The DG 503 MAX is an advanced measurement and test instrument designed for use in frequencies from 1.6-60 MHz and 125-525 MHz. It supports a power range from 0 to 200 W, making it ideal for amateur and professional radio applications. It provides accurate forward (FWD), reflection (REF) and standing wave ratio (VSWR) measurements, as well as the ability to measure in DMR (TDMA) /SSB / AM modes.