SDRplay Community Forum

Hello everybody,

I've been able to get my RSP2 to work with gnuradio (on Linux) to receive airband signals, but reception so far is very poor. In gnuradio's "waterfall display" I can clearly see a carrier at e.g. 121.2 MHz, but the quality of the received audio is usually very poor. Even when the carrier is 40 dB above the noise floor (which it often isn't) the audio level is still very low.

Now gnuradio has a gazillion building blocks, each with a slew of settings, so I'm sure I have a "sub-optimal" flow, but no matter what I try, at best I get pilots drowned in noise.

Does anybody here have any experience with receiving airband using gnuradio? Any pointers are greatly appreciated.

Thanks!

-Raymond.


PS: I'm using a simple 4-ft (120 cm) antenna, thinking that would do for the 118-138 MHz band.

Hi Raymond, it is my experience that in many areas giant FM station signals do exist and they can badly overload and / or desensitize the RSP receiver. Make sure you use the FM notch when on the airband and if this is not enough use an external filter to blot out the FM band completely.

Agreed.Using FM notch becomes the concern of utmost importance here,as it enhances the possibilty of sucess in project..Do the same and it should help u..Thanks