MX300 NAV - COMM OWNER`S MANUAL
Contents
1. holding TEST while pressing the flip flop button When a frequency is inserted into memory the next available frequency 15 taken from memory and placed into standby If no frequen cies are in memory the standby will indicate 10000 A NAV frequency selected in the standby display may be transferred to memory by pressing and holding VC ID while press ing the NAV flip flop button When 10000 is present in the standby display a new channel can be selected and placed into memory in the manner previously described In the group of frequencies stored in memory there will always be one and only one 10000 At the upper or lower end of the NAV or COMM frequency ranges a 10000 display will be available To delete a channel from mem ory 1t must be sequenced to the standby display and set to 10000 by the frequency selector switches transferring of the 10000 to storage will then eliminate the undesired frequency Transmit The transmit mode on the transceiver is selected by pressing the transmit button on the microphone Channel Reset If it is desired to clear memory a system reset may be accomplished by turn ing off the main power switch pressing and holding TEST button and then turning on the main power switch after reset the COMM Active will read 121 5 and the COMM standby will read 120 0 The Nav Active will read 108 0 NAV standby 112 0 VOR OBS Adjustment OBS test can be made by tuning in a solid VOR station and depress ing the VOR button T2. shall not be mounted less than 0 3 m from magnetic compass 5 Unit has not been tested with autopilots ASSOCIATED EQUIPMENT The MX300 is designed to be used as a direct replacement for the Cessna ARC RT328T The unit is dimensionally identical to the ARC units and can therefore use existing aircraft installa tions Except for improved performance characteristics the unit is electrically interchangeable with the ARC unit and will provide the proper audio navigation signal and channeling signals for existing installations New installations can be made using RT 328T installation kits which are available as an optional accessory Additionally the MX300 will directly replace the following NAV COMM S RT308C RT328A RT328C RT328D RT508A RT528A RT528E The RT308C RT328A and RT528A use pin L of J3 instead of pin BB of J4 to output the NA V demod signal The MX300 may be ordered with the different output pin or may be modified in the field An optional adapter is available which permits the replacement of the following NAV COMM S RT517 RT514R RT540 5158 RTS15A 1 The MX300 will interface directly with the ARC IN525A Course Deviation Indicator and simi lar units The remote channeling outputs of the unit permit channeling of Glide Slope receivers and DME using the ARINC 2 out of 5 channeling system INSTALLATION The MX300 is designed to be an exact replacement for the ARC RT328T and similar units As a replacement unit the
3. MX300 NAV COMM OWNER S MANUAL TKM INC 14811 NORTH 73 STREET SCOTTSDALE AZ 85260 PART MNO300 REV 3 NOV 16 1998 EQUIPMENT DESCRIPTION The unit features digital LED displays for active yellow frequency channel and standby red frequency channel for both COMM and NAV For channel selection a MHz knob and a KHz knob are provided For 25 KHz increments in COMM a 25 KHz button is provided To activate COMM or NAV frequency selection an N C button is provided a tic appears in the selected standby channel display Channel selection operates on the standby channel only When the desired channel is indi cated in the standby display it may be placed into the active position by depressing the Flip flop button located to the left of the displays labeled COMM and NA V the active channel is then placed into the standby position The NAV receiver features a AC ID button to permit selection of voice or ident reception In the Ident condition a tic is displayed on the active NAV channel display The COMM transceiver features a test button which overrides the squelch to verify proper receiver operation and to allow reception of weak signals Also provided on the active COMM display 15 a tic to indicate transmitter power output A VOR test button 15 provided on the front panel to inject a 0 degree FROM bearing into the Navigation converter circuits when a solid VOR signal is being received a bearing adjust ment can then
4. MX300 is inserted directly into the mounting tray for the RT328T and tightened down with a small 125 dia max Phillips head screwdriver For new installations the Installation instructions for the RT328T should be used To remove the MX300 from the mounting tray it is important to note that the Channel Selec tor knobs should not be used The first step in removal is to ensure that the mounting clamp has been fully disengaged by rotating the clamp screw counterclockwise with the tool de scribed above it should be noted that the clamp screw is a holding device and not an extrac tion device The unit may then be pryed from the tray with a thin flat bladed screwdriver when access to the front corners has been made available OPERATING INSTRUCTIONS Operating controls for the MX300 are located on the unit front panel or are remote inputs thru the rear panel The unit front panel is shown in figure 1 The left hand COMM readout indicates the active COMM frequency and the right hand COMM readout indicates the standby COMM fre quency The left hand NAV readout indicates the active NAV frequency and the right hand NAV readout indicates the standby NAV frequency A tic readout is provided on the up per left hand corner of the first digit of each of the four frequency readouts The active COMM Tic indicates the presence of transmitter power The standby COMM Tic indicates that the Frequency Selection knobs will control COMM standby frequ
5. be made through the adjustment hole by the KHz switch The adjustment hole by the MHz switch permits operator adjustment of the display dimmer range for optimum nighttime brightness The tic is the upper half of 1 and is found to the left of the 100 s digit SPECIFICATIONS Mounting Size Weight Power Requirements NAV and COMM Recv r Max COMM Total w Transmit Tone Crystal Controlled Frequency Range Frequency Stability VHF Power Output Modulation Microphone Sidetone Duty Cycle Sensitivity Selectivity Spurious Responses COMM Transceiver Transmitter Receiver Panel mounted no shock mounting required 6 312 x 3 120 x 12 15 inches w connectors 6 0 Ibs excluding external connector and har ness 13 75 Vdc or 27 5 v w CONV 1 8A 7 1A 6 2A unmodulated 760 Channel 118 00 to 136 975 MHz 003 20 to 50C 8 watts minimum 50 ohm 85 capability with 90 limiting Dynamic mike containing transistorized pre amp or carbon must provide at least 120 mV rms into 500 ohm load Adjustable up to 40 mw into 500 ohm head phones 1 minute on 4 minutes off 20 1 5 uv soft will provide a 6 db minimum signal plus noise ratio KHz 30 mod Typical 6 db at 7 5 KHz 65 db at 17 5 KHz 90 db at 25 KHz Down at least 70 db Squelch AGC Characteristics Crystal Controlled Frequency Range Sensitivity Selectivity Spurious Res
6. ency The active NAV Tic indicates that the NAV receiver is in the Ident Mode The standby NAV Tic indicates that the Frequency Selector knobs will control NAV standby frequency Power Application The COMM volume control contains the master power switch and acti vates both the NAV and COMM functions Frequency Selection The N C button is used to activate either the COMM or the NAV frequency 7 selection as indicated by the appropriate Tic display The MHz and KHz controls can then be used to select a desired standby channel In COMM the 112511 button is used to advance the frequency by 25 KHz After the desired standby frequency is selected 1t may be transferred to the activate position by pressing the flip flop button to the left of the ACTIVE display The active and standby channels will be interchanged each time the button is pressed Ident Voice Selection The ID VC button can be used to select a tone filter in order to re ceive voice signals on the NAV receiver The switch is also used for frequency storage as described below Test The TEST button is a dual function switch In normal operation it is used to override the squelch to verify receiver operation and to receive weak signals The switch is also used for frequency storage as described below Frequency Storage Up to 100 frequencies may be stored in the unit s memory A COMM frequency selected in the standby display may be transferred to memory by pressing and
7. he L R needle should be centered with a bearing of O degrees FROM or 180 degrees TO if an error exists the VOR bearing may be adjusted through the hole in the front panel by the KHz switch marked V Display Dimmer Adjustment The dark end of the automatic display dimmer range is adjustable through the front panel hole by the MHz switch marked D ENVIRONMENTAL QUALIFICATION FORM Model MX300 NA V COMM as specmanufactured by TKM INC 14811 North 73rd Street Scotts dale Az 85260 Conditions DO160B para Description of Test Temperature and Alt 4 0 Category C1 Low temperature 4 5 1 Category C1 High temperature 4 5 2 Category C1 Altitude 4 6 1 Category C1 Decompression 4 6 2 Not Tested Overpressure 4 6 3 Not Tested Temperature Variation 5 0 Category C Humidity 6 0 Category A Shock 7 0 Tested for all conditions Vibration 8 0 Category 5 no shock mts Explosion 9 0 X Not Tested Waterproofness 10 0 X Not Tested Fluid Susceptibility 11 0 X Not Tested Sand and Dust 12 0 X Not Tested Fungus 13 0 X Not Tested Salt Spray 14 0 X Not Tested Magnetic Effect 15 0 Category Power Input 16 0 Category B Voltage Spike Cond 17 0 Category B Audio Cond Suscept 18 0 Category B Induced Sig Suscept 19 0 Category B RF Suscepibility 20 0 Category B RF Emission 21 0 Category B Installation Instructions The MX300 is designed to be a slide in replacement for ARC radios and as such shall be installed with all of the original equipme
8. nt precautions SQUELCH OVERRIDE DIMMER ADJUST COMM MEMORY ACCESS COMM VOLUME COMM F F MASTER POWER PHOTOCELL MHZ SELECT VOICE IDENT CLAMP VOR TEST KHZ SELECT NAV MEMORY ACCESS NAV F F NAV VOLUME VOR O SET Figure 1 MX300 Front Panel
9. ponses Ident Filter AGC Characteristics NAV Receiver Accuracy NAV Output DME Channeling G S Channeling Auxiliary Audio Inputs Frequency Response Headphone Output Speaker Output NAV Receiver AUDIO Noise adaptive squelch with manual override From 2 to 100 000 uV audio output will not vary more than 1 db 200 Channels 108 00 to 117 95 MHz 1 5 uv soft will provide a half flag indica tion Typical 6 db at 15 KHz 60 db at 35 KHz 80 db at 50 KHz Down at least 70 db 15 db minimum From 2 to 100 000 uV audio output will not vary more than 1 db Two sigma limit 1 degree With LOC adjusted for 0 35 Vrms VOR 0 5 Vrms typical into 20k ohms or greater load impedance 2x5 2x5 Five 5 500 ohms with 30 db isolation be tween any two Within 6 db from 350 Hz to 2500 Hz 50 mw into 500 ohm 4 5 Vrms into auxiliary input produces 5 watts audio output EQUIPMENT LIMITATIONS The following limitations indicate where the MX300 may be installed and meet the applicable TSO requirements 1 Equipment is intended for installation within a nonpressurized But controlled temperature lo cation in an aircraft that is operated at altitudes up to 35000 feet MSL 2 Equipment is intended for use in a Standard Humidity Environment 3 Equipment is intended to be panel mounted in Single and Multi Engine Fixed Wing Aircraft with Reciprocating and Turbopropeller Engines 4 Equipment
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