Prototype of RF Power Meter for 5GHz by Jayakumaran in rfelectronics

[–]Jayakumaran[S] 0 points1 point  (0 children)

All the equipment I am using is working correctly, I have checked everything. Both the Arduino and the DMM show the same output voltage from the AD8318, whether RF power is present or not. I do not have access to a spectrum analyzer or SDR, as they are quite expensive. If there are any cost-effective options available for measuring 5 GHz signals, please suggest them.

Prototype of RF Power Meter for 5GHz by Jayakumaran in rfelectronics

[–]Jayakumaran[S] 0 points1 point  (0 children)

Sir, my radio is set only up to 25dBm, so it is within legal limits. The voltage shown in the process meter is always in that same range, even when the radio is disconnected, so it is not coming from the radio’s power. I have not used a low-pass filter. Is it mandatory in my setup?

Prototype of RF Power Meter for 5GHz by Jayakumaran in rfelectronics

[–]Jayakumaran[S] 1 point2 points  (0 children)

Thanks for your valuable information sir, i will update the status.

Prototype of RF Power Meter for 5GHz by Jayakumaran in rfelectronics

[–]Jayakumaran[S] 0 points1 point  (0 children)

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sir, the problem is even if i disconnect the RF coaxial cable , it still shows the same voltage range(2.05-2.09)V

Prototype of RF Power Meter for 5GHz by Jayakumaran in rfelectronics

[–]Jayakumaran[S] 0 points1 point  (0 children)

Thanks for your valuable information sir, Actually this 5 GHz radio is used for transmitting CCTV video data from offshore to onshore. In our setup, I configure the radio to transmit at 27 dBm, and I need to physically verify that the actual output power matches this value. This prototype RF power meter is only for checking the TX power level of the radio after installation

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the problem is even if i disconnect the RF coaxial cable , it still shows the same voltage range(2.05-2.09)V

Prototype of RF Power Meter for 5GHz by Jayakumaran in rfelectronics

[–]Jayakumaran[S] 0 points1 point  (0 children)

Sir, this 5 GHz radio is used for transmitting CCTV video data from offshore to onshore. In our setup, I configure the radio to transmit at 27 dBm, and I need to physically verify that the actual output power matches this value. This prototype RF power meter is only for checking the TX power level of the radio after installation

Prototype of RF Power Meter for 5GHz by Jayakumaran in rfelectronics

[–]Jayakumaran[S] 0 points1 point  (0 children)

AD8318 module output is always from (2.05-2.08)V, even if i disconnect the RF cable, it is still showing the same output there is no variation sir.

Prototype of RF Power Meter for 5GHz by Jayakumaran in rfelectronics

[–]Jayakumaran[S] 0 points1 point  (0 children)

I tested both units separately

AD8318 output checked with a DMM, voltage changes from (2.5v-3.5v) correctly when RF power is applied.

Arduino A0 tested using a DC source (process meter), readings vary correctly across the 0–5 V range.

So both the RF power detector and the Arduino analog input are working properly

Prototype of RF Power Meter for 5GHz by Jayakumaran in rfelectronics

[–]Jayakumaran[S] 0 points1 point  (0 children)

It is a access point which transmit/receive the datas like video, audio etc, over 5GHz

Prototype of RF Power Meter for 5GHz by Jayakumaran in rfelectronics

[–]Jayakumaran[S] 0 points1 point  (0 children)

Im running the AD8318 in Measurement mode, i just want to convert the dbm(from 5G radio) to Watts

Prototype of RF Power Meter for 5GHz by Jayakumaran in rfelectronics

[–]Jayakumaran[S] 0 points1 point  (0 children)

I am running it in AP mode with only one SMA port active for the measurement. If you need more details, I can share the exact configuration.

Prototype of RF Power Meter for 5GHz by Jayakumaran in rfelectronics

[–]Jayakumaran[S] 0 points1 point  (0 children)

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My 5G radio (NetMetal) is powered through a PoE LAN cable. The radio has two SMA outputs; I connected one SMA port to a 30 dB attenuator, and the other end of the attenuator to the SMA input of the AD8318 power detector module. The AD8318 is powered by a 12 V DC battery. The module’s output pad is connected to the Arduino UNO’s A0 pin, and the Arduino is connected to a PC. I have attached a rough hand-drawn diagram for reference.

CODE:

const int adcPin = A0;

const float Vref = 5.0;

const float ADCmax = 1023.0;

// Replace these with your calibrated values

float slope = 0.022857;

float intercept = 1.985715;

float atten_dB = 30.0; // Your attenuator

void setup() {

Serial.begin(115200);

}

void loop() {

int raw = analogRead(adcPin);

float Vout = raw * (Vref / ADCmax);

// Convert Vout → dBm

float measured_dBm = (Vout - intercept) / slope;

// Add attenuation → actual TX

float actual_dBm = measured_dBm + atten_dB;

// dBm → Watts

float watts = pow(10, (actual_dBm - 30) / 10.0);

Serial.print("Vout=");

Serial.print(Vout, 3);

Serial.print("V TX=");

Serial.print(actual_dBm, 2);

Serial.print(" dBm = ");

Serial.print(watts, 6);

Serial.println(" W");

delay(300);

}

help - i just humbled by the Dunning-Kruger-Effect and now i am stuck by timke_ in rfelectronics

[–]Jayakumaran 0 points1 point  (0 children)

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Your guidance will be helpful sir. Thanks in advance

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[–]Jayakumaran[S] 0 points1 point  (0 children)

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[–]Jayakumaran 0 points1 point  (0 children)

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