EM16/EM16R VLF Receiver
TX27 Transmitter

Features

• Measures the local tilt and ellipticity of VLF broadcasts and resolves values into inphase and quadrature components of VLF response.

• Combined EM I 6/16R instrument can detect a second earth-layer if the layer occurs within the VLF skin depth.

• Maps resistive alteration for gold exploration.

General

The EM16 is a widely used EM instrument. The unit measures the local tilt and ellipticity of VLF broadcasts, and resolves values into inphase and quadrature components of VLF response. EM16 units have discovered several base and precious-metal ore bodies, and many water-bearing faults.

The EM16R attaches to the EM16 and uses a pair of electrodes to measure the apparent resistivity of the earth. The combined EM16/16R instrument can detect a second earth-layer if the layer occurs within the VLF skin depth. In addition, the EM16/16R can map resistive alteration for gold exploration.

The TX27 is a portable VLF transmitter that supplies a VLF field for surveying with the EM16/16R if remote broadcasts are weak, intermittent, or poorly coupled with the target. For EM16 surveys the TX27 antenna consists of a long (1km) grounded wire.

Specifications

EM16/EM16R Measured Quantities:

EM16: Inphase and quadrature components of the secondary VLF field, as percentages of the primary field

EM16R: Apparent resistivity in ohmmeters, and phase angle between Ex and Hy

Sensors:

EM16: Ferrite-core coil, tuned by plug-in crystal.

EM16R: Stainless-steel electrodes, separated by 10m, impedance of sensor is 100MOhms in parallel with 0.5pF

Measurement Ranges:

EM16: Inphase: ±150%, Quadrature: ±40%

EM16R: 300, 3000, 30000 Ohm-m, Phase: 0-90°

Weights:

EM16: Operational: 1.8kg, Shipping: 6.2kg

EM16R: Operational: 1.5kg, Shipping: 6kg

Primary Field Source: VLF broadcast stations

Operating Frequency: 15 to 30kHz, depending on VLF broadcasting station

Power Supply: EM16/16R - 6 alkaline 'AA' cells

Dimensions: EM 16and/or EM16R: 53 x30 x 22cm

TX27 VLF Transmitter

Weights:
    Operational: 29kg
    Shipping: 68kg

Primary Field Source: Grounded wire or 500 x 500m loop, current adjustable, 0 to 2A

Operating Frequency: 18.6kHz

Power Supply: 120/240V, 350W motor-generator

Dimensions: 88 x 29 x 39cm

Standard Components

Instrument console, crystal for one VLF station, shipping case and manual.

Ordering Information

TOP

Home | About Us | What's New | Products | Rentals | Second Hand | Case Histories | Search | Contact Us