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TKM MX385 Instruction Manual

Nav/comm transceiver
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PART # IMN385, REV. 5
JULY 29, 2008
INSTRUCTION MANUAL
FOR
MX385 NAV/COMM TRANSCEIVER
11/16/98
1/15/02
3
4
TKM, INC
14811 N. 73
SCOTTSDALE, AZ 85260
07/29/08
5
RD
STREET
1

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  • Page 1 INSTRUCTION MANUAL MX385 NAV/COMM TRANSCEIVER 11/16/98 1/15/02 07/29/08 TKM, INC 14811 N. 73 STREET SCOTTSDALE, AZ 85260 PART # IMN385, REV. 5 JULY 29, 2008...

  • Page 2: Table Of Contents

    III. HOW TO OPERATE IV. THEORY OF OPERATION V. ALIGNMENT AND TEST SPECIFICATIONS VI. MECHANICAL DISASSEMBLY VII. TEST PROCEDURES VII. SCHEMATICS, LAYOUTS AND PART LISTS MX385 Interconnect (J1) MX385 Interconnect (J2) IDENTURED LIST OF DRAWINGS Top Assembly Computer Front Panel...

  • Page 3: Introduction

    The NAV receiver also provides frequency selection for remote mounted Distance Measuring Equipment and Glideslope Receivers. The MX385 is designed to be used as a direct replacement for the Cessna/ARC RT385A. The unit is dimensionally identical to the ARC units and can therefore use existing aircraft installations.
  • Page 4 The adjustment hole (S) by the KHz switch permits operator adjustment of the squelch threshold. The MX385 is comprised of eight replaceable subassemblies; five of the subassemblies are contained in shielded modules to reduce radio frequency interference. The five modules are the NAV receiver, the NAV synthesizer, the COMM receiver, the COMM synthesizer, and the Transmitter.

  • Page 5: Specifications

    C. SPECIFICATIONS MX385 TRANSCEIVER Mounting: Panel mounted, no shock mounting required. Size: 6.312 x 2.50 x 11.1 inches w/ connectors but excluding knobs. Weight: 6.0 lbs excluding external connector and harness. Power Requirements: 27.5 Vdc at 0.7 Amp Max COMM Total w/ Transmit (Tone) 3.0 Amp...
  • Page 6 RECEIVER Sensitivity: 1.5 uv (soft) will provide a 6 db minimum signal plus noise ratio (KHz, 30% mod). Selectivity: Typical 6 db at +/- 7.5 KHz, 65 db at +/- 17.5 KHz, 90 db at +/- 25 KHz. Spurious Responses: Down at least 70 db Ident Filter: 15 db minimum...

  • Page 7: Installation

    NOTICE TO INSTALLER The TKM MX385 NAV/COMM is authorized by the FAA to TSO C34e, C36e, C37d, C38d, and C40c. The product is an incomplete system. In order to achieve a complete TSO quality system, the MX385 must be installed to configure in conjunction a TSO C37/C38 authorized antenna and a TSO C34 authorized navigation receiver.

  • Page 8: How To Operate

    III. HOW TO OPERATE Operating controls for the MX385 are located on the unit front panel or are remote inputs through the rear panel. The unit front panel is shown in fig. 1. The upper left-hand (yellow) COMM readout indicates the active COMM frequency and the right-hand (red) COMM readout indicates standby COMM frequency.
  • Page 9 Frequency Storage. The MX385 NAV COMM allows up to 50 NAV and 50 COMM preset frequencies to be stored in the memory for recall. The use of memory presets is described in the following sections. Clearing all frequency presets. To erase all frequency presets with one operation, simply turn on the power to the radio while holding the TEST button depressed.

  • Page 11: Theory Of Operation

    IV. Theory of Operation For ease of service the MX385 has been designed into 8 replaceable modules. The modules are: A. Front Panel Assembly B. Rear Panel Assembly C. Computer Board D. NAV Receiver E. COMM Receiver F. NAV Synthesizer G.
  • Page 12 antenna. In transmit, the T/R line is open circuited to permit the transmitter signal to generate a reverse bias on the diode to the peak value of the transmit signal. C. Computer Board (Dwg. SS1967) The computer board contains 3 basic sections: 1.
  • Page 13 2. Using a Spectrum Analyzer with a tracking generator align RF filters to have a symmetrical response centered at 136.9 MHz when NAV/COMM unit is tuned to 136.9 MHz. Peak gain shall be 15 +/- 1.5 DB when output is measured at mixer input. 3.

  • Page 14: Alignment And Test Specifications

    V. Alignment and Test Specifications Adjustments are made on the complete unit during final test basis and upon installation basis. Installation adjustments are accessible without removing the cover and include a side tone level adjustment, a microphone gain adjustment, and an audio gain adjustment. Other adjustments which are not normally adjusted on installation but may require adjustment different from factory set levels include the squelch level, the dimmer and the NAV demod level.
  • Page 15 5. DMD Level (R25). With conditions the same as in IF Alignment apply a standard centered LOC modulation and adjust R25 for .35 Vrms on DMD output. E. COMM Receiver (Dwg. SS1866) 1. Apply +15 vdc and –30 vdc to appropriate input leads, set local oscillator signal to 3 +/-2 dbm and a 1 to 15 vdc variable voltage source to Vt.

  • Page 16: Mechanical Disassembly

    System Alignment When all modules are aligned and assembled into a system, it is necessary to make receiver tracking, VOR/LOC converter and squelch adjustments. COMM receiver tracking is accomplished by selecting 118.00 MHz as the active channel, applying a 10 uV RF input signal at 118.00 MHz, and adjusting R49 on the Computer board for minimum reading on COMM AGC line.

  • Page 17: Test Procedures

    SECTION VII TEST PROCEDURES...

  • Page 27: Schematics, Layouts And Part Lists

    SCHEMATICS, LAYOUTS AND PARTS LISTS MX385 Interconnect The following table lists the pin description for the MX385 interconnect. Pin # Description Pin # Description Phn sidetone in Phn sidetone out Isol. Audio input Speaker Spare Speaker Aux audio input Mic key...
  • Page 28 Description Pin # Computer Board Pin # DME Common DME 1 MHz A DME 1 MHz B DME 1 MHz C DME 1 MHz D DME 1 MHz E DME 100 KHz A DME 100 KHz B DME 100 KHz C DME 100 KHz D DME 100 KHz E DME 50 KHz...

  • Page 29: T/R Switch

    INDENTURED DRAWING LIST MODEL MX385 AT1900 REV 1 MX385 TOP ASSEMBLY SM1901 REV 4 CASE; MX385 SM1902 REV 1 COVER; MX385 HM1906 REV 1 CASE GUIDE; MX385 HM1904 REV 2 HOOD, COAX; MX385 HM1905 REV 1 CONNECTOR MNT; MX385 HM1912 REV 2 BLOCK, TX, REAR;...

  • Page 30: Comm Receiver

    SS1866 REV C RECEIVER ASSY; COMM (GREEN) PC 1866 REV C PCB, RECEIVER SM1840 REV 3 CASE, MODULE SM1841 REV 3 COVER, MODULE SM1 812 REV 2 GND BRACKET; RX CA1803 NONE CABLE ASSY, COAX CA1866 NONE CABLE, COMM RECEIVER CA1804 REV 1 CABLE ASSY, COAX LFST4N NONE...

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