4208 Off-Air Mobile Tester

The new 4208 Off-Air Mobile Tester has been specifically designed to measure over longer distances over the air without a cable connecting the tester with the mobile phone.

Using the 4208, car manufacturers can test GSM mobile phones integrated in the car or a hands-free kit. The 4208 is located beside the assembly line with antennas or radiating cables mounted above it. The 4208's higher receiver sensitivity of -54 dBm and increased output level of -24 dBm support measurements over the antenna rather than over a cable. The 4208 quickly verifies the radio and audio connections in an end-to-end automated test designed to prevent customer dissatisfaction and high repairs costs caused by the car's infotainment system.

• Separate RX and TX paths for using an external amplifier; allows customers to cover larger distances
• Higher receiver sensitivity: measurements down to -54 dBm, connection possible down to -60 dBm
• Higher output level: -24 dBm
• Improved call processing functions for tests under interference conditions
• Small GSM mobile tester with low power consumption

Special features:

• Selectable number ranges for IMSIs which are accepted, e.g. 4208 can reject all mobile phones without a test SIM
• Special Location Update procedure for bad signal conditions.
  During off-air measurements, bad signal conditions are likely. To solve this problem, the location update prodcedure for the 4208 has been made more fault-tolerant than in other 4200 units.
• Power measurement during Location Update (in remote mode)
  After a successful location update, the receive power during location update can be measured using a special SCPI command.
  This is useful for fast measurements or adjusting the BS power after a location update if the connection is at risk to be interrupted.