Northern Airborne Technology NTX403 - Manual (Page 10)

NTX403 Series Remote Mount UHF-FM Transceiver Manual SM64 Rev. 4.00
Output Signals
Headset Audio 100 mW Nominal, 250 mW max into 600 Ω
AUX Receive Audio 300 mVrms nominal, not tone controlled
RT Installed Low Output (Ground)
Main SQ Disable Out Active low output, open collector (20 mA max)
Serial Data Out RS-422 data to control head
Bi-directional Signals
RF Input / Output 50 Ω nominal antenna impedance
1.4.2 General Specifications
Frequency Range 403.000 to 511.99375 MHz
RF Impedance 50 Ω nominal
Modulation FM
Rated System Deviation 2.5 kHz (Narrowband), 5 kHz (Wideband)
Rated Audio Input Level 100 mVrms nominal
Duty Cycle 20% (1 min. TX, 4 min. RX)
Sub-audible Tones 38 standard CTCSS tones and all DCS codes
Remote Interface RS-422 serial data
Number of channels 128, simplex or semi-duplex
Channel Increments 6.25 / 10 kHz
Scan Rate 10-20 channels/sec. All channels may be in
scan list.
1.4.2.1 Transmitter
RF Output Power 10 W or 1 W ± 1dB
Frequency Stability ±2.5 ppm
Conducted Spurious ≤-13 dBm (50 µW)
Adjacent Channel Power ≥54 dBc (Narrowband), ≥70 dBc (Wideband)
Modulation Limiting 2.5 kHz (Narrowband), 5 kHz (Wideband)
Microphone Impedance 150 Ω ±20%
AF Characteristic -6 dB/octave +1/-3 dB pre-emphasis (EIA STD)
Page 1-2 Apr 19, 2005
ENG-FORM: 800-0107.DOT
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