938 Series Civil DF

The 938 Series of civil Direction Finders (DF) provide a range of integrated DF solutions for bus-controlled and stand-alone direction finding systems. 938 DFs include an integral synthesised receiver covering the frequency range 88 MHz - 470 MHz, together with 5 Guard Receivers to monitor pre-defined distress frequencies. Bearings may be taken on all 6 receivers simultaneously. Data decoding is provided for COSPAS‑SARSAT messages and for marine DSC messages on the associated Guard Receivers. There is also the option to output On Top Position Indication (OTPI).

COSPAS-SARSAT decoding
Marine DSC decoding
Discrete outputs OTPI and distress alert
Compatible with Chelton 718-40 DF Controller
Discrete OTPI output

The VHF, Maritime and UHF Guard Receivers have a Main channel and an associated Auxiliary channel. The Main channels are pre‑programmed, while the Auxiliary channels can be programmed by the Customer. Such an arrangement allows distress monitoring to take place on the Main frequencies and training to be carried out on selectable Auxiliary frequencies.

The GMDSS DSC Guard Receiver is pre-programmed to the VHF DSC Channel 70. The system may be programmed to monitor and report Distress Alerts, All-Ships Calls, Selective Calls and either Distress or Urgency categories. Full reporting of the vessels MMSI, Nature of Distress and GPS coordinates is made available to the user.

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