The Nissei DG-503 SWR / Power meter covers 1.6 - 60 MHz and 125 - 525 MHz using two separate directional couplers

Calibration points are 14MHz / 50 MHz / 145 MHz and 435 MHz.  This provides for an accuracy of +/- 5%.

Maximum Power handling is 200W.  Insertion loss 0.3 dB or less.  A minimum of 1W is required for SWR indication.

Impedance: 50 ohm.  Coaxial connectors:  HF - type UHF female,  VHF/UHF - type "N" female

For operation, the DG-503 requires 13.8V to be supplied (pluggable DC cable included - DC power source not included)

Dimensions: 140w x 82H x 122Dmm

The DG-503 is also badged for MFJ and sold as the MFJ-849