User guide

MS-DMT Guide v1.04
Released 05-30-2014
134
APPENDIX H: STANAG 4203
STANAG 4203, “Technical standards for single channel HF radio equipment”, in summary
specifies properties of the radio which receives the audio signal (3 kHz bandwidth) from the
modem and modulates it onto the PSK carrier. STANAG 4203 contains the minimum
interoperability standards for single channel HF radio equipment. It does not contain
performance specifications. For performance specifications reference should be made to other
standards such as MIL-STD-188-141C, Section 5.
Technical parameters specified in STANAG 4203 Edition 3 are:
 Radio frequency range
 Tuning
 Frequency accuracy and stability
 Frequency response and group delay time over a 3 kHz frequency band
 Phase noise
 Linearity
 Random emissions outside the frequency band and inter modulation products
 Operation mode (simplex/half-duplex)
 Switching time between transmitting and receiving
 Gain control
 Modulation of carrier wave
S4203 in particular specifies:
The base-band frequency response of the transmitter and of the receiver over the range 300Hz
to 3050Hz shall be within ±2dB of the response at 1000Hz for manpack equipment and within
±1.5dB for all other equipment. The group delay shall not vary by more than 0.5 ms over 80% of
the pass-band of 300Hz to 3050Hz. The maximum time delay measured between the input and
the output of either the transmitter or the receiver shall be less than 10 ms (design objective
5ms) over this pass-band.