# Microwave Radiometer Homebuilt With Low Cost Components and Easy Availability

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## Introduction: Microwave Radiometer Homebuilt With Low Cost Components and Easy Availability

Abstract:

This essay is a source of inspiration for anyone who wants to build a microwave radiometer at home at a cost of 70 Euros.

Summary:

This essay is cause for inspiration to anyone who wants to build a microwave radiometer at home and at a cost of 70 Euros.

For the assembly of this instrument we were used:

- System with CBL probe voltage( voltmeter datalogger )

- Satfinder analog hand (tool for pointing satellite dishes)

- LNB (Low Noise Block = low noise amplifier)

- Connection cables

- AC or battery pack

Keywords and concepts of interest:

- CBL System ( datalogger system )

- Telecommunications

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## Step 1: Introduction

1. Introduction

Fig. 1 electromagnetic spectrum

## Step 2: Methodology and Assembly

2. Methodology and assembly

The system is realized by connecting a low noise amplifier (LBN) to a satfinder (instrument for the pointing of the satellite dishes), modified to be interfaced to the CBL, and using a power supply at 12/20 Volt. The cost of the system is about 70 euro excluding CBL.

The analysis for the realization of the circuit should be made according to certain parameters:

- Voltage limit CBL: -10 V to +10 V

- The actual voltage supplied to the analogue pointer of satfinder, that will determine our sensitivity.

- The analog will be connected to the voltage probe CBL

- The LNB supply that varies from model to model

- Feeding satfinder (compatible with that LNB)

First there must be effective to change the satfinder, soldering two wires to the poles of the analog gauge. The voltage probe of the CBL will measure this potential difference (Fig 4. Modify SatFinder).

1. Connector for LNB

2. Alternate connector for the power supply of the satfinder at 12/20 Volt.

3. Original connector (used for power if you do not make the point 2)

4. Welds on the pins of the analog gauge

5. Output, to be connected to the probe CBL We arrange to provide a power wire, connected to the input of the satfinder, suitably adapted to the needs of the connectors and polarity. Otherwise, as in the picture we provide to provide an alternative connection to the power supply (Figure 4 low-cost model can be found easily on the internet).

Finally we connect the input connector satfinder LNB (Fig 5. Assembled system).

For security, you can enter a suitable impedance block 10 mH inserted between the positive supply and the cable supplying the satfinder.

## Step 3: Data Collection and Conclusion

3. Data collection

You can make radiometric measurements of various sources: here are some examples.

A. Mobile phone, incoming call: sampling was done every millisecond to five seconds.

B. Emissions from a cell tower: sampling was done every millisecond to five seconds.

C. Turn on and off a light bulb: sampling was done every millisecond to five seconds.

4. Conclusion

We have seen how, with little expense, we can investigate in the microwave.In this paper we were presented some examples that suggest the multiple applications of this tool created mainly for amateur use in chemistry, biology, astronomy, meteorology, telecommunications.To give a scientific meaning to the data available, we should adopt a reliable calibration procedure.

## Step 4: Bibliography

Bibliography

[0] My Blog - GiamMa-based researchers SDR R&D IoT

[1] A microwave radiometer for only 50 EUR:

www.iaragroup.org/scuoleeassociazioni/labuniverso/...

[2] Implementation human microwave emission device:

www.crit.rai.it/eletel/2006-2/62-1.htm

[3] Radiometro a microonde interfacciato al CBL:

http://ulisse.sissa.it/biblioteca/saggio/2007/Ubib...

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## 2 Discussions

Thanks for posting your knowledge on this!

this information are just some of my experiments I have already published contributions on other channels on the internet, thanks to you.