As far as I can see my version only supports the serial command method. Still, any kind of S11 measurement will show much worse results than in real life for low-level signals since it will overdrive the RF front end of the receiver.Īccording to this post, some versions allow you to set the signal level from the user interface or by using serial commands. The E4000 tuner in an rtl-sdr has a absolute maximum RF input level of 10 dBm, so strictly speaking it will probably survive. For example, it will likely damage a HackRF if you tried to measure the return loss of its antenna input. Much higher than what is stated in the manual. ![]() The measured RMS voltage is 326 mV, which is around 3.3 dBm at 50 Ω. CH0 on NanoVNA was connected to a 50 Ω terminated input on the scope. This is how the output signal of a NanoVNA-H I have (firmware version 0.4.5-1-gfbbceca, PCB revision v3.4) looks on an oscilloscope. ![]() It's always good to double check these things. However there seem to be a lot of different NanoVNA variants floating around, differing in both hardware and software. I've seen posts also specifically claim that NanoVNA is suitable for measuring active components because of the low signal level at which it performs measurements: ![]() When searching the web for the stimulus signal level that is present on port CH0 of NanoVNA, most results seem to refer to the RF output figure given in the User Guide: between -13 and -9 dBm.
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