Active Three-Pair Sender-Twisted Pair Format-A-balanced line inputs

Ideal Use Cases

The RDL TX-TPS3A is an active sender for systems that need to place three audio inputs onto RDL TP Format-A signal pairs A, B and C. It accommodates +4 dBu balanced sources through detachable terminal blocks and -10 dBV unbalanced sources through phono jacks. This combination makes the module appropriate when professional balanced equipment, consumer-level unbalanced equipment, or a mixture of the two must connect to a Format-A installation. All three Format-A pairs are used, providing a defined path for three input channels through the RJ45 output.

Why Choose This Model

The TX-TPS3A combines flexible input connectivity with precision active balanced circuitry. Its six input connections comprise three 20 kΩ balanced inputs and three 10 kΩ unbalanced inputs. Nominal input levels are +4 dBu balanced and -10 dBV unbalanced, with a specified maximum input level of +22 dBu. The module can receive power locally or remotely through its RJ45 connection. When locally powered, it also supplies power to all modules connected to the OUTPUT, reducing the need for separate power connections at every connected module.

A blue LED provides visible confirmation that the module is powered. Wiring-fault protection is handled by an automatically resetting fuse, allowing the power circuit to recover after the fault condition is corrected.

Installation and Integration

Balanced inputs connect through the detachable terminal block, while unbalanced inputs use phono jacks. The three audio channels feed Format-A pairs A, B and C, and the RDL TP Format-A output is presented on an RJ45 connector. Power can enter through any of three connections: the dc power jack, the detachable terminal block, or the RJ45 connector.

The module requires 24 Vdc at 65 mA plus the requirements of connected loads. Recommended power supplies, which are not included, are the PS-24AS for the USA and the PS-24AX for international use. The enclosure measures 3.17 inches wide, 1.76 inches high, and 2.06 inches deep, equivalent to 8.05 by 4.47 by 5.23 cm. Its specified ambient operating range is 0° C to 55° C. These compact dimensions and multiple power-entry options provide clear integration choices without changing the module’s three-pair signal assignment.

Performance Highlights

The TX-TPS3A is specified for a frequency response of 10 Hz to 50 kHz within ±0.1 dB. THD+N is listed at less than 0.005%, while available headroom above the +4 dBu nominal level is greater than 18 dB. Common-mode rejection is greater than 60 dB from 50 Hz to 150 Hz.

• Frequency response: 10 Hz to 50 kHz, ±0.1 dB
• THD+N: Less than 0.005%
• Noise below +4 dBu: Less than 90 dB
• Crosstalk: Less than 85 dB at 1 kHz; less than 70 dB from 20 Hz to 20 kHz
• Headroom above +4 dBu: Greater than 18 dB
• CMRR: Greater than 60 dB from 50 Hz to 150 Hz

What Makes It Different

This model is specifically arranged to use all three RDL Format-A signal pairs rather than a single pair. It brings together balanced terminal-block inputs, unbalanced phono inputs, and an RJ45 Format-A output in one active module. Its local-power distribution capability is another defining feature: power applied locally can feed every module connected to the OUTPUT. Remote powering through the RJ45 jack is also supported, giving the installer a choice based on where power is available. The automatic-resetting fuse and power-status LED add direct protection and status indication to the installation.

Final Assessment

The RDL TX-TPS3A is a purpose-built choice for routing three +4 dBu balanced or -10 dBV unbalanced audio inputs onto Format-A pairs A, B and C. Its studio-quality precision active balanced circuitry, wide specified frequency response, low THD+N, three power-connection options, and ability to power connected output modules address both signal quality and practical integration. For an RDL TP Format-A system requiring a compact active three-pair sender, its channel arrangement and connection formats are clearly defined.