How can I minimize RF interference when operating multiple DME, transponder, TAS or TCAS units?
RF interference can occur due to these units operating in the same frequency range (962 to 121MHz), either from unit to unit or antenna to antenna. One way to minimize the problem is to have a separation of 6 feet from antenna to antenna. Another way is to have suppression between the transmitters. To create a suppression interface, the suppression lines between the units must be connected. However, this can only be done if the connected units are compatible. Before attempting to connect the suppression circuits, the compatibility of the units must be confirmed. If improperly matched, the suppression interconnect does not work and damage occurs to the circuitry. The units can be incompatible due to the unit’s suppression pulse, which can be bilateral or unilateral depending on the unit. Both connected units must have the same suppression pulse. The two charts below provide information about the suppression pulse of Honeywell units. The first chart indicates the type of suppression puls
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