridge for example monimatch type. Before ad8307 rf power meter can be used the following drivers must be installed. Why did i built it im a member of the model aircraft c19lub fms spaarnwoude near amsterdam and i started building and flying drones. Code is based on sketch of mike richards g4wnc and adapted for use with an i2c oled display, some display functions added. Because my primary interest was for vhfuhfshf, i have foreseen positions for 6m, 4m, 2m, 70 cm, 23cm and cm bands.
Kees k5bcq has designed a standalone power and swr meter based on ad8307 chips for a standalone oled and arduino nano. Usb rf power meter is based on popular ad8307 watt meter ic and pic18f2550 microcontroller. Jan 11, 2017 arduino power by 12v power plug, 5v power 1602 display, hl8012 wattmeter breakout. Usb 0500mhz rf power meter with ad8307 using pic microcontoller. Make an arduinobased power and swr meter for amateur radio.
Ad8307 probe should be connected to usb io board by using three wire cable. Unfortunately, accurate, wideband models are fairly expensive. It is designed to operate as an inline power meter and displays the results on a 16 digit lcd display. The below is based on a very popular power meter by wz7oiw7pua, described by in qst in june 2001. Simple rfpower measurement making power measurements from. I had the layout for the power meter part of the specam and the arduino and display that i had done for the dummy load wattmeter. The output signal taken from line 8 of the rj45 connector is connected to pin d6 rx of arduino while the input signal on line 7 of the rj45 connector is connected to pin d7 tx of arduino. Aug 21, 20 the shield is powered thanks to arduinos 12 v. The ad8307 voltage output connects to the arduino a0 pin include the library code. Listed under the technical reference arduino category that is about ham radio arduino projects. The arduino based wireless power meter is a noninvasive current meter for household power with a matlab interface.
A very simple to build, menu driven rf power meter, based. A meter that reads 5v at w power will have a resolution of about 1w. N2pk also has an interesting design for a forward power and return loss meter. A very simple to build, menu driven rf power meter, based on the ad8307 log amp. After finishing with a simple vswr plotter using an arduino pro mini and a tft, i decided to improve the rf measurement section of the analyser with an ad8307 based power rf meter. If you build the meter using the same voltage reference and component values in front of the ad8307 as indicated in the diagram above, then i would expect reasonable accuracy with the parameters used by default in the firmware. The main category is ham radio arduino projects that is about arduino projects for ham radio applications.
If you dont have access to a quality signal generator, you can calibrate the power meter using a lowpower transmitter. A very simple to build, menu driven rf power meter, based on. As this monimatch type of bridge is frequency dependant, the meter must be calibrated for every band. Discussion in general technical questions and answers started by k9fv, dec 12. To measure output rf power of transmitter connect ad8307 probe input directly to the output of your transmitter antenna output. Left power switch, middle mode select pushbutton, right band change pushbutton. There is no filtering on the power detector so it can measure from very. Im a member of the model aircraft c19lub fms spaarnwoude near amsterdam and i started building and flying drones. An diy rf decibel or power meter is an indispensable instrument in any radio workshop. About arduino power and swr meter the resource is currently listed in in a single category. Arduino power by 12v power plug, 5v power 1602 display, hl8012 wattmeter breakout. Psm300040005000 rf and microwave power sensor power meter. An ad converter of 12 bit convert the analog output from the ad8307 to a digital number.
The measurand quantity to be measured is applied to pin 8 inp of ic1 via input socket k1 and capacitor c1. This link is listed in our web site directory since thursday sep 26 20, and till today swr wattmeter with arduino uno shield has been followed for a total of. Rf power meter with arduino, ad8307 and oled by rudi imbrechts on7ir january 2019. The power meter the cornerstone of the powermeter circuit shown in figure 1 is an analog devices ad8307an logarithmic amplifier. Mar 21, 2015 before ad8307 rf power meter can be used the following drivers must be installed 1 download drivers and unzip it 2 connect rf power meter to computer using usb cable. Digital wattmeter with ad8307, pic16f876, lcd display. Attach the transmitter through the tap to a dummy load where the output voltage can be read directly using a di. He used a pic to convert the dbm readings back into watts and to calibrate the device, too. This link is listed in our web site directory since wednesday aug 3 2016, and till today arduino power and swr meter has been followed for a total of 2971 times. Make an arduinobased power and swr meter for amateur radio the arduino platform lends itself nicely to other pursuits, and one of these is amateur radio. Smeter and power meter design with separate display kees k5bcq has designed a standalone power and swr meter based on ad8307 chips for a standalone oled and arduino nano.
A lot of people have done the open source power meter with arduino. I have a cts crystal oscillator 50mhz mxo45hs50m000 dip8, ive read that this crystal allows me to make a signal generator of 10dbm to calibrate the ad8307 with 50 mv. I was looking for pic mcus and found that pic16f876 is going to nrnd, so after this i found it was the best time to start this project. How to create an intelligent, web enabled, power meter. The desig is simple and is popular among hobbyists. Ad8307 series logarithmic amplifiers are available at mouser electronics. A simple digital power meter warrington amateur radio club. Smeter and power meter design with separate display ubitx. Whether we are tuning up homebrew equipment, checking antenna vswr, adjusting a linear amplifier, or just monitoring output power during a contest, almost all aspects of ham operation can use a power meter. Digital rf wattmeter with lc display for 1 khz to 1 ghz design by thomas scherrer oz2cpu. Test the code in an simulated environment by simulating the input voltage with an potmeter. Arduino code for 0500mhz, 1nw to 100w rf power meter mike. But, lets analyze the serial line coming from the fr491 central controller. It is not just wattmeter, it is a 3 channel power switch with meter function per each channel.
Oct 22, 2015 an rf power meter is a device which you can use to measure the power a transmitter outputs. The circuit diagram of the decibel meter in figure 1 stands out by its simplicity, which is due to the type ad8307 monolithic demodulating logarithmic amplifier, ic1, from analog devices. The power is measured by the circuit ad8307 over a 50 ohm dummy load. Swr wattmeter with arduino uno shield resource detail. I originally set up this board to work with the circuitry in qex article may june 20 by loftur jonasson tf33ljve2ljx, squeeze every last drop out of the ad8307 log amp pp. Rf power meter with arduino, ad8307 and oled by rudi imbrechts. Keep this in mind as you set the full scale voltage of your transducer. Transfer the code from funduino uno board to a arduino mini board. The hardware was kept easy, as the calibration interceptpoint, voltage per db shall be done in the software. The circuit is based on two ad8307 log amplifiers, which are connected to the forward and reflected ports on a directional coupler the ad8307 amplifiers gives a dc voltage of about 25mvdb of the input signal, which is amplified using an opamp lm324.
I always wanted to build a rf wattmeter with the ad8307 and oz2cpu design. Apr 21, 2014 here is yet another ad8307 based rf power meter which adds an opamp to produce a dc output voltage of 1mvdbm e. I got hold of an ad8307 in smd form, too small for me. This article describes a simple to build, yet potentially accurate digital power meter. The ad8307 voltage output connects to the arduino a0 pin. There is no filtering on the power detector so it can measure from very low frequencies to 500mhz. The dds is an ad9851 running at 150 mhz and the logarithmic detector is a ad8307. Im using the arduino environment which is based on c language as i understand anyway. Low cost, dc to 500 mhz, 92 db logarithmic amplifier data. That gives you 1024 possible voltage measurement steps from zero to full scale, or about 0. Based on the analog devices ad8307ar chip, this module is a complete rf power meter head for 50 ohm systems working from very low frequencies to more than 500 mhz. The ad8307 amplifiers gives a dc voltage of about 25mvdb of the input signal, which is amplified using an opamp lm324. Make an arduino based power and swr meter for amateur radio the arduino platform lends itself nicely to other pursuits, and one of these is amateur radio.
I currently own an octocopter with 1 m span and added a camera with gimbal and a live video link to it. To download any of the files below, please click on the. 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. This instrument can be used and calibrated from 1 khz and up to 500 mhz it is possible to measure power relative all the way up to 900mhz a software routine can calibrate the 0dbm point at 5 different frequencies to make this instrument accurate within 0. Receiver signal strength indication rssi low cost radar and sonar signal processing. Rf power meter with ad8307 circuit wiring diagrams.
So the challenge was to try some ugly construction using a piece of copperclad. Here is the code for the arduino inline power meter that will feature in my data modes column in the august pw. First, download the arduino environment, including the teensyduino. Power meter, wattmeter module, read by arduino youtube.
About swr wattmeter with arduino uno shield the resource is currently listed in in 2 categories. Arduino code for 0500mhz, 1nw to 100w rf power meter. The design is based around the ad8307 log amplifier, but the amplifier is housed in a separate box from the microcontroller and lcd to prevent it from picking up noise. The circuit is based on two ad8307 log amplifiers, which are. The driving part of the program is the adcinterrupt routine. Wattmeter board ac main in from power socket, out to a hair dryer. Here is yet another ad8307 based rf power meter which adds an opamp to produce a dc output voltage of 1mvdbm e. Homebrew swr and power meter first of all, this swr meter in this article is. Arduino based swrpwr meter experimental engineering. Contribute to hsiboy ad8307 lcd meter development by creating an account on github. To do this, all the meter needs is two accurate signal levels, 30 40 db apart, as calibration points. The meter is indented to be battery powered, therefore there is a circuit to control the lcd backlight drawing a lot of current and monitor the battery voltage. It measures, in one range, power from 100 nw to 100w 9 orders of magnitude covering all hf bands up to 2 metres.
A very simple to build, menu driven rf power meter, based on the. What is it an rf power meter is a device which you can use to measure the power a transmitter outputs. Id refer you to documentation on the u8g2 library by oli kraus. Mar 16, 2018 the circuit is based on two ad8307 log amplifiers, which are connected to the forward and reflected ports on a directional coupler the ad8307 amplifiers gives a dc voltage of about 25mvdb of the input signal, which is amplified using an opamp lm324. For programming changes to the nextion module, the arduino nextion library will need to be added to your library folder under your working arduino folder set. Current is measured using split core current transformers. Removing the dummy load portion of that board i was able to import the ad8307 power meter circuitry with only a little change in the original layout.
Its a ad8307 rf wattmeter from oz2cpu in a pcb that can be placed on a hammond 1590b box. The adcinterrupt routine is called by the analog to digital converter each time a conversion is finished and the results are available. Oct 25, 2015 after finishing with a simple vswr plotter using an arduino pro mini and a tft, i decided to improve the rf measurement section of the analyser with an ad8307 based power rf meter. I just downloaded the footprint file uncritically from the internet without checking it. Portable rf sniffer and power meter paul wade w1ghz 2003, 2004 rf power meters are extremely useful instruments. The arduino code is on the original authors page above, his restrictions forbid me to reproduce it here.
The output signal taken from line 8 of the rj45 connector is connected to pin d6 rx of arduino while the input signal on line 7 of the rj45 connector is connected to pin. I wanted a board that could be mounted in a remote enclosure or could be put in a self contained box with the rest. A meter that reads 5v at 100w power will have a resolution of about 100mw. The rf power in dbm can be read directly with a multimeter, and ive found it particularly useful for measuring rf filter response when combined with a sweep generator and an oscilloscope. To calculate the power into dbm you need some mathematical calculations. The same circuits can be used for the rf power coupler and the ad8307 as in the. Smeter and power meter design with separate display. Ad8307 module for rf power meter rssi for arduino or other. How to create an intelligent, web enabled, power meter with.
Windows 2000 xp under windows 2000 or xp you will be prompted twice to install two. Ad8307 usb 0500mhz rf power meter allows to measure the power of transmitters from 1nw to 2w 50w with 40db attenuator. Since the ad is a12 bit ad you will have 4096 combinations. Product description ad8310 15 ns response time, buffered output adl55 lower input range 80 db, operation to 4 ghz, higher power consumption. May 21, 2014 download the arduino wattmeter code here. A wattmeter can be used to measure gain in amplifiers, bandwidth in. The power detector is an analog devices ad8307 along with a 50ohm input load. The ad8307 operates over the industrial temperature range of. The opamp also provides the reference voltage to the arduino aref to ensure that the full ranges of the ad converters are used. The best way to test these would be to build a simple power meter.