TKM MX170B Instruction Manual

TKM, Inc MX170B NAV/COMM
3/20/06 1/3
MX170B Operation
Controls & Indicators
Control
Use – Normal
Use – Edit
Top Left 
COMM F-F
Flips Active and Standby
COMM frequencies
Next preset
TEST
Squelch
Previous preset
Lower Left 
NAV F-F
Flips Active and Standby
NAV frequencies
Insert preset
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
NAV power off/on, NAV
volume
25
Adds 25 KHz to Standby
COMM frequency
N-C
Toggle selection knobs
between Standby NAV 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

TKM, Inc MX170B NAV/COMM
3/20/06 2/3
Basic Operation
Refer to the photo for placement of the controls and displays.
The left hand COMM readout indicates the active COMM frequency; the right hand
readout indicates the standby one.
The left hand NAV readout indicates the active NAV frequency; the right hand readout
indicates the standby one.
A “Tic” readout is provided on the upper left hand corner of the first digit of each of the
four frequency readouts. The meaning of each Tic is –
Position
Indication
Active COMM
Transmitting
Standby COMM
Selection knobs control COMM standby frequency
Active NAV
NAV is in Ident mode
Standby NAV
Selection knobs control NAV standby frequency
Note that the standby Tics are, therefore, mutually exclusive. The Tic indicates which
frequency may be altered.
Power Application. The COMM volume control contains the master power switch and
activates both COMM and NAV functions. Power off is fully counter-clockwise. The
NAV volume control contains a power switch for remote NAV units.
Frequency Selection. The N-C button toggles between COMM or NAV standby
frequency selection. The frequency under control is indicated by the Tic. The MHz and
KHz controls can then be used to select a desired standby channel. When selecting a
standby COMM frequency, the 25 button is used to advance the frequency by 25 KHz.
After the desired frequency is entered into the standby position, it may be transferred to
the active position by pressing the flip-flop button between the two displays. Active and
standby will be interchanged each time the button is pressed.
Ident/Voice Selection. The VC-ID button can be used to select a filter in order to receive
voice signals on the NAV receiver. Its status is indicated by the Active NAV Tic. This
switch is also used for frequency storage (see below).
Test. The TEST button is a dual function switch. In normal operation, it is used to
override the squelch. This will verify receiver operation. It will also allow the reception
of weak signals. It is also used in frequency storage (see below).

TKM, Inc MX170B NAV/COMM
3/20/06 3/3
Transmit. The transmit mode on the COMM transceiver is selected by grounding the
Mic Key line to the unit. This is achieved by pressing the PTT button on either the pilot
or co-pilot yoke, the PTT button on a hand-held microphone, or the PTT button on a
connected remote intercom.
Advanced Operation
The MX170B allows up to 50 NAV and 50 COMM frequencies to be stored in memory
for recall. These preset frequencies remain in memory after the unit is powered down.
Clear Presets. To erase all frequency presets, turn on power to the unit while depressing
the TEST button. Once reset, both COMM Active and Standby frequencies will be set to
121.5 MHz. NAV will be set to 112.0 MHz.
EDIT Mode. To enter EDIT mode, power up the unit while depressing the VT button.
When in this mode, frequency presets may be examined, changed, inserted, or deleted.
EDIT mode operations are performed on either the COMM or NAV preset list, according
to where the tuning Tic is displayed. Pressing the N-C button toggles between the NAV
and COMM positions.
Examine Presets. Pressing the COMM F-F button will step to the next frequency in
the preset list. The list wraps round so that the next frequency after the last one is the
first one. Pressing TEST will step to the previous frequency in the list.
Change Presets. Display the frequency to be changed. Dial in the new frequency
using the selection knobs. Press either COMM F-F or TEST.
Insert Presets. Step to the frequency before the point at which the new one should be
inserted. Dial in the new frequency. Press NAV F-F.
Delete Presets. Step to the frequency to be deleted. Press VC-ID to remove this
frequency from the list. If there is only 1 frequency in the list, it will not be deleted.
Use Presets - COMM. When in normal operation, COMM presets can be called into the
standby display by pressing COMM F-F and TEST together. While the buttons are
pressed, the reference number is displayed in the Active frequency display. Each time the
two buttons are pressed, the next preset in the list will be loaded into Standby.
Use Presets – NAV. NAV preset operation is similar to COMM, Presets are loaded into
NAV standby by pressing NAV F-F and VC-ID together.