HackRF One

Product Information

There is also the option to toggle on or off the internal Mirics chip LNA. This is the LNA in the tuner chip, and not the front end LNA which is always on for VHF+ frequencies. Turning this LNA on can help to reduce the noise floor, but also may cause additional imaging problems. Finally (well probably not) what appears to be an objective in-depth review based on the real world with its hugely complex mix of signals. However for me what is missing is the image rejection performance. In the case of the SDRPlay – the zero IF image rejection and the image rejection in low IF mode. In the case of the AirSpy the low IF image rejection.

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 🙂The RSP is designed with switching RF filters and an MGA-68563 LNA right at the front end which is only active for signals that are above 60 MHz. The MSi001 tuner chip has a second LNA inside it. The MGA-68563 is used as a preamp to overcome the losses in the filters and presumably to lower the noise figure of the internal MSi001 tuner LNA's. The MGA-68563 has a 1 dB noise figure, 19.7 dB gain and a 20 dBm OIP3. Urgent Express Delivery uses the fastest possible delivery method possible: UPS Express, FedEx Express, DHL Express or Chronopost Express.

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. The decimation feature allows you to reduce the visible bandwidth while at the same time increasing the visible SNR. This allows you to easily spot and tune into weaker signals. gps-sdr-sim -b 8 -e YOUR_BRDC_FILE TARGTED_LOCATION_COORDINATES" (BRDC file is the latest GPS broadcast ephemeris file, and coordinates refer to the location you want to simulate) In the LNA tests] the LNA [LNA4ALL] might not have enough dynamic range in a high performance setup since it overloads before the Airspy.Well, so far initial results on HF are fine, need to do more monitoring on VHF/UHF to determine how well it works.

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.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 The Airspy team suggested that the LNA should improve SNR on the Airspy, but that the LNA we used was not suitable for our environment due to it overloading on BCFM signals. They suggested that we should have used a LNA with a much higher dynamic range such as the PGA103+. 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. 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

Bandwidth - A larger bandwidth means more signals on the screen at once, and more software decimation (better SNR). The downside is that greater CPU power is needed for higher bandwidths. 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:The Airspy team write that they sell units mostly to universities, governments and professional RF users. However, they also have a sizable number of amateur users. 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.