MIL-STD-188-243 Tactical Single Channel Ultra High Frequency UHF Radio CommunicationsThe purpose of this document is to establish the minimum essential interoperability and performance requirements necessary for tactical single channel UHF radio communications equipment. This standard addresses ground-to-air, air-to-air, ship-to-shore and ship-to-ship tactical single channel UHF radio communications equipment. The requirements established by this document may be exceeded in order to satisfy specific operational requirements or to incorporate technological improvements, provided that interoperability be maintained.

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MIL-STD-188-243A

5.2.1.9.5 Modulation and Data Signal Rates. Radio equipment that is equipped with a data modem shall comply with the applicable requirements of MIL-STD-188-110 and STANAG

4205, as specified in the equipment specification.

5.2.1.9.6 Tactical Digital Information Link (TADIL) A Applications. Radio equipment designed for use in TADIL A applications shall comply with the applicable requirements of MIL-STD-

188-203-1, as specified in the equipment specification.

5.2.1.9.7 Tactical Digital Information Link (TADIL) C Applications. Radio equipment designed for use in TADIL C applications shall comply with the applicable requirements of MIL-STD-

188-203-3, as specified in the equipment specification.

5.2.1.9.8 Electrical Characteristics of a Digital Interface. Radio equipment that is equipped with a digital interface shall comply with the applicable "requirements set forth in the current edition of MIL-STD-188-114, as specified in the equipment specification.

5.2.1.9.9 Characteristics of a Standard IF Interface. For radios having digital modes, and providing an intermediate frequency (IF) transmit and receive interface to an external mode, the interface shall have the following characteristic:

a. Nominal IF center frequency: 70 MHz b. Impedance: 50 ohms

c. Transmit Level (Keyed) 0 dBm, ± ldB.

5.2.1.10 Envelope Delay. The absolute envelope delay for the transmitter and the receiver over the frequency band from 300 Hz to 3500 Hz shall not exceed 2.5 milliseconds (ms).

5.2.1.1.1 Equipment Time Delays. The maximum time delay measured between the input and output of the transmitter and receiver for any single frequency between 300 Hz and 3500 Hz shall be less than 2.5 ms.

5.2.1.12 Peak Deviation. The FM peak deviation shall be 5 kHz ( � 1 kHz) for narrowband and 20 kHz (± 5 kHz) for wideband.

5.2.2 Transmitter Characteristics.

5.2.2.1 Occupied Bandwidth. Ninety-nine percent of the mean radiated power shall be contained within a bandwidth of 25kHz for narrowband operation and 70 kHz for wideband operation.

5.2.2.2 Time Delays. The time delays shall not exceed the following:

a. Transmitter attack time delay 25 ms maximum b. Transmitter release time delay 10 ms maximum c. Transmit-after-receive time delay 70 ms maximum