I played with fast hopping a while ago and it works very well and you get lock times of less than 1 msec easily.
This is a B210 just quickly switching between 100M (FM), 816M (LTE), 940M (GSM), 1817M (LTE), 2115M (3G), 2450M (Wifi/Bluetooth) http://i.imgur.com/FwzVgMx.jpg You can get an idea of the switch time by looking at the duration of the GSM FCCH signal ( which is ~ 4.6 ms long ) The hardware can only store 8 profiles internally but you can upload / download profiles via SPI while another profile is running and so my plan was to use the FPGA to upload next profile and switch to it at times interval. The client for that project disappeared and so I never continued to actually implement it ... Cheers, Sylvain
