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...id number warning tone. MWOD data is stored in non-volatile memory within the radio set. Seven memory locations are available for each MWOD with the capability of storing a maximum of six MWODs within the radio set. The channel selectors, the manual frequency selectors, and the tone button are utilized to load the required segments for each MWOD. Channel positions 20–14 are used to facilitate the loading of MWOD segments. A minimum of one WOD must be stored for the unit to be functional in the AJ mode. Channel position 14 is used for day-of-month information (date code). The date code is represented by frequency 3AB.000 MHz in which AB is the day of the month. For example; if today’s date is the 15th of the month, the date code entry would be 315.000 MHz. Channel position 1 is used for entering the current operational date is the same as the date code format. When the radio is turned off or power is lost after entry of MWOD and date code, the data is not lost; therefore, the information remains intact until manually changed or erased. The six most recently entered MWOD’s are retained. If a MWOD with duplicate date is entered, the new entry takes precedence. After the MWOD information is entered, the pilot would proceed to obtain the TOD. Operational date information is part of the HQII TOD message. If HQII TOD message is unavailable, the pilot must manually enter the operational date so the radio can select the proper MWOD. If power is lost, operational date is lost and must be re-entered. HQ mode: The HQ mode of operation provides a jam resistant capability by means of a frequency hopping technique that changes frequency many times per second. Automatic frequency changing in an apparently random manner provides the jam resistance of the radio. The HQ radios permit communication in radio-jamming environments. Three elements are required for uninterrupted successful communication. Radios must use the word-of- day (WOD), be time-synchronized with each other with a time-of-day (TOD), and share a common net. WOD. Common frequencies, hopping pattern, and rate are determined by the operator entered WOD. The WOD is a secret, tactical, multi-digit code that changes daily, and is available worldwide to all HQ users. The WOD programs the radio with the frequency hopping pattern and rate. The hundredths/thousandths digits in the channel 20 WOD element program the frequency hop rate with .00 being the slowest and .75 being the fastest. WOD elements vary in number and are entered by using one or more of the six preset channels 20 through 15. Channels containing WOD elements cannot be used in the normal preset function. Transmissions can be made in WOD channels, but they will not be on the frequency stored in the preset channel memory. The WOD is initially entered into the preset memory and then transferred to volatile memory. After transfer, if power is lost or if channel 20 is selected when the function switch is set to PRESET, it will be necessary to perform another transfer from the preset memory to volatile memory. Start with channel 20 and set to progressively lower channels until a double beep is heard. The radio will not function in the AJ mode if a WOD is not in volatile memory. If the AJ mode is selected without entering a WOD into the volatile memory, a steady warning tone will be heard in the headset. TOD. Time synchronization is provided by a clock inside the radio. The internal clock is turned off when the radio is turned off. A TOD signal must be received to reset the radio’s internal clock when the radio is turned on. This signal may be provided by another HQ radio or by an external time distribution system. Improper synchronization will prohibit proper communication. Reception of garbled communications in the AJ mode indicates the receiving radio and transmitting radio are not in synchronization. In a multiple radio net, the radio receiving all transmissions garbled is the radio that is out of synchronization. If no TOD is available from another HQ radio, an emergency start of the TOD clock can be performed using the T position of the A-3-2-T switch and the TONE button. E...