Passive Single-Pair Sender-Twisted Pair Format-A-balanced line input

The RDL TX-TPS6A is a passive, single-pair sender that places one +4 dBu low-impedance balanced audio input onto an RDL TP Format-A connection. The balanced source connects through a detachable terminal block, while a selector determines whether the signal feeds RJ45 pair A, B, or C. An RJ45 LOOP IN connection provides signal and power pair pass-through, supporting daisy-chain configurations with single-pair or two-pair Format-A senders. Because its circuitry is passive, the TX-TPS6A requires no operating power.

Ideal Use Cases

This model is intended for Format-A systems that need to add a single balanced audio source to a selected twisted-pair signal pair. It is particularly applicable when an existing Format-A feed must continue through the LOOP IN connection while another +4 dBu source is introduced. Switch-selectable pair assignment makes the unit suitable for systems using pair A, B, or C without requiring a different sender for each position. Its passive design also addresses installations where supplying power to the sender is unnecessary or undesirable.

Why Choose This Model

The TX-TPS6A combines flexible pair selection with transformer-isolated audio transmission. Its input is designed for a low-impedance balanced source, with a recommended source impedance below 150 ohms. The nominal input level is +4 dBu balanced, and the input accommodates levels up to +22 dBu. Galvanic isolation is provided through a studio-quality transformer, separating the balanced source from the Format-A connection. The detachable terminal block supports the balanced input, while RJ45 connections are used for Format-A LOOP IN and output.

Installation and Integration

Integration centers on the balanced terminal-block input, the RJ45 LOOP IN port, and the RJ45 Format-A output. Connect the low-impedance balanced source to the detachable terminal block, then select pair A, B, or C for the transmitted signal. The LOOP IN jack passes Format-A signal and power pairs through the unit, enabling the TX-TPS6A to be daisy-chained with compatible single-pair or two-pair Format-A senders. The enclosure measures 3.17 inches wide by 1.76 inches high by 2.06 inches deep, allowing its physical requirements to be evaluated before installation. The specified ambient operating range is 0 degrees C to 50 degrees C.

Performance Highlights

The specified frequency response is 20 Hz to 20 kHz within plus or minus 0.1 dB. THD+N is below 0.035% from 50 Hz to 20 kHz at +4 dBu and below 0.1% across 20 Hz to 20 kHz at +4 dBu. Headroom above the nominal +4 dBu level exceeds 18 dB. Common-mode rejection exceeds 85 dB from 50 Hz to 150 Hz. Together, these published measurements define the sender’s audio bandwidth, distortion performance, input-level capacity, and rejection of common-mode signals.

What Makes It Different

Rather than requiring a powered sender for one balanced source, the TX-TPS6A performs its function entirely through passive circuitry. The studio-quality transformer supplies galvanic isolation without an external power requirement. Its A, B, or C pair selector provides assignment flexibility within the Format-A connection, and the LOOP IN pass-through preserves signal and power pairs for continued system routing. This combination of passive operation, selectable pair use, and daisy-chain compatibility defines the model’s role within an RDL TP Format-A installation.

Final Assessment

The RDL TX-TPS6A is a focused interface for routing one +4 dBu low-impedance balanced source into a TP Format-A system. It provides a detachable balanced input, selectable use of pair A, B, or C, RJ45 LOOP IN and output connections, transformer-based galvanic isolation, and passive operation. For installations requiring a single-pair sender that can join a Format-A daisy chain while maintaining published 20 Hz to 20 kHz performance, its specifications provide a clear basis for system matching.