23BARRETT 4050 HF SDR TRANSCEIVER - SELCALLImportant Selective Calling InformationSelcall Self IDsThe 4050 transceiver can hold up to 14 different Selcall Self IDs assigned to it.These Selcall IDs can be any combination of four or six digit OEM or INT type ID.Selcall DecodeThe transceiver has the ability to decode both OEM and International Selcallson any channel programmed as a Selcall channel. However, the call must beaddressed to the relevant ID (OEM or INT).Calls for each format type will only be decoded if there is at least one Self ID ofthat format programmed into the transceiver Self ID group.Selcall TransmitSelcall formats in transmit are channel specific. For example, only call typesprogrammed for the channel are permitted. This means International formatcalls can only be sent on channels that are programmed as International Selcallchannels. OEM calls can only be sent on channels that are programmed as OEMSelcall channelsSpecial Notes for the OEM Selective Call Protocol• Six digit OEM 1 calls will only be decoded by other Barrett transceiversfitted with the OEM 1 Selcall protocol or other manufacturer’s transceiversthat use DES56 encryption. This does not require an export permit.• Four digit OEM 1 calls will be decoded by Barrett 950 and 2050 transceiv-ers using the International Selcall (four and six digit) and other manufac-turer’s transceivers with similar CCIR-493 based Selective Call systems.• Four and six digit GPS and Status data calls use the OEM privacy key toencrypt the data. If this eight digit key has not been programmed by theprogramming software, a default privacy key of 99999999 is automati-cally used for transmission.• Four and Six digit Page calls also use the privacy key but unlike the othercalls, the user has the option to manually enable or disable the privacy key.When disabled, the data is sent as plain text.• Emergency GPS calls are automatically sent as plain text (four and six digit).
