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I've got a customer with 2 SLC 5/04s in separate buildings and a KT card in a PC based SCADA system all connected by DH+. The customer, a local village public works department, uses fixed and mobile radios communicating on 39.10 mHz. The DH+ seems to generate considerable RFI on this frequency, even with the A-B supplied ferrites installed on the blue hose. Anyone seen this before and found a solution, other than to get another radio frequency?