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

The RDL TX-TPS1A is an active single-pair sender for placing one balanced or unbalanced line-level source onto an RDL TP Format-A connection. It accepts +4 dBu balanced audio through a detachable terminal block or -10 dBV unbalanced audio through a phono jack. A switch assigns the outgoing signal to RJ45 pair A, B, or C, while studio-quality precision active balanced circuitry handles the signal path.

Ideal Use Cases

This model fits Format-A systems that need to add a single line input while preserving control over the pair it occupies. Use the balanced terminal-block connection for a +4 dBu source or the phono connection for a -10 dBV source. It is also suited to configurations that extend an existing Format-A chain through the LOOP IN jack or installations where several single-pair and two-pair Format-A senders are daisy-chained. Selectable A, B, or C assignment places the input on the required signal pair.

Why Choose This Model

The TX-TPS1A combines two common input interfaces with flexible signal routing and power options. Its balanced input has a 20 kΩ impedance, while the unbalanced input has a 10 kΩ impedance. The specified maximum input level is +22 dBu, with more than 18 dB of headroom above +4 dBu. A blue power LED provides immediate operating confirmation. Local or RJ45 power capability also allows the module to adapt to different Format-A wiring arrangements without changing its core audio function.

Installation and Integration

Connect a balanced source to the detachable terminal block or an unbalanced source to the phono jack, then select Format-A pair A, B, or C. The Format-A output uses an RJ45 connection, and the RJ45 LOOP IN jack provides signal and power-pair pass-through. The module can receive power remotely through RJ45 or locally through either its power jack or detachable terminal block.

When local power is used, the fused supply feeds modules connected to the RJ45 jacks. The power requirement is 24 Vdc at 35 mA plus connected loads. Recommended supplies, which are not included, are the PS-24AS for the USA and PS-24AX for international use. The module measures 3.17 inches wide, 1.76 inches high, and 2.06 inches deep. Its specified ambient operating range is 0° C to 50° C.

Performance Highlights

The active balanced circuit has a specified frequency response of 10 Hz to 50 kHz within ±0.1 dB. THD+N is less than 0.005%, and common-mode rejection is greater than 60 dB from 50 Hz to 150 Hz. Noise below a +4 dBu level is specified at less than 90 dB. These figures are paired with more than 18 dB of headroom above the nominal +4 dBu balanced level, providing concrete performance criteria for system planning and comparison.

The input-level arrangement directly supports +4 dBu balanced and -10 dBV unbalanced sources. The terminal block and phono jack keep those connection methods distinct, while the switch-selectable Format-A output determines which RJ45 signal pair carries the selected input.

What Makes It Different

The TX-TPS1A brings pair selection, loop-through connectivity, and three powering methods into one compact sender. Signal and power pairs pass through from LOOP IN, allowing the module to join a continuing Format-A connection. It can also daisy-chain with both single-pair and two-pair Format-A senders. If power is supplied locally, its fused power path can feed all modules connected to the RJ45s; when local power is not preferred, the sender can instead be powered remotely through RJ45.

Final Assessment

The RDL TX-TPS1A is a focused choice for sending one +4 dBu balanced or -10 dBV unbalanced input over RDL TP Format-A. Its selectable A, B, or C pair assignment, LOOP IN pass-through, local and remote power support, compact dimensions, and documented active-circuit performance make it a versatile building block for compatible Format-A signal chains.