TKM MX170C User manual

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MX170C NAV-COMM OWNER'S MANUAL
TKM, INC
14811 NORTH 73rd STREET
SCOTTSDALE, AZ 85260
PART# MN0170C, REV. 1
NOV 17,2008

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I. INTRODUCTION
This manual contains information on the TKM MX170(C), manufactured by TKM, Inc.
The information includes installation, operation, mechanical and electrical descriptions
and alignment and test considerations. The MX170(C) is authorized by the Federal
Aviation Administration to TSO C34e, C36e, C37d, C38d, C40c, and has met the test
requirements of RTCAlDO-160C.
A. Purpose of Equipment
The equipment is a 760 channel communication (COMM) transceiver for use in aviation
services and a 200 channel navigation (NAV) receiver to provide VOR / LOC signals to
navigational converters. The NAV receiver also provides frequency selection for remote
mounted Distance Measuring Equipment and Glide slope Receivers.
The MX170(C) is designed to be a direct replacement for the King KX170/ KX175.
The unit is dimensionally identical to the King units and can therefore use existing
aircraft installations. Except for improved performance characteristics, the unit is
electrically interchangeable with the King units and will provide the proper audio,
navigation and channeling signals for existing installations. New installations can
be made using KX170A installation kits.
B. 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
indicated in the standby display, it may be placed into the active position by depressing
the 'Flip-flop' button located left of the displays. The active channel is then placed into
the standby position.
The NAV receiver features a VC-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 that overrides the squelch to verify
proper receiver operation and to allow reception of weak signals. Also provided on the
active COMM display is a 'tic' to indicate transmitter power output.
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Power switches are incorporated with the NAV and COMM volume controls. The
COMM is the master power switch and the NAV provides power switching for remote
navigation units.

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The MX170(C) is comprised of eight replaceable subassemblies. Five of the
subassemblies are contained in shielded modules in order to reduce radio frequency
interference. The five are the NA V receiver, the NA V synthesizer, the COMM
receiver, the COMM synthesizer, and the Transmitter.
The remaining three subassemblies are the Rear Panel Assembly, the Front Panel
Assembly and the Computer Board. The Rear Panel Assembly contains the Audio
Amplifier, Power Filter, and the T/R switching. The Front Panel Assembly contains the
digital displays, the function select switches and the volume controls. The Computer
Board contains the microprocessor, the memory, and program storage.
Also contained on the computer board are the audio processing circuits and
the channeling circuits.
The subassemblies are interconnected with plugs so that any module may be
replaced without the use of a soldering iron. For equipment repair it is recommended
that complete subassemblies be replaced.
As an aid to locating the defective subassembly a set of analog test points are provided.
The analog test points include the receiver tuning voltages, synthesizer control voltages,
and the AGC lines.
C. Specifications
MXI70(C) TRANSCEIVER
Mounting: Panel mounted, no shock mounting required.
Size: 6.312 x 2.600 x 14.15 inches w/ connectors
(16.03 x 6.60 x 35.94 cm)
Weight: 4.9 lbs. excluding external connector and harness.
Power Requirements: 13.75 Vdc (or v w/CONV)
NAV and COMM Recv'r 1.7A
Max COMM Total wi
Transmit (Tone) 7.1A (6.2A unmodulated)
COMM Transceiver
Crystal Controlled: 760 channel
Frequency Range: 118.00 to 136.975 MHz
Frequency Stability: + .003%. -20 to 50C

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Transmitter
VHF Power Output: 8 watts minimum, 50 ohm
Modulation: 85% capability with 90% limiting provided.
Microphone: Dynamic mike containing transistorized pre-amp
or carbon (must provide at least 120 m Vrms into
500 ohm load).
Side tone: Adjustable up to 40 mw into 500 ohm
headphones.
Duty Cycle: 1 minute on, 4 minutes off (20%)
Receiver
Sensitivity: 1.5 uv (soft) will provide a 6 db minimum signal
plus noise to noise ratio (KHz, 30% mod).
Selectivity: Typical 6 db at +1-7.5 KHz, 60 db at
+1- 17.5 KHz, 90 db at +25KHz
Spurious Responses: Down at least 70 db.
Squelch: Noise adaptive squelch with override.
AGC Characteristics: From 2 to 100.000 uV audio
output will not vary more than 1 db.
NAV Receiver
Crystal Controlled: 200 Channels
Frequency Range: 108.00 to 117.95 MHz
Sensitivity: 1.5 uv (soft) will provide a half flag indication.
Selectivity: Typical 6 db at +1- 15 KHz 60 db at
+1- 35 KHz, 80db at + 50 KHz
Spurious Responses: Down at least 70 db.

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Ident Filter: 15 db minimum
AGC Characteristics: From 26 to 100.000 uV audio output will not
vary more than 1 db.
NAV Receiver Accuracy: Two sigma limit, +1- 1 degree
NA V Output: With LOC adjusted for 0.35 Vrms VOR = 0.5
Vrms (Typical) into 20K ohms or greater load
impedance.
DME Channeling
M0
M1
M2#
M3
##
K0
K1#
K2
K3#
##
50#
KHz#
##
##
##
##
##
##
##
##
##
108
-
-
0
-
.0X
0
0
-
-
.XO
-
109
-
-
-
0
.1X
0
0
0
-
.X5
0
110
0
-
-#
-
.2X
0
0
0
0
##
##
111
0
-
-#
-
.3X
-
0
0
0
##
##
112
0
0
0#
-
.4X
-
-
0
0
##
113
-
0
0
0
.5X
0
-
-
0#
##
##
114
0
-
0
0
.6X
-
0
-
-
##
##
115
-
0
-
-
.7X
-
-
0
-
##
##
116
0
-
0
-
.8X
-
-
-
0
##
##
117
0
0
-
0
.9X
0
-
-
-
##
##
NOTE: (-) = OPEN, (0) = GROUND
ILS Energize: OPEN for VOR, GROUND for ILS

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GS
GS
GS#
GS
##
##
GS#
GS
GS#
GS#
GS#
108
109
110#
111#
##
##
0.1#
0.3#
0.5#
0.7#
0.9#
108
0
-
-
-
.0X
##
-
-
-
-
-
109
-
0
-
-
.1X
##
1
-
-
-
-
110
-
-
0#
-
.2X
##
-
-
-
-#
-#
111
-
-
-#
0
.3X
##
-
1
-
-#
-#
112
-
-
-#
-
.4X
##
-
-
-
-
-#
113
-
-
-
-
.5X
##
-
-
1#
-#
-#
114
-
-
-
-
.6X
##
-
-
-
-#
-#
115
-
-
-
-
.7X
##
-
-
-
1#
-#
116
-
-
-
-
.8X
##
-
-
-
-#
-#
117
-
-
-
-
.9X
##
-
-
-
-#
1#
NOTE: (-) = OPEN, (0) = GROUND, (1) = CONNECTED TO GIS
Switching Line
Audio
Auxiliary Audio Inputs: Three (3) 500 ohms with 30 db
isolation between any two.
Frequency Responses: Within 6 db from 350 Hz to 2500 Hz
Headphone Output: 50 mw into 500 ohm
Speaker Output: 4.5 Vrms into auxiliary input produces 5 watts
audio output

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II. INSTALLATION
The MX170C is designed to be an exact replacement for the KING KX170A and similar
units. As a replacement unit, the MX is inserted directly into the mounting tray for the
KX170A and tightened down with an allen wrench (9/64).
For new installations, the installation instructions for the KX170A should be used.
Equipment removal is accomplished by rotating the clamp screw counterclockwise a
few turns until it can be felt that the clamp screw is disengaged. Excessive torque on the
clamp screw will result disassembly of the clamp. After the clamp has been disengaged
the unit may be extracted by rocking the unit from side to side. The knobs should not be
used as extraction handles. A King Extraction tool # 071-6045-00 is also an acceptable
extraction device. Another method for extraction of a tight unit would be to rotate the
clamp screw counterclockwise until significant resistance is noted, the clamp screw can
then be pulled forward to expose the screw head. Grasp the screw head with a suitable
device and extraction force can be applied. Excessive side to side motion should not be
applied to the clamp screw.
**** NOTICE TO INSTALLER ****
The TKM MX170C 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 MX170C must be installed to configure in conjunction with a
TSO C37/C38 authorized antenna and a TSO C34e authorized navigation receiver. It
is the responsibility of the installer to ensure proper installation.
****CONTINUED AIRWORTHINESS (HBA 98-18)****
Permission is hereby given to installers approved by the recognized aviation authority to
reference excerpts from the installation instructions provided by TKM Inc. in order to
fulfill documentation requirements for Instructions for Continued Airworthiness (lCA).
Adequacy of the documents should not be assumed by this permission. ICA
documentation rests solely with the ICA applicant. The MX170C product is 'Repair on
Condition Only'.

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MXI70(B/C) INTERCONNECT
The following table lists the pin description for the MX170C external interconnect:
Pin # Description Pin # Description
1 NAV A+ 22 DMEMO
2 GS+ 23 DMEM1
3 VORILOC Signal 24 DME M2
4 ILS ENABLE 25 DME M3
5 50 KHz GS 26 NAV A+ Switched
6 0.1 MHz GS 27 DME KO
7 0.3 MHz GS 28 DME K1
8 0.5 MHz GS 29 DME K2
9 0.7 MHz GS 30 DME K3
10 0.9 MHz GS 31 DME 50 KHz
11 108 MHz GS 32 DME Common
12 109 MHz GS 33 VOR Test
13 110 MHz GS 34 Phones, Comm
14 111 MHz GS 35 NAV Audio
15 Aux Audio -1 36 Aux Audio -1
16 Aux Audio -4 37 ICS
17 A I C Power Switched 38 Not Used
18 13.5 vdc Input 39 Mic Audio
19 Ground 40 Mic Key
20 A I C Power 41 Speaker
21 Power Speaker Ground 42 COMM FLIP-FLOP*
• Requires addition of internal resistor R53 on computer board.

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III. OPERATING THE MX170C
Operating controls for the MX170(C) are located on the unit front panel or through
three access points in the case (See Figure 2)
The unit front panel is shown in Figure 1. The left-hand COMM (yellow) readout
indicates the active COMM frequency and the right hand COMM (red) readout indicates
the standby COMM frequency. The left-hand NAV (yellow) readout indicates the active
NA V frequency and the right hand NA V (red) readout indicates the standby NA V
frequency. A 'tic' readout is provided on the upper 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 frequency.
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
activates the COMM functions. The NA V volume control contains a power switch for
the remote NA V units. In order to activate all COMM and NA V functions, both
volume controls must be turned on.
Frequency Selection. The N/C button is used to activate either the COMM or the NA
V frequency 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 '25' button
is used to advance the frequency by 25 KHz.
After the desired standby frequency is selected, it may be transferred to the active
position by pressing the desired 'flip-flop' buttons left of the displays. The active and
standby channels will be transposed each time the button is pressed.
Ident/Voice Selection. The VC-ID button can be used to select a tone filter in order to
receive voice signals on the NAV receiver. The switch is also used for frequency storage
as described in Frequency Storage.
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.

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T
Transmit. The transmit mode on the transceiver is selected by grounding the MIC Key
line on the unit's rear panel.
Clearing all frequency presets. To clear the entire memory, both NAV and COMM,
except for factory presets:
1. Turn radio off.
2. While holding down the TEST button, turn the radio on. The unit will reset to factory
preset default channels in both active and standby (COMM 121.50/120.00) (NAV
108.001112.00).
Frequency Storage. The MX170C 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 procedures.
Examining / Changing / Inserting / Deleting frequency presets. These operations on
individual frequency presets are accomplished in EDIT mode. To enter EDIT mode, turn
on the power to the radio while holding the VT button depressed. When the radio is in
EDIT mode, the active displays show the sequential number of the preset (1,2,3,etc.) and
the standby displays show the actual preset frequency.
EDIT mode operations can be performed on either the COMM or NA V preset list,
according to where the tuning tic indicator is displayed. The tuning tic appears
immediately to the left of the COMM or NA V standby displays. Pressing the N-C
button toggles between NA V and COMM preset editing.
Examining presets (EDIT MODE). Pressing the COMM F-F button will step to the next
frequency in the preset list. Pressing the TEST button will step to the previous frequency
in the preset list. Pressing COMM F -F when the last preset is displayed will cause the
first preset to display. Similarly, pressing TEST when the first preset is displayed will
cause the last preset to display. Warning: When there is only one preset in the list, the
radio will not appear to "do anything" when the COMM F-F or TEST is pressed. This is
because the current, previous, and next presets are all the same preset.
Changing a preset (EDIT MODE). Press COMM F-F or TEST until the preset to be
changed is displayed. Dial in the new preset frequency using the tuning controls and
press either COMM F-F or TEST.
Inserting (Adding) a preset (EDIT MODE). Press COMM F-F or TEST until the desired
insert point is displayed (the new preset will be inserted AFTER this insert point). Dial
in the desired frequency using the tuning controls and press NAV F-F. Remember that a
preset list may contain a maximum of 50 entries. Inserting commands that would cause
this limit to be exceeded are ignored.

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Deleting a preset (EDIT MODE). Press COMM F-F or TEST until the preset to be
deleted is displayed. Then press the VC - ID switch to delete. If the deleted preset was
not at the end of the list, all the presets that followed it are renumbered. Each preset list
(NAV and COMM) must always contain at least one entry. If there is only one entry
remaining in a preset list, it may not be deleted (It can be changed to another frequency).
Frequency preset, normal operation. At any time the radio is in normal operation (Not
EDIT MODE), COMM preset frequencies may be called into the standby frequency
display by pressing COMM F-F while the TEST button is depressed. During the time
that both buttons are held simultaneously depressed, the reference number for the
preset appears in the active window. Each time this operation is repeated, it will copy
the "next" preset to the COMM standby frequency.
NAV preset operation is similar, with the exception that presets are retrieved by
pressing and holding the NAV F-F while pressing the VC - ID.
MX170C FRONT PANEL

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IV. EQUIPMENT LIMITATIONS
The following limitations indicate where the MX170C may be installed and meet
the applicable TSO requirements.
1. Equipment is intended for installation within a non-pressurized but controlled
temperature location 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 Turboprop Engines.
4. Equipment shall not be mounted less than 0.3 m from magnetic compass.
5. Unit has not been tested with autopilots
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MX170(B/C) QUICK OPERATION GUIDE
Controls & Indicators
Control Use - Normal Use - Edit
Top Left f-~ Flips Active and Standby Next preset
COMM F-F COMM frequencies
TEST Squelch Previous preset
Lower Left f-~ Flips Active and Standby Insert preset
NA V F-F NA V frequencies
VC-ID NAV Voice filter Delete preset
COMM Displays Left is Active Right is Standby
(Note: Tic to upper left of
121.50)
Upper VOL knob Power off/on, COMM volume
NAV Displays Left is Active Right is Standby
Lower VOL knob NA V power off/on, NA V volume
25 Adds 25 KHz to Standby COMM frequency
N-C Toggle selection knobs between Standby NA V and COMM
VT Select edit mode on power up
MHz knob Alter MHz setting on Standby display with Tic
KHz knob Alter KHz setting on Standby display with Tic
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V. ENVIRONMENTAL QUALIFICATION FORM
Model MX170C NA V I COMM as specified in MX170C Specifications manufactured
by TKM, Inc., 14811 NORTH 73rd STREET, SCOTTSDALE, AZ 85260.
CONDITIONS D0160C 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 S (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 A
Power Input 16.0 Category B
Voltage Spike Condo 17.0 Category B
Audio Spike Suscept. 18.0 Category B
Induced Sig. Suscept. 19.0 Category B
RF Susceptibility 20.0 Category B

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RF Emission 21.0 Category B
Installation Instructions: The MX170C is designed to be a slide in replacement for ARC
radios and, as such, shall be installed with all of the original equipment precautions.
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