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Dennis Mantz
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Final version 2.1 - Updated documentation
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‎Readme.md‎

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## Features
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- Real-time **FFT and waterfall display** with scroll and pinch-to-zoom
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- Supports **HackRF**, **RTL-SDR**, and **File Source** (files with raw IQ
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data)
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- Audio demodulation: **CW**, **AM**, **nFM**, **wFM**, **LSB**, **USB**
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- Record raw IQ data
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- Modern and dynamic UI with a bottom (or side) drawer for full control
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[![ko-fi](https://ko-fi.com/img/githubbutton_sm.svg)](https://ko-fi.com/T6T11M88LK)
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[![liberapay](https://liberapay.com/assets/widgets/donate.svg)](https://liberapay.com/DM4NTZ/donate)
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---
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## About the Author

‎app/build.gradle.kts‎

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applicationId = "com.mantz_it.rfanalyzer"
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minSdk = 28
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targetSdk = 36
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versionCode = 20104
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versionName = "2.1.0beta3"
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versionCode = 20106
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versionName = "2.1.0"
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testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
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}

‎app/src/main/java/com/mantz_it/rfanalyzer/database/BillingRepository.kt‎

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val installTimestamp = getInstallTimestamp(context)
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val installedDays = TimeUnit.MILLISECONDS.toDays(System.currentTimeMillis() - installTimestamp).toInt()
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val trialPeriod= 7 // 7-day trial period
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return if (installedDays > 60) // workaround for people who had the old app version installed already (prior to 2.0 launch)
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trialPeriod // these people just get 7 days and the usageTime is the limiting factor
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return if (installedDays > 120) // workaround for people who had the old app version installed already (prior to 2.0 launch)
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trialPeriod // these people just get 7 days and the usageTime is the limiting factor
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else
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(trialPeriod - installedDays).coerceAtLeast(0)
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}

‎docs/about.md‎

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RF Analyzer is an open source spectrum analyzer that lets you use you
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SDR hardware together with an Android device. A detailed description
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can be found in the [manual](https://github.com/demantz/RFAnalyzer/blob/master/doc/rf_analyzer_manual.md)
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can be found in the [manual](https://demantz.github.io/RFAnalyzer/index.html)
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Changelog: [changelog.txt](https://raw.githubusercontent.com/demantz/RFAnalyzer/master/changelog.txt)
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## About the author
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Hi! I’m DM4NTZ, a ham radio operator and open-source developer.
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I'm the creator and maintainer of RF Analyzer, an open-source software-defined
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radio (SDR) app for Android. The app lets you visualize and analyze RF signals
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in real time using SDR hardware such as RTL-SDR dongles.
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My goal is to make SDR technology more accessible, portable, and open for radio
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enthusiasts, experimenters, and learners.
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As a licensed amateur radio operator, I'm passionate about signal processing,
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wireless communication, and the broader SDR ecosystem. I also contribute to
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open-source projects, share knowledge with the ham radio community, and
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continuously improve my tools based on user feedback.
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If you like what I'm building or want to support the development of RF Analyzer
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and related open-source SDR tools, you can support me with one of the following
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options. Every contribution helps keep the project alive and open for everyone.
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- [Ko-fi](https://ko-fi.com/rfanalyzer)
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- [Liberapay](https://liberapay.com/DM4NTZ/donate)
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- [Paypal](https://paypal.me/dennismantz)
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How to reach me:
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- Amateur Radio Callsign: DM4NTZ
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- Mastodon: [@dm4ntz@chaos.social](https://chaos.social/@dm4ntz)
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- Mail: rfanalyzerapp -at- gmail -dot- com
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## Get Beta Releases
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If you want to help the developer by testing beta releases you can
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join the beta program on Google Play:
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If you want to help me by testing beta releases you can join the beta program
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on Google Play:
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[https://play.google.com/apps/testing/com.mantz_it.rfanalyzer](https://play.google.com/apps/testing/com.mantz_it.rfanalyzer)
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## Reporting Bugs
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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```
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### Airspy License
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RF Analyzer uses [libairspy](https://github.com/airspy/airspyone_host/tree/master/libairspy)
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```
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Copyright (c) 2012, Jared Boone <jared@sharebrained.com>
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Copyright (c) 2013, Michael Ossmann <mike@ossmann.com>
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Copyright (c) 2013-2016, Benjamin Vernoux <bvernoux@airspy.com>
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Copyright (C) 2013-2016, Youssef Touil <youssef@airspy.com>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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Neither the name of AirSpy nor the names of its contributors may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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```
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### HydraSDR License
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RF Analyzer uses [libhydrasdr](https://github.com/hydrasdr/rfone_host/tree/main/libhydrasdr)
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```
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Copyright (c) 2012, Jared Boone <jared@sharebrained.com>
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Copyright (c) 2013, Michael Ossmann <mike@ossmann.com>
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Copyright (C) 2013-2016, Youssef Touil <youssef@airspy.com>
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Copyright (c) 2013-2025, Benjamin Vernoux <bvernoux@hydrasdr.com>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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Neither the name of HydraSDR nor the names of its contributors may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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```
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‎docs/index.md‎

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## Features
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- Real-time FFT & waterfall spectrum visualization
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- Support for **HackRF, RTL-SDR, and IQ file playback**
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- Support for **HackRF, RTL-SDR, Airspy, HydraSDR and IQ file playback**
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- Analog signal demodulation (CW, AM, nFM, wFM, LSB, USB)
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- Adjustable SDR settings (frequency, gain, sample rate, etc.)
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- Adjustable FFT settings (FFT size, averaging, peak hold, frame rate, etc.)

‎docs/sdr-source.md‎

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- **RTL-SDR** - Receive live radio signals using an RTL-SDR USB dongle.
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- **HackRF** - Works similarly to RTL-SDR but supports wider bandwidths.
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- **Airspy** - A high quality SDR supporting 12bit resolution and up to 10MHz bandwidth.
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- **HydraSDR** - A high quality SDR supporting 12bit resolution and up to 10MHz bandwidth.
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- **File Source** - Replay a previously recorded IQ file.
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!!! note "Automatic Source Detection"

‎resources/playstore description.txt‎

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DESCRIPTION
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Analyze RF signals on Android with HackRF or RTL-SDR.
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Analyze RF signals on Android with HackRF, RTL-SDR, Airspy and HydraSDR.
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RF Analyzer turns your Android device into a real-time spectrum analyzer for
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Software Defined Radio (SDR). Visualize and listen to radio signals around you
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- from amateur radio to broadcast signals and beyond.
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RF Analyzer turns your Android device into a real-time spectrum analyzer for Software Defined Radio (SDR). Visualize and listen to radio signals around you - from amateur radio to broadcast signals and beyond.
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Whether you're a curious beginner or a seasoned ham, RF Analyzer offers a
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hands-on, interactive way to explore radio signals.
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Whether you're a curious beginner or a seasoned ham, RF Analyzer offers a hands-on, interactive way to explore radio signals.
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FEATURES
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- Works with HackRF, RTL-SDR, or pre-recorded IQ files
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- Works with HackRF, RTL-SDR, Airspy, HydraSDR or pre-recorded IQ files
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- View live spectrum (FFT) and waterfall plots
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- Demodulate AM, FM, SSB, and CW signals
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- Record raw IQ samples for offline analysis
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PRICING
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You can try all features for free with a 7-day trial and up to 60 minutes of
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analyzer usage.
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You can try all features for free with a 7-day trial and up to 60 minutes of analyzer usage.
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If you like it, a one-time in-app purchase unlocks the full version - no
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subscriptions, no accounts, no ads.
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If you like it, a one-time in-app purchase unlocks the full version - no subscriptions, no accounts, no ads.
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This app is a hobby project, built with passion and countless hours of work.
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Supporting the app helps me continue developing and improving it. Thank you! 🙏
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This app is a hobby project, built with passion and countless hours of work. Supporting the app helps me continue developing and improving it. Thank you! 🙏
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REQUIREMENTS
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- Android phone or tablet (with USB OTG support)
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- Supported SDR hardware (HackRF or RTL-SDR)
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- Supported SDR hardware (HackRF, RTL-SDR, Airspy or HydraSDR)
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- Note: The RTL-SDR Blog v4 is fully supported.
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- USB OTG adapter (USB-A female to USB-C for modern phones)
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- This is not necessary for SDRs with USB-C connector (e.g. the HydraSDR)
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LEARN MORE
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Want to go deeper? The full user manual is available with signal identification
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tips, ham radio basics, and more: https:// todo //
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Want to go deeper? The full user manual is available with signal identification tips, ham radio basics, and more: https://demantz.github.io/RFAnalyzer/
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Have fun exploring, learning, and listening to radio signals :)
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73!
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- Dennis (DM4NTZ), Heidelberg, Germany
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LICENSE
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This application is released under the GNU General Public License v2. It is
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free software and the source code is available on GitHub.
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This application is released under the GNU General Public License v2. It is free software and the source code is available on GitHub.
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LEGAL ISSUES
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Please note that I am not responsible for any legal issues caused by the usage
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of this application. Be responsible and comply with your local law!
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Please note that I am not responsible for any legal issues caused by the usage of this application. Be responsible and comply with your local law!

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