I am building a groundstation to detect signals from cubesats or other signals in 420 - 450 MHz, but I do not see any signals.
I make a helical antenna with 10 dBi and I use a USRP to control the SDR. In the first part of detections, I need to see only the temporary signals on spectrum analyzer, due to the Cubesats pass for 10 minutes. But I can't see.
I tested the antenna, sending a carrier through the signal generator and it is OK. The USRP has a sensitivity of -110 dBm, using its amplifiers. Besides that I bought two LNAs with 20 and 24 dB of gain, ans it is not enough.
What I need to do more?
Regards and thank you for this great project!!
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