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. DETAILED REQUIREMENTS

5.1 Introduction. This section provides detailed performance standards for tactical single channel

UHF radio communications equipment.

5.2 Tactical Single Channel UHF Radio Communications Equipment. These parameters apply to all operational modes unless otherwise specified.

5.2.1 Common RF Characteristics. These  radio frequency (RF) parameters shall apply to both transmitters and receivers unless otherwise specified.

5.2.1.1  Equipment  Operational  Modes.  This  standard  specifies  requirements  for  equipment designed to operate in narrowband and wideband amplitude modulation (AM), narrowband and wideband  frequency  modulated  (FM),  continuous  wave  (CW),  and  phase  shift  keying  (PSK) modes. These requirements do not preclude the use of operational modes not addressed herein. The following diagram illustrates the relationship of the typical modes employed in UHF single channel tactical radios subject to this standard.

Modes of Operation:                               LOS                                              SATCOM

Modes of Application:                Morse               Analog Voice           Digital Voice & Data

Modes of Modulation:                  CW                AM             FM         PSK              FM(FSK)

5.2.1.2 Frequency Coverage. The radio equipment shall tune to any integral multiple of 25 kHz within the frequency range of 225.000 MHz to 399.975 MHz.

NOTE: This requirement does not preclude tuning in integral subdivisions of 25 kHz.

5.2.1.3 Displayed Frequency. The displayed frequency shall be the same as the carrier frequency, whether suppressed or not.

5.2.1.4  Assigned  Frequency.  The  assigned  frequency  shall  be  in  the  center  of  the  occupied bandwidth.

5.2.1.5 Frequency Stability. The radio equipment shall maintain frequency stability with respect to the initial frequency, to within 1.0 parts per million (ppm) (DO 0.1 ppm) per day, 2.0 ppm

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