![]() Sensitivity - More sensitive radios will be able to hear weaker stations easier, and produce high SNR values.ĪDC - Analogue to digital converter. The alias free bandwidth is the actual usable bandwidth and is usually smaller than the advertised bandwidth. The downside is that greater CPU power is needed for higher bandwidths.Īlias Free Bandwidth - The bandwidth on SDR displays tends to roll off at the edges, and also display aliased or images of other signals. This is the peak signal strength minus the noise floor strength.īandwidth - A larger bandwidth means more signals on the screen at once, and more software decimation (better SNR). SNR - When receiving a signal the main metric we want to measure is the "Signal to Noise" (SNR) ratio. So first we will review some terminology, features and specifications that are required for a good RX SDR. In this review we will only consider RX performance. If you don't want to read all of this very long post then just scroll down to the conclusions at the end. In this post we will review the Airspy, review the SDRplay RSP and review the HackRF and compare them against each other on various tests. These three are all in the price range of $150 to $300 USD. When people consider upgrading from the RTL-SDR, there are three mid priced software defined radios that come to most peoples minds: The Airspy ( store), the SDRplay RSP ( store) and the HackRF ( store). However, our preference is the Airspy HF+ Discovery for HF signals, and the SDRplay RSP1A for generic wideband wide frequency range receiving. Overall it is now difficult to pick a winner between Airspy and SDRplay products. IMPORTANT NOTE: Please note that this review is now out of date as the SDRplay RSP line has received significant improvements to their hardware and Airspy have brought out a new SDR that is much better at HF. ExtIO with Decimation & Tuner Bandwidth ControlsįebruReview: Airspy vs.Manual gain controls and decimation driver.Measuring Traffic Volumes with Passive Radar.SignalsEverywhere Direction Finding Tutorial.Measuring Filter Characteristics & VSWR.Performing Replay Attacks with RTL-SDR and RpiTX.QRP (FT8, JT9, WSPR etc) Monitoring Station.Decoding 433 MHz ISM Band Weather Stations.GOES 16/17 and GK-2A Weather Satellite Tutorial.The interactions that could happen with this are neat to think about. Imaging having slides now with problems to work, complete with graphs or whatever and setting your iPad in front of a student saying “Solve this problem”. There are arrows to take you forward and back on your slides and while you lose your transitions you have gained the ability to draw on the presentation and move freely around the room. Now in AirSketch I get the url to pull up on the classroom computer and I’m ready to go. On my iPad I opened my Dropbox App, opened the PDF file, and then clicked the icon in the upper right corner to choose “Open in AirSketch”. Then I put the PDF file into my Dropbox folder on my computer. I took a Powerpoint file and printed it to PDF format (on a Mac you print to PDF, on windows with Powerpoint 2007 or newer you can Save to other formats and pick pdf if you have the free plug in from microsoft). Now with the inclusion of PDF files you can present a powerpoint wirelessly in class. This was great before but somewhat limited as you could only write in a blank screen or pull up images from your library to write on top of. AirSketch now includes the ability to open PDF files!!! For those of you who don’t know what AirSketch is, it allows you to transmit whatever you draw on your iPad screen to a web browser, and of course that web browser could be the instructor computer in a classroom being projected to students. While I don’t always read the release notes for updates I’m glad I did with this one. One on the list for an update was AirSketch. I noticed this evening that my App Store icon showed a few updates were available and took a look.
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