dBD Communications completes Network Rail Sevenoaks tunnel Managed Service - Aug 2016
dBD recently completed a Managed Service shift with Mark Acott of Network Rail at the Sevenoaks Tunnel in August 2016, providing Radio Communications. The tunnel is just under 2 miles long and a preliminary inspection and survey of the site was required. This survey was executed by Norman Bowdler and James Bolton in July and gave us an idea of what equipment would be essential to perform the shift effectively.
The kit that was used was a Hytera RD965 Repeater system and EMR Corp Duplexer that was used for radio splitting. This was setup at the mouth of the tunnel with antenna configurations pointing in both directions. We experienced issues to start with surrounding one of the smaller antennas used, but was swiftly resolved with the use of the large Yagi Antenna that provided comms through the tunnel and back to the control room (SAC). This can be seen in the pictures.
Photo - Steve Binstead showing that the job can be performed no matter what the conditions and how much of a challenge getting the power source to and from the mouth of the tunnel.
On original inspection, there was a GSMR antenna on the wall for train driver comms (see photo below) which proved that the Sevenoaks Tunnel could support radio comms. However our engineers still had to perform calculations to work out a solution to achieve a more superior transmission and without doubt this was reached.
Photo – GSMR radio comms antenna in Sevenoaks Tunnel
Photo – dBD repeater and antenna setup at mouth of tunnel
Overall the shift was deemed a success and we look forward to our Managed Service engineers working with Network Rail on the tunnel in the near future.