T-3 Transmitter

Multipurpose Current Source

The T-3 is a lightweight, versatile multipurpose signal source for use in a variety of geophysical techniques. Weighing only 12 kg, it is easily transportable on a backpack over virtually any terrain. The T-3 can drive either inductive loads (loops) used in TDEM or FDEM techniques, or grounded dipoles used in IP, Resistivity, and CSAMT techniques.

Features T-3 Transmitter

T-3 Transmitter
  • Low cost

  • Lightweight, highly portable

  • Operates at -20°C to +50°C

  • No cable links required between transmitter and System 2000.net receivers (V8, RXU)

  • Wide range of power sources:
    50Hz or 60Hz motor generators or
    12V batteries

  • 32Hz to 16s (Time Domain);
    ~10kHz to 8s (Frequency Domain)

Proven Technology

Phoenix design experience extends over 40 years, and the T-3 builds on this record. T-3 transmitters have been used in countless field surveys under every climatic condition worldwide.

Wide Range of Power Sources

The T-3 can be powered by one or more external 12 V batteries or by Phoenix's selectable-voltage BP-24/72 battery pack. Alternatively, the power source can be a standard geophysical motor generator, or any of a number of commercially available 50 Hz or 60 Hz motor generators. This flexibility means that the power source (and parts and service) can be obtained almost anywhere in the world.

System Integration

The T-3 can be controlled by a System 2000.net RXU-TM transmitter monitor, with or without radio networking to a V8 receiver.

T-3 Transmitter

Summary Specifications


20 x 40 x 55cm




Output current (LCD); line voltage or output voltage (switchable meter)

AC Input

50 or 60 Hz, 200-240V, =3.5kVA

DC Input

12-72V transmission and 12V control

Output Voltage

300V, 600V, or 1100V nominal (1000V maximum in regulated markets)

Output Power

Maximum 2.2kVA

Output Current

50mA to 9A

Current Regulation

Output ± 0.2% for ±10% variation in input voltage or electrode impedance

Internal Timing

32 Hz to 16s (Time Domain); ~10 kHz to 8s (Frequency Domain)

External Timing

DC to ~10 kHz, via cable link to suitable receiver or clock source such as RXU-TM, RXUTMR, or MTU-TXC. (RXU-TMR includes radio networking with controlling V8-R multifunction receiver). All Phoenix receivers and clock sources are GPS synchronized.


Over-current (10.2A max.)
Under-current (~0.05A min.)
Over-voltage (100% of full scale)


Operating: -20°C to +50°C

T-3 Transmitter



Controlled Source Audio MT


Induced Polarization: Frequency and Time Domain, Phase and Spectral IP


All common Time and Frequency Domain Electromagnetics functions


All common Resistivity functions (Dipole, Schlumberger, or Wenner soundings)