3/29/2021 0 Comments Sdr Radio Reviews
The top three filters do an excellent job at blocking out the broadcast AM band.
![]() Radios with a natural high dynamic range design like the Airspy HF are less affected by this problem, but for the strongest of signals use of a preselector can still help. From measurements on a VNA, we found that the preselector features four bands of operation. Sdr Radio Reviews Install It YouTo install it you need to carefully solder it onto the HF PCB. This can be a little tricky since the pads are so small, but if youre experienced with soldering it shouldnt be an issue. It is expected that the commercially sold versions of the preselector will come with detailed installation instructions. Currently were considering making a breakout PCB for the filter than might aide with this. This is because the second, third and fourth filters all heavily attenuate the MW broadcast AM band, which is the main source of overload issues on HF. This reduction was enough to prevent overload on all the higher bands. The HF with the filter was routinely able to withstand much higher signal powers without any signs of overload occurring, and no degradation due to insertion loss was observed. ![]() Hes also made his HF with preselector available for public use via SpyServer (details in his post). In the video below Leif SM5BSZ reviews the preselector and runs through several tests while comparing it against the Perseus. His results seem to show that the Persues gets a 25 dBm IP3, whilst the HF with the latest firmware and preselector is able to obtain a respectable 10 dBm IP3. Of course the preselector cannot help if you have strong signals within the filter bands. Just take note that youll need to open the HF and be comfortable with soldering onto the PCB.
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