While looking through some (actually, several) of the available additions to the Raspberry Pi, I notice there are several that are transmitter/receiver units and that many of those items have operating frequencies very close to, or in, portions of the radio spectrum authorized for use by amateur radio operators in many nations around the world. Specific units of interest are those that show operating frequencies near the 70 cm (420.0 MHz to 450.0 MHz), 33 cm (902.0 MHz to 928.0 MHz), and 23 cm (1240 MHz to 1300 MHz). My question is, would it be possible to modify one of the units already operating near (or possibly in) the bands listed here to a point where the unit was operating entirely within that band? The reason for asking is that some amateur radio operators near my location are interested in building networks that do not rely on any ISP for data transmission. In some cases, the resulting net could be used for normal amateur communications. In other cases, those nets could be used to help during emergency communication events. Thank you for considering this.
