For AM directional systems, Tunwall Radio offers compact plc-based controllers. Custom designed for each station and built on a two-piece aluminum panel and shelf, the rack mountable units are typically 8.75” H x 19” W x 20” D. Programmable logic controllers replace any number of relays, saving space and hardware expense. PLCs perform very well in industrial environments, which typically present several challenges to electronic equipment; heat, dust, vibration, magnetic fields, and power line transients.
Like the TRC Series, Tunwall Radio AM directional controllers feature simple pushbutton operation. Timed sequences remove RF power, move contactors and verify positions before RF power is restored. Front panel indicators show pattern and transmitter in use, and position of all RF contactors in the system. Local, off and remote modes are selected with a key switch. There is also an emergency bypass mode.
All controls and indicators are labeled on engraved anodized aluminum plates. There are no screens to navigate, and nothing to program. All of the controller’s functions are preloaded into the PLC.
The control outputs are 24VDC, so no high voltage is wired to the controller, allowing phasing systems with contactor pilot relays to be directly connected. In cases where a station’s contactors receive 120 or 240 VAC, an additional cabinet is available. This 2 RU aluminum box contains 24 volt power relays to switch the AC.
Browse our gallery below to see AM Directional systems we have built. If you would like a quote, fill out the form here or call us.
Non directional AM stations can utilize one of our TRC Series single or dual switch controllers. See our TRC Series page for details.