HackRF One

Product Information

Snooping in on satellites is getting to be quite popular, enough so that the number of people advancing the state of the art — not to mention the wealth of satellites transmitting signals in the clear — has almost made the hobby too easy. An SDR, a homebrew antenna, and some off-the-shelf software, and you too can see weather satellite images on your screen in real time. Well, so far initial results on HF are fine, need to do more monitoring on VHF/UHF to determine how well it works. 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. 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 🙂 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 ?

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. Good support for the Raspberry Pi 2, especially for ADS-B where they have developed an official 20MSPS ADS-B decoder which claims performance as good as or better than a dedicated Beast ADS-B receiver. Phase Noise - Phase noise performance is determined by the quality of the crystal oscillators used. Lower phase noise oscillators means better SNR for narrowband signals and less reciprocal mixing. Reciprocal mixing is when high phase noise causes a weak signal to be lost in the phase noise of a nearby strong signal. Adam describes the situation very well and believe me it is not a coincidence that a lot of preamps, e.g. for active ADS-B antennas that need a very low noise figure while having a great dynamic range magically are all being distributed with the same MMIC as the LNA4ALL and not the PGA-103+ which just looks much better on the paper. You can be sure that Adam would use the chip if it would be stable, since it is cheaper than the PSA4-5043+ and as mentioned offers less noise while having more dynamic range. THAT’S WHY I WENT TO RED PITAYA AND I’M NEVER LEAVING. At least THEY are developing apps –– and REALLY GOOD ONES AT THAT –– to support the Red Pitaya for a FULL UP HF TRANSCEIVER. My plan is to produce an upconverter for Red Pitaya that will allow it to transmit U/VHF, too, longer term.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.

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! 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. Several programs in code form on GitHub, but not many "plug and play" apps. Designed to be used more with software like GNU Radio. More importantly, the spectrum captured is not continuous, and [Oleg] questions whether it can be demodulated properly. He had to resort to frequency overlaps due to upsampling, and he’s not quite sure how to compensate for that. Overall frequency stability is also in question. However, from here, seems like most of the work towards building a wideband receiver is done!It seems that the design approach of the Airspy is to optimize for signal linearity and to avoid overloading through natural high dynamic range. I can offer the following figures for SDRPlay using API 1.8.1 which has in built I/Q balancing. Zero IF image rejection around 60 dB and low IF image rejection with 2.048 Mbps sample rate wasabout 40 dB – the image appearing 4.096 MHz below. This on the FM broadcast band – FM DXing is my main interest and images falling on a weak DX signal is the last thing that we want.

In conclusion it seems that the SDRplay tries to optimise itself for sensitivity by using a front end LNA, and focuses more on overcoming the effects of overloading via switched filter banks. Software defined radio talks from Defcon 23 - rtl-sdr.com". www.rtl-sdr.com. 5 December 2015 . Retrieved 2018-02-20.Native compatibility with SDR# on Windows. Also compatible with HDSDR, SDR-Console and GQRX on Linux. Good support for some other software that is most often used with the RTL-SDR: Frequency Stability - We should expect the receiver to stay on frequency and not drift when the temperature changes. To achieve this a TCXO or similar stable oscillator should be used. These are just very rough guesses and they could be wildly inaccurate. Note that these costs are for parts only, and they do not take into account manufacturing costs, engineering time costs and support staff overhead costs etc. Airspy 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. Software - The hardware is only half of an SDR. The software the unit is compatible with can make or break an SDRs usefulness.