TRC SERIES CONTROLLERS
Preprogrammed. Compatible with all coax switches.
A switch controller from Tunwall Radio provides protection for transmitters and coax switches. Without an active switch and transmitter controller, operator error can easily result in burned-out switches and off-air time. Our controllers use a timed sequence to remove RF power, move the switch(es), and verify switch positions before RF power is restored. The controller’s automatic load interlock allows easy load testing with load protection – the controller will not allow the off-air transmitter to operate unless the load's air or water is running.
Tunwall Radio controllers will save you time because there is no need for you to program anything. The pre-programmed PLC (programmable logic controller) in the TRC controller provides control and logic for the coaxial switch and transmitters. The coaxial switch(es) plug into 9-pin AMP connector(s) on the controller, and transmitter and remote control connections are made to barrier strip terminals.
Unlike most other controllers, Tunwall Radio controllers are compatible with all standard coaxial switches. The TRC-1, 1P, 2 and 2A can also be used with RF contactors for non-directional AM stations. Optional controller-to-switch cables can be made to your desired length for any switch type.
No rewiring coaxial switch cables if your switch position 2 is “normal” – TRC controllers easily reverse switch logic and control, individually for multi-switch systems.
Controllers are not useful if no one can figure out how they work. The TRC series unique front panel flow chart graphic with switch position indicators displays the RF signal path and load status. Front panel pushbuttons make operation simple.
The key switch operated local mode prevents remote commands during maintenance. The key switch operated auto transfer function can change transmitters automatically upon main failure.
The NAIS programmable logic controllers used in TRC controllers have proven to be extremely reliable. We are not aware of a single PLC failure after any TRC controller installation since the beginning of the series in early 2004.
2010 Models
TRC series controllers are available in several models detailed below. The five standard models in the TRC Series (TRC-1, 1P, 2, 2A, 3) along with controller-to-switch cables, are available for purchase directly through Tunwall Radio or from various broadcast equipment dealers.
A list of dealer reps is available here.
TRC-1
The TRC-1 controller is an FM or AM non-directional controller. It is designed for one coax switch or 120V AM contactor, two transmitters, one antenna and a dummy load. The key switch selected auto function will transfer to the aux transmitter upon failure of the main transmitter. The dummy load ready light works with the load interlock logic for automatic load protection.
Lead time: 1 to 2 weeks.
TRC-1P
The TRC-1P controller is a one-switch controller with all of the features of the standard TRC-1. It also includes plate on/plate off functions for both transmitters.
Lead time: 1 to 2 weeks.
TRC-1 vs. TRC-1P
TRC-1 front and rear panel drawing
TRC-2
The TRC-2 controller is an FM or non-directional AM controller. It is designed for two coax switches or 120V AM contactors, two or three transmitters and two antennas. The key switch selected auto function will transfer to the aux transmitter upon failure of the main transmitter. The dummy load ready light works with the load interlock logic for automatic load protection.
Lead time: 2 weeks
TRC-2 front and rear panel drawing
TRC-2A
The TRC-2A controller offers the same features as the TRC-2, but with a different switch and antenna arrangement. The TRC-2A can also be used by AM non-directional stations with an aux antenna.
Lead time: 2 weeks
TRC-2A front and rear panel drawing
TRC-3
The TRC-3, our three switch controller, is for combined FM transmitter systems. It is designed for three coax switches, one antenna and a combiner/injector. Logic for a third transmitter is programmed on this controller. The key switch selected auto function will transfer to separate transmitter 1 or 2 mode if either fails. The dummy load ready light works with the load interlock logic for automatic load protection.
Lead time: 2 weeks
TRC-3 front and rear panel drawing