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How to measure the Lora modulation sensitivity under -120 dBm with N9020A

Question asked by william_woo on Nov 9, 2017
Latest reply on Nov 12, 2017 by william_woo

Hi all

I have a question about the measurement of Lora modulation for RX.

Because the sensitivity is close to the noise floor.

So I have tried the internal amp with RBW 1KHz in N9020A in average power mode.

The display shows like below.

Is there any optimize way to have better measurement?

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Outcomes

Hi William,

I have good experiences with the Keysight U7227A external preamplifier (10MHz to 4GHz, Gain 20dB, NF ca. 3.5dB@1Ghz).

Its calibrated and the software automatically takes the gain into account without any manual data entry.

This should easily suffice for -120dBm signals when you keep the BW low enough.

I have made a lot of low-level measurements (noise sources) using this and even homebrew parts and they work fine.

If you are interested, you may check the link below:

or this one

regards

Wolfgang

Hi Wolfgang

Thanks for your suggestion.

I will consider the preamplifier as an option.

However I still wonder if I could use the SA only in this criteria.

regards

William wu