NDB Transmitter Type JTM-50C can be delivered as a 400 W PEP (100 W carrier) or as a 1000 W PEP (250 W RMS Carrier) Transmitter.

It consists of an Antenna Tuning Unit (ATU), a 19" Transmitter Rack and Remote Control(s).

ATU-2 contains an Antenna tuning Coil and a Matching Transformer to match the reactive Antenna impedance into 50 ohm to the Transmitter.  The ATU-2 circuits are mounted inside an IP66 weatherproofed and ruggedized cabinet. The ATU shall be installed at the Antenna.

Tuning and matching the antenna impedance to 50 ohms is a manual procedure.

An Auto Tune function is offered as an option. 

A heater element is installed inside the cabinet to reduce humidity at low temperature.

The heater element should be powered from 24 VDC via the Transmitter Cabinet.

The Transmitter Cabinet is a 19" rack provided with panels for RF generating unit (Exciter(s), Transmitter Amplifier(s), RF Output Panel, DC/DC Converter(s), Power Supply / Battery Charger, Cable Harness and terminals for connection to external equipment such as Remote Control Unit, PC,  External Alarm circuits etc. etc.  

The transmitter can be powered from AC Mains (115/230 VAC) via an internal Power Supply/Battery Charger which supplies 24 V DC to the equipment, or direct from an external 24 V Battery Bank. 

Main source of energy for the Cabinet is 24 VDC. The DC/DC converter(s) 24 VDC to 150 VDC supplies voltage to the RF Power Amplifier(s).

The 19" Rack is designed for indoor installation.