3. APS-3 Device & Specifications 
 
3.1.  Internal UHF Radio 
The APS-3 may be equipped with either an Arwest or a SATEL internal radio. 
If the APS-3 is equipped with a SATEL radio, there is a sticker in the left battery 
compartment indicating this 
Figure 7: SATEL sticker 
 
Specification 
 Operating Frequency: 406 MHz to 470 MHz 
 Occupied Bandwidth:  6.25kHz, 12.5kHz or 25kHz 
 Gain: 145-146dBm 
 
How do I configure my UHF 
Radio? 
Configuration is done via data collector software 
or dedicated tools located in the UHFRadio 
folder on the USB stick 
My rover is not receiving RTK 
corrections. 
  Make sure that Base Station receiver is 
receiving more than 5 Satellites. 
  Check Rover Configuration is set to use the 
same RTK message type as Base. 
  Check Base Station and Rover use the same 
UHF Radio Channel and settings.