I made some software to control  Comtech 13cm Audio Video Tx and Rx modules.   The software communicates with the Comtech modules via a parallel to I2C converter based on a circuit designed by Philips.  The demodulator chip in the receiver has an AGC output which I hooked up to an unused analog input on the synthesizer.  It can only "measure" 6 levels but to make a panorama receiver which just show whether there is some activity in the band it is sufficient.  


Since I used this version for testing, the number of buttons is quite large.  All the synthesizer features can be controlled.  For normal use this is a bit overdone and one can get by with a stripped version.

After pressing the Panorama button the scan window opens, which looks like this: