HackRF One

Product Information

RF Filtering/Preselection - A high performance SDR will have multiple preselector filters that switch in depending on the frequency you are listening to. HotMobile'17: proceedings of the 18th International Workshop on Mobile Computing Systems and Applications: February 21-22, 2017, Sonoma, CA, USA. ACM SIGMOBILE, Association for Computing Machinery. New York, New York. 21 February 2017. ISBN 9781450349079. OCLC 981765641. {{ cite book}}: CS1 maint: location missing publisher ( link) CS1 maint: others ( link) First, I’m really impressed by the excellent simplification job done by Team RTL-SDR.com. Anyone with a basic setup can reproduce these tests and form his own opinion. The entire article is fluent and a is real reading pleasure. Also has unofficially developed ExtIO interface allowing it to work with any app supporting ExtIO. For example:

Images/Aliasing - Bad SDRs are more likely to overload and show images of strong signals at frequencies that they should not be at. This can be fixed with filtering or by using a higher dynamic range/higher bit receiver. The way the tests were performed in the article may be handy but far away from the precise because the readers are looking for the fraction of the dB. Such accuracy is difficult to get even in the lab sometimes not to mention problems using the external signals through the antenna where influence of the external factor may be significant and selective. Let say weak signal test where the QSB is present and even multiple reflections on the higher frequencies. I’d love to write some code for these someday! Most of the really top notch awesome stuff like EPC tags requires full duplex, but there’s still so much you can do here! Dynamic Range - This is directly related to ADC bit size, but is also affected by DSP software processing. Dynamic range is the ability of an SDR to receive weak signals when strong signals are nearby. The need for high dynamic range can be alleviated by using RF filtering. Overloading occurs when a strong signal starts to saturate the ADC because the dynamic range was not high enough.The USB B connector on the RSP is sturdy and does not easily come loose. It is also easier to find high quality shielded USB cables with USB B connectors. The SDRplay RSP can achieve a similar effect by reducing the bandwidth displayed, however this means that a lower sample rate is used, and thus less decimation occurs. In this review we will only consider RX performance. So first we will review some terminology, features and specifications that are required for a good RX SDR. For all destinations outside European Union, all shipments are DDU - Delivered Duty Unpaid. This means that your country's custom service impose a VAT/TVA/Import Duty on your shipment. I am charged VAT ? If you prefer to use the automatic gain control (AGC) then you can control the "setpoint" value which will try and keep the noise floor at the specified value.

SNR - When receiving a signal the main metric we want to measure is the "Signal to Noise" (SNR) ratio. This is the peak signal strength minus the noise floor strength. There is no option to set the PPM offset (the PPM box is for adjusting the Spyverter upconverter only) as the 0.5 PPM TCXO used on the Airspy should not need any offset adjustment. Airspy Controls SDRplay RSP CPLD bitstreams are now included in and loaded automatically by the firmware. There is no longer a need to update the CPLD separately.As the author of the post excuse himself in the diclaimer note, I will try to keep my comment short. Othervise this will be a long comment, even longer than the author post 🙂 This periodic signal contains a strong sinusoidal component spanning from -2 to 9. If you were to plot the spectrum of this signal, you would see one spike at the frequency of this sinusoid and a second spike at 0 Hz (DC). If the signal spanned from values -2 to 2 (centered around zero), there would be no DC offset. Since it is centered around 3.5 (the number midway between -2 and 9), there is a DC component.

Before starting the process of GPS spoofing, the following are the software and hardware components you must have: You can type startx at the command line to launch a desktop environment. Accept the “default config” in the first dialog box. The desktop environment is useful for GNU Radio Companion and other graphical applications but is not required for basic operations such as firmware updates.

The RF chain in the RSP goes Input -> Switch-> MGA-68563 LNA-> Switch -> Filter -> MSi001 -> MSi2500. Note that this is a very long review. If you don't want to read all of this very long post then just scroll down to the conclusions at the end. What makes a good SDR? Noise/Interference - Good SDRs should not receive anything without an antenna attached. If they receive signals without an antenna, then interfering signals may be entering directly through the circuit board, making it impossible to filter them out. Good SDRs will also cope well with things like USB interference.

Correct it. There are various ways of removing the DC offset in software. However, these techniques may degrade parts of the signal that are close to 0 Hz. It may look better, but that doesn’t necessarily mean that it is better from the standpoint of a demodulator algorithm, for example. Still, correcting the DC offset is often a good choice. Sensitivity - More sensitive radios will be able to hear weaker stations easier, and produce high SNR values. Step 3: Now, you need to generate your GPS-simulated "BIN" file for GPS spoofing, and for that, you need the coordinates of the location you want to simulate. Open a map app, find the location you want to spoof, and copy its coordinates. Leif has already done some of the hard number tests, although there are criticisms about his tests from SDRplay. It would be interesting if you or Leif could do some more hard number tests with your test equipment. The other hard number tests by other users that i’ve seen haven’t been done properly as far as I can see. For example all SINAD tests I have seen so far by testers with the right equipment did not set the SDR gain and sample rate settings correctly. If you don’t have the units i’m sure each company should be willing to provide you samples since you are well known in the SDR community.Minicircuits have quite strong PGA-103 advertising campaign what can be seen reading the various uW magazines. The technical note regarding the stabilization patch was upgraded several times. Driven by the fact that most of the buyers are probably not reading that papers they now include the patch in the datasheet too, at the very end of PDF file. Best results are from judicious use of the LNA slider and the internal amp. Did not use the VGA slider as am not sure of it's role in receiving. All three SDR's use a standard SMA connector. Previous versions of the RSP, like the unit we used in this review came with F-Type connectors. We don't like the F-type connector because it is less commonly used in the radio field and it has poorer RF insertion loss properties, so it is good to see that they changed the connector in the newer versions. There were no other changes to the RSP in the upgrade apart from the case and connector, so we believe this change should not significantly affect the review. We also note that the Airspy sends raw ADC samples to the PC and then must do the IQ conversion on the PC. In low IF mode the RSP does the same, but in Zero IF mode it sends IQ data. Physical Appearance and External Design These are ballpark figures merely arrived at by reading off the peak signal strength for the main signal and comparing it top the peak signal strength of the image as shown on the SDR#.