PLEASE READ THE ENTIRE DESCRIPTION BEFORE PURCHASING. iSDR is the first and only software-defined radio application compatible with the Apple iPhone®, iPod touch® and iPad™. iSDR is for experimenters and amateur radio enthusiasts looking to construct a truly portable software-defined radio receiver. Additional hardware is required to receive live signals. Currently, iOS devices will not work with RTL-SDR USB dongles, and they are not supported by iSDR.
PLEASE NOTE: Receiving live on-air signals using iSDR requires purchasing or constructing a "quadrature sampling detector (QSD)" RF front-end device, and connecting it between an antenna and the microphone input jack. Alternatively, iSDR can be used to implement a panadapter for use with a compatible radio receiver. Without a QSD RF front-end or a connected radio, iSDR will only play I/Q recordings of actual radio signals. Additional recordings can be loaded into the app using iTunes file sharing - some recordings are available free to download from the Internet. Visit the support web site for more information.
iSDR includes a sample I/Q recording featuring 30 seconds of a ham radio contest. This is for demonstration purposes only. It is not meant to fool you! It is to allow you to experience how the app works without having to do anything yourself: just turn it on. You can download and play your own files if you like. Please see the support page for details. AND PLEASE contact us directly if you experience any issues with using this app. We will respond promptly when provided with details.
When iSDR is used to receive live radio signals, receiver performance will depend largely on the quadrature sampling detector and antenna that you use.
iSDR is a software-defined receiver application for use on mobile handset devices and iPad. Despite its extreme portability, the app utilizes the same digital signal processing techniques found in PC-based SDR receivers. It does frequency domain filtering using a theoretical "brick wall" sinc filter algorithm to provide steep and deep bandpass filtering. iSDR doesn't utilize any DSP hardware but instead uses the iOS device's processor to implement DSP algorithms.
o Six receive mode settings: USB, LSB, CW, AM, FM* and Binaural.
o Selectable bandwidth settings for each mode.
o Signal strength meter covering 120 dB of dynamic range with peak and average power indication.
o Three AGC settings: fast, slow, and off.
o Three display modes: Spectrum, Waterfall and Oscilloscope.
o File sharing** supports downloaded audio-format spectrum files synced using iTunes.
o Most PCM file formats are supported, including .wav and .caf.
o Embed the center frequency in your file names and iSDR will automatically display the correct frequency!
o Tune quickly using a single touch to the display screen, or tune precisely using the rainbow tune bar.
o Change radio settings with a simple double-tap action to the red cursor, mode text, AGC indicator or signal grid!
o Up to 44.1 kHz of available spectrum bandwidth.
o Dimmable semi-log or linear spectrum grid (native Settings app only).
o Adjustable CW offset (native Settings app only).
o Monaural microphone input automatically adjusts the display to 22 kHz bandwidth.
o Automatically detects if external audio is available for receiving live signals (menu selectable).
o Reverse I/Q stereo input logic (menu selectable).
*FM mode is not supported for monaural signals, and will not appear as a mode selection unless stereo audio (live or recorded) is available. Narrowband FM only: 16 kHz or 11.2 kHz bandwidth.
Please contact Digital Confections with your questions and suggestions!
o Fixes a crash when using native Settings
o Provides WiFi functionality without in-app purchase
o Updates for iOS 9 and above
o Support for iPhone 11 and iPad Pro
Ratings and ReviewsSee All
This is a fantastic idea for an app, and I am glad it's freeware! Some points for improvement:
1. The user interface needs to be more user friendly. For instance, trying to lock the frequency at a certain point almost always ends up affecting/moving the reception slider bar instead.
2. There should be a recording function.
3. The sound should play even when the app is minimized.
4. There ought to be an official front end that can be purchased separately for this app. It should be pre-built, tested for use with idevices, and should include an antenna. A separate antenna with a ferrite rod should be optional for good AM reception.
Keep up the good work!
Panadapter for KX3
I bought this app to use as a Panadapter with my Elecraft KX3. For only 99 cents it's a real bargain. I connect the iPad to my radio through a Griffin iMic and the Apple camera connection kit. I use the tuning knob on the radio and watch the peaks on the spectrum display move left or right, depending on which direction I'm tuning. When a peak is at the center of the display, I hear that station coming out of my radio. The waterfall display is a lot harder to use this way, so I only use the spectrum display. I hope Digital Confections will add a dual spectrum/waterfall display like on Elecraft's panadapter. That's the only reason I didn't give the app 5 stars.
Great SDR file analyzer
If you don't understand what this is, don't download it and then make useless remarks in a review. It's not a receiver, not by itself anyway. While you could use it real time by routing the iq stream from an external receiver to the mic input I "feed it" prerecorded IQ files I generate from a digital receiver connected to a PC. This software provides portable, offline analysis and demodulation of signals within the recorded spectrum of the file. Pretty amazing feat give the limited horsepower in an iPad. 73 ab1jv
No Details Provided
The developer will be required to provide privacy details when they submit their next app update.
- Digital Confections LLC
- 38.1 MB
- Requires iOS 9.0 or later.
- Requires iPadOS 9.0 or later.
- iPod touch
- Requires iOS 9.0 or later.
- Requires macOS 11 or later and a Mac with Apple M1 chip.
- Age Rating
- © 2019 Digital Confections LLC
- In-App Purchases
- Wi-Fi Radio Control
With Family Sharing set up, up to six family members can use this app.