Marat - thanks again for providing this very nice tool to observe radio spectrum. I'm always surprised by people who have no real idea of what's going on in the frequency domain, especially when there are apps like this.

 

What the OP suggested, having a peak/average holding spectrum display, would be pretty sweet.

 

While this thread is going, I'll chime in that it'd be nice to have a feature to speed up and slow down the vertical time display. Right now it seems to be about 70 seconds top to bottom, I am monitoring our local 70 cm LoRa network, and the digipeaters are really fast, so a single frame could get digipeated several times in 1 second. Some of the blobs below are actually multiple LoRa transmissions closely spaced in time. (Most of the frames below are saturating the SDR receiver due to the antennas being only 2 m apart.)

 

As well, I'd like to see the WFM mode be adjustable in bandwidth. I am monitoring some LoRa signals (a form of FM). I don't listen to broadcast FM radio, instead I use the WFM mode to "hear" the  LoRa frames and symbols (it's an easy way to translate a very wide-band signal into something that a human can hear). Being able to adjust the bandwidth to fit the LoRa bandwidth will help with the signal to noise ratio my ear hears. 

 

Cheers and 73 - Jon N7UV