Sunday, February 21, 2016

Dolphin TETRA Network

I've been doing a bit of readin about the Dolphin Telecom TETRA Network and thought I'd share. 

Dolphin TETRA was a mobile network operator using the TETRA radio access technology. Dolphin's initial network was in the United Kingdom but they also built networks in France, Germany and Belgium. The idea was to provide a 4-in-1 service with the ability to have telephone functionality along with UHF two way radio, SDS which was the TETRA equivalent of SMS, and packet data. 

Dolphin TETRA never really took off because the sound quality of the telephone service was poor and that the technology never delivered a working packet data service on any of their networks.

On 1 August 2001, the company went into administration and the majority of their people were made redundant. Another set of redundancies were made later that year and the network ran on a skeleton staff. In June 2002 the network was bought by Inquam for £25m. The service was still marketed under the Dolphin Telecom brand name although Inquam struggled to operate the network profitably. On 31 July 2004 the network was finally switched off.

The UK Police service bought up much of the infastructure implemented by Dolphin when they switched their communications from analogue to TETRA in the mid 2000's. 
The new all digital civil Tetra (Trans European Trunked Radio) system operates on:

  • 410-415 MHz portable transmit
  • 420-425 MHz base transmit
  • Band ranges from 410 to 430 MHz subject to future expansion.
I found it interesting that after all this time the website is still online albeit useless.

Thanks for reading!

73's, Lewis M3HHY.

Manchester, UK. 

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