5211 Wireless Interface Test System

5211 Wireless Interface Test System

The ETS Model 5211 Wireless Interface Test System, (WITS™), is a self-contained portable enclosure that can check cell phone transmit and receive functionality with or without direct cable connection to the RF or data ports. This is accomplished using a patent-pending near field coupler in the enclosure that couples with the phone’s own antenna. The coupling coefficient has a flat response over the frequency range of 700 MHz – 2 GHz. With this (CAI), or common air interface, the operator performs the test faster and simulates a real-world environment. In contrast, the direct connection method bypasses the antenna and adds up to several dB of loss to the measurement. The CAI method provides a shorter signal path and readily detects a faulty antenna. (A connector is provided for testing with a direct connection if desired.) To eliminate nulls and hot spots, each enclosure is lined with ETS-Lindgren RF absorber, which improves test repeatability. Compressible RF gasketing is used to seal the lid on closure. It has nominal shielding effectiveness > 80 dB, although higher values are possible. Consistent orientation of the phone in the enclosure is important for test repeatability. To help the operator position the phone correctly, a sliding clamp and alignment post are built into the bottom of the enclosure. The base is also marked with an illustration of a typical phone position. Electrical Specifications

Frequency Minimum 700 MHz
Frequency Maximum 2 GHz
Coupling Factor 1850 MHz - 1990 MHz <11 dB 824 MHz - 894 MHz <8dB Note: Typical, to resonant dipole 1 in. from coupler surface.
Typical Coupling Factor Repeatability ±1 dB
Typical Internal RF Absorption 1800 - 2000 MHz Q<2 800 - 1000 MHz Q<2
Typical RF Isolation 1 MHz - 2 GHz >80 Db

Key Features

  • Works with Mobile/Cellular Radio Test Sets: HP 8924
  • >80 dB Typical RF Isolation
  • On-The-Air Test TX, RX Functionality Without Direct Cable connection to Cell Phone Data Port
  • Flat Coupling Response over 700 MHz – 2 GHz
  • Custom Configurations Available
  • Phone Placement Fixture Assures Test Repeatability

Application Notes