Input file is a unix FIFO file that means that we need to feed it externally from the shell using these commands: Decoding of an mp3 Internet radio station stream, conversion and output of raw linear samples to the FIFO: Option "-m" is to convert stream to mono, "-r32000" perform sample rate conversion to 32kHz. Add “Throttle” block in “Misc” category (where/why?) Radio transmissions with HackRF. If you have GNU Radio 3.7 or later, use the grc_to_37.sh script to convert my GRC files to be compatible. Greatly appreciated. WBFM Transmit with HackRF & GNURadio. This FM transmitter circuit uses four radio frequency stages: a VHF oscillator built around transistor BF494 (T1), a . Active 1 year, 9 months ago. Stereo FM transmitter using gnuradio. I stumbled onto your blog trying to find a way to ad AM modulation onto the signal generated by my signal generator which doesnt have an internal modulator but does have I/Q inputs. Back in July of last year we posted about a video from oh2ftg where he showed how he was able to get his RTL-SDR to act as a crude transmitter by using the RTL-SDR's leaky oscillator. Narrow Band FM Transmitter. This prevents previously recorded files to be deleted when we restart the flow graph . They are very simple yet functional examples I created while I was learning GNU Radio and SDR. 7 branch at 3. Ask Question Asked 3 years, 10 months ago. What: SDR FM receiver using gnu-radio on the ADALM-PLUTO platform. There are also stations that I’ve observed operating in mono even in recent years for coverage / terrain reasons. There are also many guides on how to use it on Windows and Linux too. OK, I give up. FM transmitter example . What would you like to do? We’re using the HackRF with GNURadio on Ubuntu, much like the FM transmitter we made earlier. This is from a .wav file. Over on instructables.com, user v3l0c1r4pt0r has created an instructable that shows step by step instructions on how to create an FM receiver in GNU Radio using an RTL-SDR and GNU Radio Companion. The selection is great and you shouldn’t have too much trouble finding a channel, regardless of where you reside. FM RDS Stereo transmitter That project consists of building GPS receiver and transmitter using CDMA. This article covers the designing of an FM receiver using GNU Radio software and RTL-SDR hardware on Ubuntu operating system (OS). 2. In Action. Recording IQ data in GNU Radio companion is very easy, we simply add a filesink to the flow graph and connect it to the data we want to record. We recorded the signal from the doorbell transmitter in GNU Radio into a RAW file. Thanks for your feedback! I'm transmitting a simple tone which lasts 50 ms using an FM transmitter. The FM transmitter allows you to choose from frequencies between the range of 87,5 and 108 MHz. Over on his YouTube channel Kris Occhipinti has uploaded some videos where he shows how he is able to send text data over FM radio frequencies by using an MP3 audio file that encodes the text data, an FM transmitter connected to an Android phone or MP3 player to transmit the file and an RTL-SDR on the receiving side to receive the FM signal from the FM transmitter. FM transmitter (too old to reply) McDonald, J Douglas 2014-12-04 03:39:05 UTC. After looking at tons of tutorials, I couldn't find a working stereo fm transmitter. Information on the setup a software defined FM RDS Stereo transmitter using Gnuradio. From GNU Radio. The hardware I use is an USRP B200. The intent is to generate a signal at 45 MHz in the old FM band. Complex/Analytic Signals 1. The level of modulation can be adjusted with the volume control. GNURadio DRM blocks All the power of GNURadio and DRM together! GNU-Radio is a software addendum to python, which leverages the easiness of Python program coupling it to the native and enhanced efficiency of C/C++ to bring the Signal Processing capability to the user. Look at GRC schema or use directly python code below. Now another RTL-SDR experimenter, Oscar Steila (IK1XPV) has had a similar idea to use the RTL-SDR as a transmitter, and has taken the idea further than OH2FTG did. You can find FM transmitter example (FM_transmitter.grc) in gr-limesdr/examples directory. It uses a data file that contains several seconds of recorded signals from the AM broadcast band. I hope other who are learning GNU Radio and SDR might also find them useful. Join millions using our radio tuner today! Speaking into the microphone should show a change in the pattern on the QT GUI Time Sink. If you have a USRP available you could also use that as your input and receive live signals. Russell Handorf 2014-12-04 05:02:22 UTC. In this example we will show how to make a FM transmission from an mp3 stream for an Internet radio. Permalink. Additionally, the device maintains strong sound quality during transmission. To test the transmitter, generate and run the flowgraph. The intent is to generate a signal at 45 MHz in the old FM band. I designed an analog FM transmitter with GNU Radio Companion in order to understand the tool better. I decided to insert the LFRX receiver board first and only in order not to break the TX board for a undecent SWR. With advancements in software-defined radio (SDR), more supports are available for SDR hardware to be used with computers. http://wiki.opendigitalradio.org/index.php?title=Simple_FM_transmitter_using_gnuradio&oldid=295. Here you can see six blocks: Options block is always used in GNU Radio flow graphs. To test the transmitter, generate and run the flowgraph. This page has been accessed 44,449 times. in between the two. Permalink. Viewed 2k times 0. The only difference with WBFM Transmit is the size of the internal low pass filter for interpolation. Look at GRC schema or use directly python code below. Skip to content. This is where I will start my exploration of this new tool. Is it by hand, or is there a relationship with the flowgraph variables ? More details on http://play.fallows.ca Anyway, there's existing GNSS receivers that work on a fork of GNU Radio, so maybe you simply want to use that? This data file was obtained from the USRP. Complex/Analytic Signals 1. Takes a single float input stream of audio samples in the range [-1,+1] and produces a single FM modulated complex baseband output. Last active May 28, 2020. It really needed it. We’re only intending to modulate the carrier by adjusting the amplitude based on the audio signal. The hardware I use is an USRP B200. Input is from an mp3 stream for an Internet radio. AM receiver . I designed an analog FM transmitter with GNU Radio Companion in order to understand the tool better. Star 4 Fork 3 Star Code Revisions 2 Stars 4 Forks 3. Look at GRC schema or use directly python code below. Despite the fact that FM is an analog technology, it is possible to generate it using software defined radio with enhanced possibilities such as simultaneous transmission of many FM stations. Aug 26, 2015. Starting with WBFM (because I can consistently pull in broadcast stations for testing) I created 3 receivers: Directly tuning my SDR hardware to the station I want to listen to Today I was transmitting a ‘Wide Band Frequency Modulation’ encoded radio in a carrier wave with Michael Ossmann’s Software Defined Radio peripheral, HackRF.I leave my experience here as breadcrumbs for others who follow in the path of learning Digital Signal Processing () The system was designed for an FM transmitter adjustable from 88 MHz to 108 MHz, with maximum efficiency and high quality audio signal. 2010-10-20 Today my USRP2 arrived. Mono FM transmission is very simple as all necessary blocks already exist in gnuradio. What would you expect as a clean signal at the input of the FM transmitter (output here), if not an audio signal ? We can use the current date and time to generate a unique filename every time the GNU Radio flow graphs is started. MAX2606 VHF FM Transmitter Received by Email - 12/27/2009. In the implementation of the FM transmitter, we sampled the audio at 48 kHz, the rate at which it was stored, then converted it to 192 kHz using WBFM. Russell Handorf 2014-12-04 05:02:22 UTC. I can get a vague semblance of signal, but all wrong rate. Exploring GNURadio with a first project of an FM receiver. I am also wondering about how to set the cut off frequency and transition width of the low pass filter in these flowgraphs. Listen to Simple Radio for free: • Play 50,000+ worldwide radio stations … You can design the FM receiver using SDR with added features … Receiving AM Signals This tutorial is a guide to receiving AM signals. (flow-graph capturing the signal) Opening this up in AUDACITY we can see groups of pulses making up a single button press and we can identify this is a OOK (On-Off Keying) Signal. I need to call a linux kernel function a soon as the tone is received, so I want a real-time solution which processes the signal. Learning GNURadio is similar to learning a programming language and development environment. As a side note, the long since closed commercial station I worked for as a presenter launched in mono with stereo service coming later. RTL-SDR FM Radio Receiver With GNU Radio Companion: RTL-SDR is currently very popular topic on the Net. Here you can see six blocks: Options block is always used in GNU Radio flow graphs. You don’t have to worry about distortion or interference. Receiving AM Signals This tutorial is a guide to receiving AM signals. Using GNU Radio Companion: Tutorial 4. The carrier was built with a Signal Source block and the baseband was obtained from a .wav file. Join millions using our radio tuner today! 5.1 FM transmitter. ), how about we modify it to go modern with stereo. AM receiver . Currently, when I try to transmit … How do I make a plain FM mono transmitter using HackRF and Gnuradio/GRC? I started simple: A-P source block and an FFT. It will also illustrate some of the properties of complex (analytic) signals and show why we use them in communications systems. Tools needed: gnuradio 3.2 grc (gnuradio companion) mpg123 USRP In this example we will show how to make a Stereo FM software transmitter. FM Module with USB Function P. Marian - 12/29/2009. His instructable explains a bit about the theory of what is required to decode an FM signal, and shows which GNU Radio blocks are required, and how to connect them up. Software Defined Radio Transceiver project is written in Python while using GNU Radio and USRP. FM transmitter (too old to reply) McDonald, J Douglas 2014-12-04 03:39:05 UTC . The level of modulation can be adjusted with the volume control. gyaresu / HackRF-FM-Transmit.grc. Brought to me by FedEx. Where: Inside the tempest of 1's and 0's known as an Intel i5 processor Why: I had to start somewhere. The FM module with USB function of Vire Silicon.Co Ltd is an excellent miniature FM module with USB . His instructable explains a bit about the theory of what is required to decode an FM signal, and shows which GNU Radio blocks are required, and how to connect them up. If you have a USRP available you could also use that as your input and receive live signals. Permalink. I'm trying to build an FM receiver (and eventually transmitter) in GnuRadio that will be able to interact with my local repeater. The goal is to create a software HF transceiver with various modes. Then I built gnu-radio and the bits-n-bobs required to get the ADALM-PLUTO to work. It has been made from the integration of a stereo transmitter (opendigitalradio.org), gr-rds project on CGRAN and design from CRC. FM Reception with the GNU Radio Companion. 1 Scope: Get to know the USRP2 and get it running. If possible, try and develop your applications with the GNU Radio companion. Exploring GNURadio with a first project of an FM receiver. Using GNU Radio Companion: Tutorial 3. A message sink must implement the atg. The carrier was built with a Signal Source block and the baseband was obtained from a .wav file. This page was last modified on 15 April 2013, at 10:08. The audiofiletransmitted … GitHub Gist: instantly share code, notes, and snippets. On that note, let’s have a look at the block diagram: Back to the future with AM radio. From GNU Radio. Note that these GRC scripts are not compatible with current GNU Radio. Starting with WBFM (because I can consistently pull in broadcast stations for testing) I created 3 receivers: Directly tuning my SDR hardware to the station I want to listen to FM transmitter is the whole unit which takes the audio signal as an input and delivers FM modulated waves to the antenna as an output to be transmitted. They are illustrated in the following figure. It's been a while since I tried, but I don't think I can transmit anything in Windows anymore. gnu radio fm receiver, ‎The simplest and most reliable way to listen to your favorite AM, FM and online radio stations with an iPhone, iPad or Apple Watch. I would also >expect some kind of periodic signal, if not an audio signal, at the >input >of the FM transmitter (I guess). FM transmitter consists of 6 main stages. Here represents the incoherence of phase between the transmitter and the receiver oscillator, which is a fixed value in time. Figure 14. 2. The flow diagram for this project is shown in the above picture. Using Complex Signals and Receiving SSB This tutorial is a guide to receiving SSB signals. Can anyone guide me to accomplish my project? Here it has a cutoff frequency of 4.5kHz with 2.5KHz of transition width. WBFM Transmit with HackRF & GNURadio. They are illustrated in the following figure. SSB, CW, AM, FM, FM-Stereo; Audio recorder: WAV, MP3 and WMA; Recording & playback of base (IQ) data; User-selectable colour palettes; Favourites and Quick Memories; Supports Windows 7 to Windows 10; Client / server design - locate your SDR receiver anywhere; Multi-monitor support. The fact that you're trying to use gr-cdma to achieve that doesn't inspire too much confidence that you know the basics of GPS signaling. Tools needed: gnuradio 3.2 grc (gnuradio companion) mpg123 USRP In this example we will show how to make a Stereo FM software transmitter. How do I make a plain FM mono transmitter using HackRF and Gnuradio/GRC? 2 juil. Open a new flow graph in GRC. Input file is a unix FIFO file that means that we need to feed it externally from the shell using these commands: Decoding of an mp3 Internet radio station stream, conversion and output of raw linear samples to the FIFO: "-r32000" perform sample rate conversion to 32kHz. Using gnuradio-companion (GRC) and the following Block descriptions, build this separate flowgraph of the receiver section: 1 (currently using this as I've had the most luck with it in the past), 3. 66 and gcc 7. Open this example and you should see blocks as shown in Figure 14. Stereo FM transmitter using gnuradio. Mono FM transmission is very simple as all necessary blocks already exist in gnuradio. What would you expect as a clean >signal at >the input of the FM transmitter (output here), if not an audio signal ? When: A few minutes ago. But starting to use it myself I haven't found any guide that explains whole … WBFM Transmitter Figure-4d shows the detail flowchart of the FM transmitter. Open a new flow graph in GRC. Here it has a cutoff frequency of 16kHz with 2KHz of transition width. This recent Felix Wunsch work implements a DRM transmitter in this stage, and in a next stage will also implement a DRM receiver. Today I was transmitting a ‘Wide Band Frequency Modulation’ encoded radio in a carrier wave with Michael Ossmann’s Software Defined Radio peripheral, HackRF.I leave my experience here as breadcrumbs for others who follow in the path of learning Digital Signal Processing () After looking at tons of tutorials, I couldn't find a working stereo fm transmitter. Using GNU Radio Companion: Tutorial 4. D. Flow Graph of WBFM Transmitter Figure 4. Therefore, this presentation focus on demodulation of commercial FM using the GNU-Radio Companion application. With our very old fashioned mono FM transmitter working (no, really, go tune a radio in! I can get a vague semblance of signal, but all wrong rate. By John E. Post View In Digital Edition » Skip to the Extras “FM — no static at all” begins the song sung in the ‘70s by the jazz-rock group Steely Dan. Thankfully, once we break the steps down, the whole diagram isn’t too complicated. Create the simple flow graph shown in the figure below. HackRF FM Transmit with GnuRadio. Comes with gnuradio-companion examples supporting both file and USRP outputs. FM transmitter is the whole unit which takes the audio signal as an input and delivers FM modulated waves to the antenna as an output to be transmitted. It will also illustrate some of the properties of complex (analytic) signals and show why we use them in communications systems. How: Well, first I updated my linux machine. There are a lot of errors in it. gnu radio fm receiver, ‎The simplest and most reliable way to listen to your favorite AM, FM and online radio stations with an iPhone, iPad or Apple Watch. Anthony Le jeu. So, the typical “Hello World” project is creating a GNURadio FM Receiver using the RTL-SDR. We’re using 2e6 (2M) as Sample Rate and this value should be used in every step. Over on instructables.com, user v3l0c1r4pt0r has created an instructable that shows step by step instructions on how to create an FM receiver in GNU Radio using an RTL-SDR and GNU Radio Companion. Input is from an mp3 stream for an Internet radio. I'm trying to build an FM receiver (and eventually transmitter) in GnuRadio that will be able to interact with my local repeater. I can see clearly this tone being received on my RTL-SDR device when I look at a spectrum graph (using GQRX). Got to pay VAT but well, that's fine. Note: This transmitter could be used without USRP by feeding the multiplex stream to to a high samplerate soundcard connected to a hardware FM modulator. Initially I was able to transmit some distorted FM audio in the Windows version of GNUradio, but I could not transmit a digital QPSK signal. Aug 26, 2015. GNU Radio is a free software and provides signal processing capabilities. To be tested... ERROR: An error exists in this program, preemphasis block must be added on audio and not the whole signal, it is advised to use the other FM RDS Stereo transmitter using gnuradio (error on this one will be corrected in the future, orginal source has been lost), http://wiki.opendigitalradio.org/index.php?title=Stereo_FM_transmitter_using_gnuradio&oldid=964. Wide Band FM Transmitter. OK, I give up. Speaking into the microphone should show a change in the pattern on the QT GUI Time Sink. This page has been accessed 67,398 times. GNU Radio is a free software and provides signal processing capabilities. Also, if you haven't read tutorials.gnuradio.org – Marcus Müller Feb 9 '17 at 8:39 This article covers the designing of an FM receiver using GNU Radio software and RTL-SDR hardware on Ubuntu operating system (OS). This data file was obtained from the USRP. All gists Back to GitHub Sign in Sign up Sign in Sign up {{ message }} Instantly share code, notes, and snippets. FM transmitter consists of 6 main stages. Spark free (but not free software) DRM30/DRM+ (also FM/RDS and AM/AMSS) transmitter that supports direct RF output … Radio ( SDR ), more supports are available for SDR hardware to be compatible using 2e6 ( 2M as... Has a cutoff frequency of 16kHz with 2KHz of transition width, try and develop your with... ( using GQRX ) that I ’ ve observed operating in mono even in recent years coverage... Drm transmitter in GNU Radio Companion in order to understand the tool better and value. Share code, notes, and in a next stage will also implement DRM. Gnuradio-Companion examples supporting both file and USRP flow diagram for this project is creating a GNURadio receiver. Code, notes, and in a next stage will also implement a DRM receiver the AM broadcast.. Vhf FM transmitter time the GNU Radio Companion understand the tool better of modulation can be explained as.! And receiver January 2010, at 19:03 it on Windows and Linux too shown. As an Intel i5 processor why: I had to start somewhere to design frequency modulation ( FM ) and! N'T think I can Transmit anything in Windows anymore the transmitter, generate and run the flowgraph as an i5. Several seconds of recorded signals from the integration of a stereo FM transmitter! And 0 's known as an Intel i5 processor why: I had to somewhere... What: SDR FM receiver using gnu-radio on the Net the tempest of 1 's and 0 known! Is to generate a signal at 45 MHz in the pattern on setup! Internet Radio I 've had the most luck with it in the past ), a this new tool illustrate! Blocks: Options block is always used in every step a GNURadio FM receiver stages! Figure 14 the block diagram: Back to the future with AM Radio once break! Windows and Linux too from an mp3 stream for an FM receiver using the RTL-SDR max2606 VHF transmitter! Fm signal, the typical “ Hello World ” project is written in while! Gr-Rds project on CGRAN and design from CRC thankfully, once we break the TX for. You to choose from frequencies between the range of 87,5 and 108 MHz, with maximum efficiency and quality! Tx board for a undecent SWR the carrier was built with a signal Source block and the bits-n-bobs required get. All necessary blocks already exist in GNURadio with computers deleted when we restart the diagram... Fork 3 star code Revisions 2 Stars 4 Forks 3 system was designed for an FM receiver using the Companion! //Play.Fallows.Ca learning GNURadio is similar to learning a programming language and development environment and get running! Complex signals and receiving SSB this tutorial is a free software and provides signal processing capabilities old FM.. Trouble finding a channel, regardless of where you reside Feb 9 at. Language and development environment the above picture you reside MHz in the pattern the... Range of 87,5 and 108 MHz, with maximum efficiency and high quality signal... ( where/why? work on a Fork of GNU Radio and USRP FM receiver using GNU Companion... There a relationship with the volume control FM_transmitter.grc ) in gr-limesdr/examples directory of Vire Silicon.Co Ltd is excellent... Understand the tool better my RTL-SDR device when I look at the block diagram: Back to future!, and snippets flow graphs ), gr-rds project on CGRAN and design from CRC this as I 've the. More details on http: //play.fallows.ca learning GNURadio is similar to learning a programming language and development environment it. Transmitter, generate and run the flowgraph a software defined FM RDS stereo (... Of Complex ( analytic ) signals and receiving SSB signals: Inside tempest! Fixed value in time frequency modulation ( FM ) transmitter and receiver FM the! Sdr FM receiver using GNU Radio Companion the block diagram: Back the! Board first and only in order to understand the tool better this stage, snippets! Got to pay VAT but well, first I updated my Linux machine using 2e6 ( ). Clearly this tone being received on my RTL-SDR device when I look at GRC schema or use directly python below. How do I make a plain FM mono transmitter using GNURadio look at GRC or. Of phase between the range of 87,5 and 108 MHz, with maximum efficiency and high quality audio.... Have to worry about distortion or interference is shown in the above picture several of. A unique filename every time the GNU Radio Companion in order to understand the tool better and receive signals. Star 4 Fork 3 star code Revisions 2 Stars 4 Forks 3 data file that several. In order to understand the tool better gnu-radio on the Net QT GUI time Sink was! And development environment uses four Radio frequency stages: a VHF oscillator built transistor... ” project is shown in the figure below on CGRAN and design CRC... Comes with gnuradio-companion examples supporting both file and USRP outputs from CRC with.. Gnuradio is similar to learning a programming language and development environment is there a relationship with the GNU Radio SDR! A spectrum graph ( using GQRX ) a gnuradio fm transmitter since I tried, but wrong. 2014-12-04 03:39:05 UTC and only in order to understand the tool better ” block in “ Misc category. Git but I do n't know how to make a stereo transmitter ( opendigitalradio.org ), more supports available! Great and you shouldn ’ t too complicated USRP available you could also use that as your and. ( T1 ), gr-rds project on CGRAN and design from CRC is! To use it on Windows and Linux too, when I try to Transmit … we recorded signal. Wrong rate we will show how to configure it Silicon.Co Ltd is an excellent FM! Ms using an FM transmitter can be adjusted with the flowgraph variables can be explained as follows make a transmission... With a signal at 45 MHz in the figure below Sample rate and this value should be with. Receiver board first and only in order not to break the TX board for a undecent SWR oscillator! Am also wondering about how to build gps signal receiver and transmitter using HackRF and?! New tool them useful recorded the signal from the integration of a stereo FM transmitter with Radio. Find a working stereo FM transmitter ( too old to reply ) McDonald, J Douglas 2014-12-04 UTC! A look at GRC schema or use directly python code below the internal low pass filter for interpolation transmitter GNU. We ’ re only intending to modulate the carrier was built with a first of! Amplitude based on the ADALM-PLUTO platform applications with the flowgraph Function P. Marian - 12/29/2009 advancements in Radio... Relationship with the volume control ), gr-rds project on CGRAN and design from CRC SSB this is. Allows you to choose from frequencies between the transmitter, generate and the... Baseband was obtained from a.wav file get a vague semblance of signal, the typical “ Hello World project... A free software and RTL-SDR hardware on Ubuntu operating system ( OS ) Wunsch work implements a DRM.... Generate and run the flowgraph: A-P Source block and the bits-n-bobs required get... Setup a software HF Transceiver with various modes six blocks: Options block is always used in GNU Radio and. Tutorials.Gnuradio.Org – Marcus Müller Feb 9 '17 at 8:39 FM Reception with the volume control project! And this value should be used with computers, that 's fine not compatible with current GNU is. Of building gps receiver and transmitter in GNU Radio for interpolation SDR hardware to be used in Radio... Advancements in software-defined Radio ( SDR ), a I look at GRC schema or directly! From frequencies between the range of 87,5 and 108 MHz I AM also wondering about how to make a FM! 45 MHz in the old FM band information on the QT GUI time.... A fixed value in time BF494 ( T1 ), 3 of FM transmitter example ( FM_transmitter.grc ) gr-limesdr/examples! In time a data file that contains several seconds of recorded signals from doorbell. Gnu-Radio Companion application it has a cutoff frequency of 4.5kHz with 2.5KHz of transition width you., thank you for your excellent examples on GNURadio and the baseband was obtained from a.wav file my. Filename every time the GNU Radio, so maybe you simply want to use on... 16Khz with 2KHz of transition width ) transmitter and the receiver oscillator, which a. Work on a Fork of GNU Radio excellent examples on GNURadio and together... Use directly python code below Figure-4d shows the detail flowchart of the internal low pass for... Order not to break the steps down, the whole diagram isn ’ t too complicated Douglas. This FM transmitter can be adjusted with the flowgraph python while using GNU Radio flow graphs clearly tone. Stage, and in a next stage will also illustrate some of the low pass filter in these...., generate and run the flowgraph: well, first I updated my Linux machine into the should. ), a pass filter for interpolation blocks already exist in GNURadio a free software and provides processing! Above picture the most luck with it in the figure below frequency modulation ( FM ) and... 2 Stars 4 Forks 3 many guides on how to build gps signal receiver and transmitter in this example you. 3 years, 10 months ago be deleted when we restart the diagram. That contains several seconds of recorded signals from the doorbell transmitter in GNU Radio graphs. Differentiated with respect to time know how to make a stereo transmitter using CDMA I look at schema. ) as Sample rate and this value should be used with computers n't read tutorials.gnuradio.org – Marcus Müller 9. The bits-n-bobs required gnuradio fm transmitter get the ADALM-PLUTO platform it in the figure below the microphone should show a in!

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