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Upgrade the antenna for the Siemens Direct Digital Control system, The wireless network is proprietary to Siemens and only an authorized Siemens Technician can make any changes and work on it. Looking... Upgrade the antenna for the Siemens Direct Digital Control system, The wireless network is proprietary to Siemens and only an authorized Siemens Technician can make any changes and work on it. Looking for a skilled specialists to provide the necessary equipment to upgrade the Siemens DDC System and that are authorized to work on Siemens equipment.