Technisonic TFM-138 VHF/FM TRANSCEIVER User Manual
Technisonic Industries Limited VHF/FM TRANSCEIVER Users Manual
Contents
USER MANUA 1 OF 4
VHF/FM
AIRBORNE TRANSCEIVER
MODEL TFM-138B
(s/n’s 1500 and up with F14 Software)
Installation and
Operating Instructions
Til Document No.
97RE221
Rev. A
Issue 1
SEPTEMBER 2002
Technisonic Industries Limited
240 Traders Boulevard, Mississauga, Ontario L4Z 1W7
Tel:(905)890-2113 Fax:(905)890-5338
www.til.ca
CAUTION
This unit contains static sensitive devices. Wear a grounded wrist strap and/or conductive gloves when
handling printed circuit boards.
NOTE: This equipment has been tested and found to comply with the limits for
a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference when
the equipment is operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the user
will be required to correct the interference at his own expense.
Warning:
Changes or modifications not expressly approved by Technisonic Industries could void
the user’s authority to operate the equipment.
WARRANTY INFORMATION
The Model TFM-138B, VHF/FM Transceiver is under warranty for one year from date of purchase. Failed
units caused by defective parts, or workmanship should be returned to:
Technisonic Industries Limited
240 Traders Boulevard
Mississauga,
Ontario L4Z 1W7
Tel: (905) 890-2113 Fax: (905) 890-5338
A Page
Summary of DO-160C Environmental Testing for Technisonic Model TFM-138B, VHF Transceiver
Conditions Section Description of Conducted Tests
Temperature and Altitude 4.0 Equipment tested to categories B2 and D1.
Vibration 8.0 Equipment is tested without shock mounts
to categories B, M and N.
Magnetic Effect 15.0 Equipment is class Z.
Power Input 16.0 Equipment tested to category B.
Voltage Spike 17.0 Equipment tested to category B.
RF Emission 21.0 Equipment tested to category Z.
Installation Approval Note
Presently no TSO standard exists for airborne FM transceivers. To make it easier for installation agencies to
provide their customers with an approved installation supported by an effective Airworthiness Approval,
Technisonic has secured Supplemental Type Certificate (STC) Approvals (both US and Canadian) on its
Airborne FM products for many helicopters currently being delivered in the US and Canada as well as a
number of single engine fixed wing aircraft. The above referenced DO-160C test data is also on file and
available from Technisonic to support approval requirements in airframes for which Technisonic does not
possess an STC.
Approved aircraft types are listed in the attachments to the formal STC documents. These STC's are the
exclusive property of Technisonic and require the written authority of Technisonic for their use. To assist
Factory Authorized Technisonic Dealers in the certification process, we have placed copies of our Canadian
and US STC's on our web site along with a letter of authorization for their use. These documents may be
downloaded and used as support for the technical submission to FAA or Transport Canada. Only factory
authorized dealers/installers are permitted to download and make use of these documents on behalf of their
customers (end users) in support of regulatory agency approval. Please refer to the Technisonic web site
www.til.ca for the latest issue of available STC’s and letter of authorization for use.
B page
TABLE OF CONTENTS
Paragraph Title Page
SECTION 1 GENERAL DESCRIPTION
1.1 Introduction ............................................................. 1-1
1.2 Description ............................................................. 1-1
1.3 Purpose of Equipment .................................................... 1-1
1.4 Model Variation .......................................................... 1-1
1.5 Technical Summary...................................................... 1-2
SECTION 2 OPERATING INSTRUCTIONS
2.1 Features ............................................................... 2-1
2.2 Operating Instructions .................................................... 2-1
2.3 Programming Instructions ................................................. 2-5
2.4 Scanning Function ....................................................... 2-6
2.5 Priority and Selective Memory Channel Scanning .............................. 2-6
2.6 Direct Frequency Entry Mode .............................................. 2-6
2.7 Receive Frequency Simplex Function ........................................ 2-7
2.8 Keyboard Lockout Function . . .............................................. 2-7
2.9 Variable Frequency Mode Function ......................................... 2-7
2.10 LED Display Variable Dimming Mode ........................................ 2-7
2.11 90 Second Transmitter Time Out Feature .................................... 2-7
2.12 Quick Guard Programming Feature ......................................... 2-7
2.13 Programming CTCSS Tones .............................................. 2-8
2.14 PC Memory/Programming Download Capability ............................... 2-9
SECTION 3 INSTALLATION INSTRUCTIONS
3.1 General ................................................................ 3-1
3.2 Equipment Packing Log................................................... 3-1
3.3 Transceiver Installation ................................................... 3-1
3.4 Installation Kit - Contents .................................................. 3-1
3.5 Antenna Installation ...................................................... 3-1
3.6 Installation - Pin Locations and Connections .................................. 3-1
3.7 Wiring Instructions ....................................................... 3-3
3.7.1 Main Power +28VDC ..................................................... 3-3
3.7.2 Main Ground ............................................................ 3-3
3.7.3 PTT (Ground Keying) ..................................................... 3-3
3.7.4 Front Panel Back Lighting . . . .............................................. 3-5
3.7.5 Audio Outputs (600 and 4 Ohms) ........................................... 3-5
3.7.6 Audio Output Ground ..................................................... 3-5
3.7.7 Mic Signal Input ......................................................... 3-5
3.7.8 Memory Up/Memory Down ................................................ 3-5
3.7.9 Data Input .............................................................. 3-5
3.8 Internal Programming and Guard Enable/Disable Jumper ....................... 3-5
3.9 Transmitter Power Adjustments ............................................ 3-7
3.10 Transmitter Microphone Level Adjustment .................................... 3-7
3.11 Transmitter Sidetone Level Adjustment ...................................... 3-7
3.12 Main and Guard Squelch Adjustment ........................................ 3-9
3.13 Transmitter Deviation Adjustment ........................................... 3-9
3.14 Guard Receiver Audio Limit Feature ......................................... 3-9
i
SECTION 3 INSTALLATION INSTRUCTIONS - APPENDIX
Post Installation EMI Test.................................................. A-1
LIST OF TABLES
Table No. Title Page
3-1 15-Pin D Connections .................................................... 3-3
LIST OF ILLUSTRATIONS
Figure No. Title Page
2-1 Operator's Switches and Controls - TFM-138B ................................ 2-3
2-2 TFM-138B Transceiver PC Up/Download Cable - Wiring Diagram ............... 2-12
3-1 Outline Drawing for TFM-138B Transceiver .................................. 3-2
3-2 Wiring Connections for TFM-138B Transceiver ................................ 3-4
3-3 Interal Enable/Disable Jumper and TX High/Low Power Adjust Locations ........... 3-6
3-4 Microphone and Sidetone Level, Main and Guard Squelch Adjustment Access ...... 3-8
3-5 Deviation Adjustment Potentiometer Location ................................ 3-10
ii
TFM-138B
SOFTWARE CHANGE NOTE
This document covers operation of the Technisonic TFM-138B, s/n 1500 and onwards which have been
delivered from the factory with version F14 software. For TFM-138B’s with s/n 1499 or less, TiL Document
95RE177 should be referred to.
This document does not cover the operation of older version TFM-138B’s with s/n 1499 or less.
iii
1-1
SECTION 1
GENERAL DESCRIPTION
1.1 INTRODUCTION
This publication provides operating and installation information on the TFM-138B (with version F14
software), Transceiver manufactured by Technisonic Industries Limited. The version F14 software
is factory installed in TFM-138B’s with s/n F1500 and onwards. The unit offers an extended frequency
range with selectable channel spacing and is intended for use (in the U.S.) only by government
agencies or contractors thereto, who have obtained licensing for operation in the 138-150 MHz portion
of the band. If the TFM-138B transceiver is used in CANADA, operation is restricted to the following
sub bands: 138-144, 148-148.99, 149.005-150.005 and 150.05-174 MHz.
1.2 DESCRIPTION
The TFM-138B, Transceiver is a frequency agile, fully synthesized airborne transceiver capable of
operating in the 138.000 MHz to 174.000 MHz frequency range in 2.5 kHz increments with either 25
kHz or 12.5 kHz channel spacing. The Transceiver can operate without restriction on any split
frequency pair in the band and also incorporates a two channel synthesized guard receiver.
The TFM-138B Transceiver provides 120 operator accessible memory positions, each of which is
capable of storing a transmit frequency, receive frequency, transmit frequency CTCSS tone or DPL
code, receive frequency CTCSS tone or DPL code, an alphanumeric identifier for each channel and
in the TFM-138B, wideband (25 kHz) or narrowband (12.5 kHz) channel spacing assignment.
Operating frequency and other related data are presented on a 48 character, two line LED matrix
display. Data entry and function control are performed via a 12 button keypad. Preset channels may
also be scrolled and scanned through keypad function activation. Data may also be entered via a PC
computer with the provided software and optional PIB-100 programming interface box or via an older
computer and PC Up/download cable, P/N 943165-4.
1.3 PURPOSE OF EQUIPMENT
The TFM-138B, VHF/FM Transceiver is designed to provide secondary airborne communications to
facilitate operations which are typically performed in a low altitude environment. The transmitter
section of this unit has a minimum of 8 watts and does not exceed 10 watts output power, which may
be reduced by a front panel switch to 1 watt, in order to reduce interference to land based systems.
1.4 MODEL VARIATION
There are four variations of the Model TFM-138B Transceiver. All units offer identical features
and performance except for the following differences:
TFM-138B, P/N 921012-1, Option B GREEN display and 28 Volt back lighting.
TFM-138B, P/N 921012-1 (5V), Option B GREEN display and 5 Volt back lighting.
TFM-138B, P/N 921012-2, Option B RED display and 28 Volt back ligting.
TFM-138B, P/N 921012-2 (5V), Option B RED display and 5 Volt back lighting.
Both P/N's 921012-1 and 921012-2 are always provided with 28 Volt back lighting unless a specific
request is made for 5 Volt AC operation. Version F14 software is standard in all variations from s/n
F1500 onwards.
1-2
1.5 TECHNICAL CHARACTERISTICS
Specification Characteristic
GENERAL
Model Designation: TFM-138B
Frequency Range: 138.000 to 174.000 MHz
Tuning Increments: 2.5 kHz
Operating Mode: F3E simplex or semi-duplex
Channel Spacing: 25 or 12.5 kHz
Physical Dimensions (including heatsink): Approx. 8.0" X 3.0" X 5.75"
Weight: Approx. 3.1 Lbs (1.4 Kg)
Mounting: Panel Mount via Dzus fastners
Operating Temperature Range: -45EC to +70EC
Power Requirement:
Voltage: 28.0 Vdc, ± 15%
Current: Receive - 0.7 A Max.
1 Watt Transmit - 1.3 A Max.
8-10 Watt Transmit - 2.0 A Max.
Frequency Selection: 120 memories programmed with:
a) Tx Frequency/Rx Frequency
b) Tx/Rx CTCSS tone or DPL code
c) 9 character alpha numeric title
Guard Receiver: 2 channels programmed with:
a) Tx Frequency/Rx Frequency
b) Tx CTCSS tone or DPL code
c) 9 character alpha numeric title
CTCSS squelch/encoder: All CTCSS tones available
DPL digital squelch/encoder: All standard DPL codes
DTMF encoder: All standard DTMF tones
Audio Output: 0.5 Watts into 600 ohms
Speaker Output: 2.5 Watts min. into 4 ohms
Back Lighting: 28 Volts (standard) or
5 Volts (specify)
Display Colour: Green (standard) or
Red (specify)
DPL is a trademark of Motorola Corporation
1-3
1.5 TECHNICAL CHARACTERISTICS (continued)
MAIN RECEIVER
Sensitivity at 12 dB SINAD Better than 0.35 µV
Adjacent Channel Selectivity -70 dB (25 or 12.5 kHz)
Spurious Attenuation -90 dB
Third Order Intermodulation -70 dB
Image Attenuation -80 dB
FM Acceptance ± 6 kHz
Hum and Noise Better than 50 dB
Audio Distortion less than 5%
Antenna Conducted Emission less than -70 dBm
GUARD RECEIVER
All specifications identical to main receiver
TRANSMITTER
RF Power Output 1 watt or 10 watts
Output Impedance 50 ohms
Maximum Deviation ±5 kHz (25 kHz mode)
(In narrowband mode) ±2.5 kHz(12.5kHz mode)
Spurious Attenuation -90 dB below carrier level
Frequency Stability ± 2.5 ppm
Microphone Circuit Carbon or equivalent
Sidetone Output 0.5W (max) into 600Ω
Harmonic Attenuation -65 dB below carrier level
FM Hum And Noise -40 dB
Audio Input 50 mV at 2.5 kHz into
200 Ω input circuit for
±3.5kHz deviation, adjst.
Audio Distortion Less than 5%
2-1
SECTION 2
OPERATING INSTRUCTIONS
2.1 FEATURES
The equipment has several important operating features which provide maximum flexibility,
performance and versatility. These features include:
1. 120 memory positions which can each be programmed with a transmit and receive frequency
with 25 or 12.5 kHz channel spacing, Tx/Rx CTCSS tones or DPL codes and a 9-character
alphanumeric title.
2. 2 guard channels which can each be programmed with a Rx frequency with 25 or 12.5
kHz channel spacing, CTCSS Tx tone or DPL code and a 9-character alphanumeric title.
3. Scanning of preprogrammed memories with selective memory scanning, in 5 scan lists.
4. Priority scan of memory channel 1, if desired.
5. Direct frequency entry mode.
6. Receive frequency simplex function.
7. Switchable RF output power between 1 watt and 8-10 watts.
8. Lockout of keyboard to prevent inadvertent entries.
9. Variable frequency mode to manually scan up and down in 2.5 kHz steps.
10. LED display variable dimming mode.
11. Selectable 90 second Tx time out feature.
12. Quick download of any of the 120 memory positions to the guard memories.
13. PC Memory Upload and/or download capability.
In addition to the above features the following list summarizes the NEW operating features and
improvements incorporated in the Version F14 software:
1. Configuration Menu - Pressing ENTER, RCL and FUNC together with all 3 front panel switches
in the “up” position while turning the radio on will put it into configuration
mode. The programming features that can be configured by this menu
include:
a) DPL - Can be turned on or off with th MUP and MDN
(4 and 7) keys. This only removes the DPL entry
step from the programming sequence and does not
stop memories that already have DPL codes from
working. This also applies to the rest of the on/off
configurable items.
b) Scan - Can be disabled. Selecting FUNC and SCAN will
do nothing if Scan is off. The scan list indicator (+)
will still display if was previously programmed.
c)
Rx CTCSS - Can be turned on or off from the
programming sequence. This affects only the
CTCSS tones for receive.
d) FUNC 7 - Can be turned on or off. When off, the main
memory channel can not be dumped into one of the
guard channels using function 7.
e) LAST MEM - If set to on, the last memory channel on
the display will be what comes up when the
radio is turned on. If set to off, the last memory that
changes were made to will be what comes up when
the unit is switched on.
2-2
2.1 (NEW) FEATURES - F14 Software (continued)
2. Fast Download - PC download is now much faster.
3. PC Up/Download - It is recommended to purchase the PIB-100 programming box complete
with Windows based programming software. However, as an alternative, it
is possible to use the older DOS software supplied with the radio if you have
an older 486 or early Pentium PC running DOS to program the radio. See
PC download instructions for more details.
4. Fast Scan - Scanning speed has increased. The delay between channels is now
dependent upon the amount of frequency change from the last
channel to the next instead of always assuming the worst case (138
to 174MHz). Four more scan lists have been incorporated so that
the pilot does not have to reprogram scanning when flying into a
new area or job site.
5. Quick Scan/Lock - A memory channel can quickly be put in or taken out of the scan list by
pressing
FUNC and then ENTER. The scan indicator is toggled on and off. The new
condition is saved in the eeprom.
6. New Characters - A couple of graphics ( * , ! and
#
) have replaced those unknown
shapes and designs that used to be at the end of the character list.
7. Rx CTCSS Updating - While programming the receive CTCSS tone the receiver is
updated immediately. This can help you find out what tone is
being used on a repeater or other radios by simply scrolling
through the tones until the squelch opens.
8. Guard Jumper - Programming of the guard channels can be totally disabled by
removing J15. (used to be the 138/150 jumper) This way, the
radio has to be disassembled in order to re-program either of the
guard frequencies. This may be required on US Forest Service contracts.
9. Variable Frequency mode - It is now possible to scroll to the frequency of 174.0000
MHz as long as the digits after the decimal are zeros.
10. Easier Programming - Several changes have been made to the programming mode
easier or quicker to use. These include:
a) When entering frequencies, you do not have to type in the entire frequency to
the last digit. Now you can type in what you need and hit ENTER. This is also
true for the direct entry mode.
b) If you change the receive frequency, the transmit frequency will change to the
same thing. This makes entering a simplex channel quicker.
c) When entering the alphanumerics, you can now backspace with the 1 key to
correct mistakes.
d) You do not have to go through the entire programming sequence anymore. At
any time you can press the FUNC key and it will save all changes that have
been made and return to normal operating mode. This is also true for the tone
programming mode and the direct entry mode.
2-3
FIGURE 2-1 Operator's Switches and Controls - TFM-138B
2-4
2.2 OPERATING INSTRUCTIONS (See Figure 2-1)
1. Switch power on by turning the main volume clockwise. Depending how the radio is
configured, either the last programmed or last displayed frequency will appear on the screen.
The transceiver is now in normal operating mode.
2. Adjust the audio level by adjusting the main and guard volume knobs.
3. Pressing the squelch defeat button will open both receivers to confirm they work.
4. Read the display. The top line will indicate the memory selected followed by a "+" if the
memory position is included in a scan list, an alphanumeric message, and the frequency of
the main receiver. A small "n" before the frequency indicates 12.5 kHz narrowband channel
spacing is in effect on this memory position. In the receive mode, the frequency is followed
by an "RT" if a RX CTCSS tone or RX DPL code is programmed, or an "RX" if no Receive
tone/code is programmed. Similarly, in the transmit mode either a "TT" or "TX" is shown after
the frequency. The bottom line indicates similar information about the guard receiver.
5. Only TX CTCSS tones or TX DPL codes may be programmed for the guard receiver.
At the beginning of each line, an LED indicates open squelch.
6. Set the MN/GD switch to main or guard transmit frequency.
7. Set the G1/G2 switch to the desired guard channel.
8. Set the HI/LO switch to the desired RF output power.
9. Select the desired memory by using the M.UP and M.DN buttons, or the RCL button
and a three digit number followed by ENTER.
10. To transmit DTMF tones, use the keyboard keys while holding the PTT button on the
microphone. The keyboard returns to its normal function when the PTT is released.
The display shows the status of both receivers and the transmitter. The light at the left of the top and
bottom line indicates which receiver is receiving. The display also indicates the memory channel
in use and the guard channel in use. A "TX" (no TX tone/codes programmed) or "TT"(either TX tone
or code programmed) on the right side of the display indicates whether the guard or main channel is
active when transmitting. The transmit frequency is also shown. In the receive mode the display
shows “RX” beside the receive frequency if no RX tone or DPL code is programmed and “RT” if a
CTCSS tone or DPL code is programmed.
When the transceiver is in either of the operating frequency or CTCSS tone/DPL code programming
modes and you must respond to a call, click the microphone PTT once (the radio will not transmit
during this click). This will cause the transceiver to revert back to the normal operating mode and
communications with the caller can proceed in the usual fashion.
2-5
2.3 PROGRAMMING INSTRUCTIONS
To program one of the 120 memory channels in the TFM-138B:
1. Press the FUNC key. The display will show the function prompt.
2. Press the PROG key. The display will show the current receive frequency with a
flashing curser on the second digit (The first digit is always a one <1>).
3. Type in the desired receive frequency. If you type in a frequency which is not a 2.5 kHz step,
the nearest valid frequency will be automatically selected.
4. The curser will return to the second digit. You can now retype the frequency if you
made an error or press ENTER to continue.
5. The transmit frequency will be displayed with the curser on the second
digit. Follow the same method as in step 3 and 4.
6. The channel spacing increment of either 25.0 or 12.5 kHz is now displayed. Use the
M.UP and M.DN keys to select the desired channel spacing for the memory position,
then press ENTER.
7. The alpha-numeric title is now displayed. Use the M.UP and M.DN keys to scroll through the
alphabet, numbers and symbols. When the desired character is displayed,
press ENTER to advance to the next character. Press “1" to backspace.
8. Keep repeating step 7 until the last space is set. The display will show SCAN or LOCKOUT
to enable this memory position as part of the scan list or to lock it out of the scan list. Use the
1,2,3,4,5 keys to add the channel to the corresponding scan list or press M.DN to clear the
channel from all scan lists. (for details see paragraph 2.4). Once the desired condition has
been selected, press ENTER. The TFM-138B's display will later show a "+" beside the
memory channel number if scan is enabled.
9. The display will now show the current memory number. Type in the 3-digit number of
the memory you want to save to (if different from displayed one) and press ENTER.
10. You now have the option to program the guard frequencies by pressing FUNC or press
ENTER to return to normal operating mode.
11. If you pressed FUNC to program the guards, guard"1" transmit frequency will be
displayed with the flashing curser on the second digit. Enter the frequencies for
guard"1" receive/transmit and guard"2" receive/transmit as in step 3 and 4.
12. The alphanumeric labels for guard"1" and guard"2" are entered the same as in step 7 and
8. When the last character is entered, the radio returns to normal operating mode. If the
guard is be be programmed for 12.5 kHz narrowband operation, use the QUICK GUARD
PROGRAMMING FEATURE described in paragraph 2.12. A memory position must be
programmed to the 12.5 kHz mode then the contents can be quickly downloaded to GD1 or
GD2 memory positions.
Programming of memory is disabled when the internal entry disable jumper is set. Alternatively
any transceiver can be programmed by an IBM PC or compatible computer. See section 2.14
PC Memory/Programming Download Capability.
2-6
2.4 PRIORITY SCANNING, SELECTIVE MEMORY CHANNEL SCANNING AND SCAN LISTS
Instead of breaking up the 120 channels into blocks for scanning, the TFM-138B (with F14 software)
has 5 scan lists. Any of the 120 channels can be assigned to any one of more of these 5 scan lists.
This means the channels do not have to be repeated for them to be in more than one block and that
you are not limited to the number of channels that you can scan at once, since all 120 channels can
be put into any scan list.
The priority memory channel is always memory position number 1. The priority memory channel is
scanned every other step (ie. 121314151...) to ensure that no incoming messages are missed. The
priority channel can be locked out, which will result in the normal scanning of the other memory
positions.
Selective memory scanning allows the user to select which of the 120 memory channels are to be
scanned or locked out when the scan function is invoked. To use this feature, follow the
PROGRAMMING INSTRUCTIONS found in paragraph 2.3. Once the screen displays SCAN or
LOCKOUT, use the 1,2,3,4 or 5 key to add the channel to the corresponding scan list or lists. The
M.DN key acts as a clear button removing the channel from all scan lists and displaying LOCKOUT.
Press ENTER when you are happy with your selections. In normal operating mode the display will
later show a "+" beside the memory channel number if it has been included in any of the 5 scan lists.
2.5 SCANNING FUNCTION (5 second talkback delay)
1. To start scanning of the memory channels, press FUNC then SCAN and then the
number (1,2,3,4,5) of the desired scan list.
The radio will scan through all the preset memory positions in the selected scan list (see above
paragraph for priority and selective scan features) and will lock on to the first active channel in the
scan sequence. It will remain on the channel until it becomes inactive. Scanning will resume again
after five seconds of inactivity. To exit the scan mode, press the SCAN key. This will cause the radio
to revert back to the normal operating mode.
Therefore if while scanning, you hear a call for you:
1. Respond to the call within 5 seconds. When scanning is interrupted by an
incoming signal, the channel will remain open for five seconds before resuming
scanning.
2. During communications the five second timer is reset from the last Rx or Tx
signal experienced.
The radio resumes scanning once the Rx or Tx activity has ceased for more than five seconds.
The SCAN key must be pressed to exit the scan mode.
2.6 DIRECT FREQUENCY ENTRY MODE
This mode is designed to facilitate quick frequency selection during emergency and other operational
conditions requiring direct operating frequency selection. This operating mode is disabled along with
the programming mode when the internal disable jumper is set.
When the transceiver is in the normal operating mode, press FUNC and the desired operating
frequency ie/ 153.275. Please note in the above operation, after FUNC and "1" are entered, the LED
display will show memory channel "000" and then the remaining digits in the desired frequency are
shown as they are entered. No alphanumeric message can be entered in this mode. Operation on
the new frequency occurs in both transmit and receive (simplex only) modes. If RX or TX CTCSS
tones/DPL codes are required they must be programmed in.
2-7
2.7 RECEIVE FREQUENCY SIMPLEX FUNCTION
The receive frequency simplex function allows you to quickly change the transmit frequency, when
operating on a split pair (repeater/semi-duplex mode), to the receive frequency to allow direct
communications. ie/ If you are transmitting on 152.000 MHz and receiving 152.555 MHz, press FUNC
then UP to transmit on 152.555 MHz. To return to the split pair condition, you must recall the memory
channel again. This is quickly done by pressing M.UP for one step up, then back down one step with
the M.DN key.
2.8 KEYBOARD LOCKOUT FUNCTION
The keyboard can be locked out so that accidental pressing of keys does not change frequency, etc.,
unknowingly to the operator. To lock the keyboard, press FUNC then LOCK. This will disable all
keyboard functions (except keyboard unlock) in the receive mode. The DTMF function during transmit
will not be affected. To unlock the keyboard, press and hold the LOCK key for two seconds until the
display indicates "UNLOCK".
2.9 VARIABLE FREQUENCY MODE FUNCTION
To enter variable frequency mode, press RCL, 0,0,0, then ENTER. The memory channel that you
were just in will still be valid but now you can manually adjust the frequency with the M.UP, M.DN, UP
and DN keys. The UP and DN keys will make the frequency count up or down in steps of 2.5 kHz. The
M.UP and M.DN keys will make the frequency count up or down in steps of 1 MHz. You can not
change the label. The frequency in this mode can not be stored in memory. To exit this mode, recall
one of the 120 memory channels (ie. RCL, 0,0,1). Variable frequency mode is disabled when the
internal entry disable jumper is set.
2.10 LED DISPLAY VARIABLE DIMMING MODE
1. With the transceiver in normal operating mode press the UP or DN keys to increase or
decrease the intensity of the LED display.
2. Once maximum intensity of the display is acheived, the UP key no longer functions.
Conversely once minimum intensity is reached, the DN key ceases to function.
2.11 90 SECOND TRANSMITTER TIME OUT FEATURE
A selectable 90 second transmitter time out feature is provided to prevent accidental continuous
transmission in the event of a faulty PTT switch. With this feature enabled the transceiver will stop
transmitting after the PTT is engaged continuously for 90 seconds. The timer is reset by releasing
then re-engaging the PTT switch.
Press the FUNC then the M.UP key. Use the M.UP and M.DN keys to select 90 SEC, which
enables the feature, or NONE which disables it.
2.12 QUICK GUARD PROGRAMMING FEATURE
A quick download of any of the 120 memory positions to either of the guard memory positions can be
accomplished. Select the memory position whose contents you desire to download to a guard
memory. Select either GD1 or GD2 memory channel as desired. Press FUNC then 7. The guard
memory channel will now contain all the same information as the selected memory position. This
feature is disabled when guard jumper (J15, pins 1&2) on the MCU board is removed.
2-8
2.13 PROGRAMMING CTCSS TONES/DPL CODES
CTCSS tones (PL tones) or Digital DPL codes can be assigned to each memory channel. The
guard receiver squelch will operate only on carrier detection, but guard 1 and 2 transmit tones
or codes can be programmed. To program a tone/code to a memory channel:
1. Use the M.UP and M.DN keys to select the memory channel that you want to assign
a CTCSS tone or DPL code.
2. Press the FUNC key then the TONE key. The display will show "RX TONE:" and the
current tone number, as well as the tone frequency in Hz.
3. Use the M.UP and M.DN keys to select the tone number you require. The following
is a list of the available CTCSS tones:
Number Tone Number Tone Number Tone
01 67.0 26 162.2 51 177.3*
02 71.9 27 167.9 52 183.5*
03 74.4 28 173.8 53 189.9*
04 77.0 29 179.9 54 196.6*
05 79.7 30 186.2 55 199.5*
06 82.5 31 192.8 56 206.5*
07 85.4 32 203.5 57 210.7*
08 88.5 33 33.0* 58 218.1*
09 91.5 34 35.4* 59 225.7*
10 94.8 35 36.6* 60 229.1*
11 97.4 36 37.9* 61 233.6*
12 100.0 37 39.6* 62 241.8*
13 103.5 38 44.4* 63 250.3*
14 107.2 39 47.5* 64 No Tone
15 110.9 40 49.2* (carrier squelch only)
16 114.8 41 51.2* (The tones marked with * are
17 118.8 42 53.0* nonstandard tones).
18 123.0 43 54.9*
19 127.3 44 56.8*
20 131.8 45 58.8*
21 136.5 46 63.0*
22 141.3 47 69.4*
23 146.2 48 159.8*
24 151.4 49 165.5*
25 156.7 50 171.3*
4. Press ENTER. "TX TONE" appears on the display. Repeat step 3.
5. Press ENTER. "G1 TONE" appears on the display. Repeat step 3.
6. Press ENTER. "G2 TONE" appears on the display. Repeat step 3 and press ENTER.
2-9
7. The display will now show "RX DPL:" and the current 3-digit DPL code. If no DPL
code is required "000" should be entered. Please note that if a DPL code is to be
programmed a CTCSS tone should not be enabled.
8. Use the keypad to enter the required octal 3-digit DPL (Digital Coded Squelch or DCS)
code. A list of all usable and unique octal 3-digit DPL/DCS codes follows:
017* 051 116 156 243 266* 346 431 466 612 721
023 053* 122* 162 244 271 351 432 503 624 731
025 054 125 165 245 274* 356* 445 506 627 732
026 065 131 172 246* 306 364 446* 516 631 734
031 071 132 174 251 311 365 452* 523* 632 743
032 072 134 205 252* 315 371 454* 526* 654 754
036* 073 143 212* 255* 325* 411 455* 532 662
043 074 145* 223 261 331 412 462* 546 664
047 114 152 225* 263 332* 413 464 565 703
050* 115 155 226 265 343 423 465 606 712
* indicates GE Digital Coded Squelch (DCS) Code
9. Press ENTER. "TX DPL" appears on the display. Repeat step 8.
10. Press ENTER. "G1 DPL" appears on the display. Repeat step 8.
11. Press ENTER. "G2 DPL" appears on the display. Repeat step 8 and press ENTER.
2.14 PC MEMORY PROGRAMMING UP/DOWNLOAD CAPABILITY
The Technisonic Data Programmer (Multi-TDP) Windows based software is supplied on a CD
with the TFM-138B transceiver or is available for download from our web site www.til.ca . This
software will allow anyone with a standard personal computer (PC) and the PIB-100 programming
box to send or retrieve data from a connected TFM-138B transceiver for editing, sorting and
sharing with other Technisonic transceivers.
The Multi-TDP programmers are 32 bit Windows applications that will work under Windows 95,
Windows 98, Windows NT 4.0 and Windows 2000. Documentation for each of the respective
Programmers is available from the pull down "Help" menu at the top of the programmer display.
To use the Windows based program with the TFM-138B, the PIB-100 programming interface box,
P/N 001108-1, incudes all required cables and must be purchased from Technisonic or other re-
seller.
The CD supplied with the transceiver also contains a DOS based download program that can be
used with the TFM-138B and no interface box. However changes in operating systems and PC
hardware that have occurred since the release of our DOS compatible software, prevent it from
working with most modern computers. Computers with 486 processors or some early Pentium
type processors of 200 MHz or less running MS DOS seem to work the best. Please check the
“Programmer downloads” link on our web site www.til.ca for further information regarding PC
programming information for users of single band transceivers like the TFM-138B.
The user instructions for the Windows based Multi-TDP software and then the DOS based
software follow below:
2-10
2.14.1 Windows Program Requirements:
1. PC compatible computer running Windows 95/98/NT/2000/ME. CD ROM drive and an
available serial port.
2. Bench power supply of 28 volts DC.
3. PIB-100 Programming Interface Box (p/n 001108-1) - use cables that are provided with the
PIB-100 programming interface box. Do not use cable p/n 943165-4 which is shown in Figure
2-2 and is for use with the DOS program only.
2.14.2 Windows Program Installation:
1. Insert the CD into the drive.
2. Open the CD with windows explorer.
3. Open the MultiTDP directory and double click the MultiTDP_Install.exe file.
4. Follow on screen instructions.
2.14.3 Connections:
1. Follow the connection instructions supplied with the PIB-100.
2. Do not turn on the 28 volt power supply until all connections have been made.
2.14.4 Running the Windows Program:
1. On the computer, click the Start menu button.
2. Select Programs from the Start menu.
1. Select Technisonic from the Programs menu.
2. Select MultiTDP.
3. The program will start. The MultiTDP program is used for almost all of Technisonic’s
transceivers, therefore it has to be set up specifically for your TFM-138B.
4. Pull down the File menu and click Select Radio.
5. Click the TFM-30/138/138B/403 line.
6. The display will configure itself for the PIB-100. Click the dot beneath TFM-138B.
7. Pull down the Com Port menu and select the com port that you have connected the PIB-100.
8. The software is now ready to use. To get a full instruction manual, pull down the Help menu
and select Documentation in PDF format.
2-11
2.14.5 Helpful Hints:
When uploading or downloading, a message box will appear asking you to press FUNC and then
7 on the radio. Press these keys before clicking the OK button in the message box.
2.14.6 DOS Program Requirements:
1. PC compatible computer with:
C200 MHz or less
C486 or early Pentium one processor
CPrinter port (LPT1)
CCD drive - If not, you can copy the software on another computer to a floppy
disk.
CColour monitor is preferred as some of the text is colour coded.
2. Bench power supply of 28 volts DC.
3. PC Download cable (p/n 943165-4) see figure 2-2.
2.14.7 DOS Program Installation:
1. Insert the CD into the drive.
2. Create a directory on your hard drive called \TIL.
3. Copy everything from the \PCDLB2 directory on the CD to the \TIL directory on the hard drive.
2.14.8 Connections:
1. Connect the PC download cable (p/n 943165-4) to the radio.
2. Connect the other end of the cable to the printer port on the computer
3. Connect the red and black leads to the power supply.
2.14.9 Running the DOS Program:
1. Turn on the 28 volt power supply.
2. Turn on the radio. The channels on the radio may start scrolling - this is normal.
3. Change to the \TIL directory and type PCDLB2 and enter. The radio should stop scrolling. Do
not use older DOS software (\PCDLB) for TFM-138B’s that have F12 firmware (s/n 1499 and
less). It is not compatible with DOS download software for TFM-138B’s with F14 firmware.
Your frequency information will become corrupted as it is downloaded to a TFM-138B with
F14 firmware.
4. Follow the menus to edit channels, print channel list, up or download as desired.
5. The data file is continuously updated as each change is made, so you don’t have to save the
file at any time. To have multiple data files, you will have to copy the data file to another name
and then copy it back when needed. There always has to be a data file called “DATA12" or
the program will not work.
2-12
2.14.10 Helpful Hints:
* Be sure to never plug in the radio while the power supply is on or damage may occur to your
printer port.
CYou can only use LPT1 as the printer port. Make sure it is enabled in the BIOS.
CThe program works best on older, slower computers but has worked on some new PCs
running DOS. A good way to try this out is to make a DOS bootable floppy with the software
on it running the software from the A: drive.
TFM-138B Upload/Download Programming Cable For DOS Program
P/N 943165-4 - Wiring Diagram
FIGURE 2-2 TFM-138B Transceiver PC Download Cable - wiring diagram
(for DOS program only)
3-1
SECTION 3
INSTALLATION INSTRUCTIONS
3.1 GENERAL
This section contains information and instructions for the correct installation of the TFM-138B,
VHF/FM Transceiver.
Make certain that the correct frequencies are preprogrammed in accordance with the equipment
user's valid FCC operator's license, prior to installation.
3.2 EQUIPMENT PACKING LOG
Unpack the equipment and check for any damage that may have occurred during transit. Save
the original shipping container for returns due to damage or warranty claims. Check that each
item on the packing slip has been shipped in the container. Verify that the equipment display and
backlighting configuration are the same as those ordered.
3.3 TRANSCEIVER INSTALLATION
The TFM-138B Transceiver is designed to be Dzus mounted and should be installed in
conjunction with a IN-150 installation kit. See Figure 3-1 for an outline drawing of the unit with
dimensions to facilitate the installation.
3.4 INSTALLATION KIT - CONTENTS
The IN-150 installation kit consists of:
1. One 15 pin Cannon D connector (female) complete with crimp pins and hood.
2. One BNC antenna mating RF connector (male) and hood.
3.5 ANTENNA INSTALLATION
Antenna, P/N ATM-150 may be obtained from Technisonic Industries Limited or a suitable
equilvalent may be utilized with the TFM-138B transceiver. The antenna should be mounted on
the bottom of the aircraft whenever possible. Consult with instructions provided with the antenna.
Connect RF cable from antenna to the back of the TFM-138B unit by utilizing the BNC mating
connector provided in the installation kit.
3.6 INSTALLATION - PIN LOCATIONS AND CONNECTIONS
The pin numbers and locations for the 15 pin Cannon D located on the rear of the TFM-138B
transceiver are shown below. Pin connections are in provided in TABLE 3-1.
Transceiver mounted view of 15 pin connector
3-2
FIGURE 3-1 Outline Drawing for Model TFM-138B Transceiver
3-3
3.6 INSTALLATION - PIN LOCATIONS AND CONNECTIONS (continued)
TFM-138B Transceiver
15-Pin D Connections
Pin # Description
1 600 Ohm Output
2 Data Output
3 Panel Lighting (28VDC or 5VAC)
4 Memory UP/PC Download Input
5 Memory Down/PC Download Input
6 Mic Signal Input
7 Main Power +28VDC
8 Main Ground
9 4 ohm Speaker Output
10 4 ohm/600 ohm Output Ground
11 Data Input
12 PC Download Input
13 PTT (Ground Keying)
14 Main Power +28VDC
15 Main Ground
TABLE 3-1
3.7 WIRING INSTRUCTIONS
Figure 3-2 shows all required connections and recommended wire sizes for the TFM-138B
Transceiver.
3.7.1 Main Power +28VDC
The main power +28VDC (±15%) is connected to pins 7 and 14 of the transceiver. Both
pins should be connected.
3.7.2 Main Ground
Ground connections for the transceiver are made on pins 8 and 15. Both pins should be
connected.
3.7.3 PTT (Ground Keying)
The PTT line is connected to pin 13 and should be floating when the transceiver is in receive
mode, and grounded during transmit mode.
3-5
3.7.4 Front Panel Back Lighting
Front panel back lighting connection should be made on pin 3 of the transceiver. The opposite
end of this lead should be connected to the panel lighting system of the aircraft. Before
connecting, verify the required panel lighting voltage (28 VDC or 5VAC) on the transceiver
configuration control label.
3.7.5 Audio Outputs (600 ohms and 4 0hms)
The audio output from pin 9 can be used to drive a 4 ohm speaker up to 2.5 watts. Audio output
from pin 1 is 600 ohms, 0.5 watts maximum.
3.7.6 Audio Output Ground
Pin 10 is the ground for both the 4 ohm and 600 ohm audio output signals on pins 9 and 1.
3.7.7 Mic Signal Input
The microphone input signal is to be provided on pin 6, utilizing shielded wire with the shield
grounded to pin 10.
3.7.8 Memory Up/Memory Down
Remote scrolling through the 120 memory positions can be achieved by providing a ground to
pins 4 (up) and 5 (down) through a momentary contact cyclic switch.
3.7.9 Data Input
Data communications equipment requiring direct access to the modulator and discriminator can
be connected via pins 2 and 11. Data cannot be transmitted in CANADA unless equipment is
approved for use with the TFM-138B by the communications regulatory authority.
3.8 INTERNAL PROGRAMMING AND GUARD ENABLE/DISABLE JUMPER
The programming and direct frequency entry modes can be disabled by removing the internal
enable/disable jumper strap from pins 2 and 3 of J15. Removal of this jumper will prevent
operation on any frequencies other than those programmed in the 120 memory positions and two
guard receiver memory positions. Removal of the guard receiver programming enable /disable
jumper strap from pins 1 and 2 of J15 will totally disable the operator’s ability to re-program the 2
guard receiver channels.
The transceiver is always shipped with the two jumpers in the entry enable positions. To place
either of the jumpers in the disable position:
1. Remove and retain the seven (7) No. 4-40 screws securing the bottom cover of the
transceiver to its chassis.
2. Remove and retain the four (4) No. 4-40 screws securing the guard receiver PCB
module in the chassis tray. Remove the guard receiver module from the chassis tray.
3. Remove and retain the five (5) screws securing the chassis tray to the main chassis.
Remove the chassis tray.
4. You should now have access to the Microprocessor Control Unit (MCU) PCB Module (See
Figure 3-3). Remove the enable/disable jumper from pins 3 and 4 or pins 1 and 2 of J15,
as desired.
5. Reverse steps 1 through 3 and secure all screws to re-assemble the transceiver.
3-6
Microprocessor Control Unit (MCU) PCB Module
Notes: R23 is High Power Adjustment
R24 is Low Power Adjustment
J15 Jumper between pins 3 and 4 for Entry Enable
Remove for Entry Disable
FIGURE 3-3 Internal Enable/Disable Jumper and Transmit High/Low Power Adjust Locations
3-7
3.9 TRANSMITTER POWER ADJUSTMENTS
The transmitter power is adjusted to a maximum of 10 watts in high power mode and 1 watt in low
power mode over the transceiver operating bandwith at the factory. If transmitter RF power re-
adjustment is required, perform as follows:
1. Remove bottom cover as described in the previous paragraph (3.8). Access to the two
adjustment potentiometers on the Microprocessor Control Unit (MCU) PCB Module is
provided by two access holes located at the back of the chassis tray.
2. Connect an RF through-line wattmeter to the antenna connector. Set the operating
frequency to 156.000 MHz and key the transmitter.
3. In low power mode, set the low power adjustment potentiometer R24 to produce 1.0 watt
of RF output power (See Figure 3-3).
4. In high power mode, set high power adjustment potentiometer R23 to produce 9.5
watts of RF output power.
5. Verify that the RF output power is between 8 and 10 watts on 138.000 MHz, 156.000 MHz
and 174.000 MHz.
6. Replace bottom cover as described in the previous paragraph (3.8).
3.10 TRANSMITTER MICROPHONE LEVEL ADJUSTMENT
1. Set the transceiver operating frequency to 156.000 MHz and connect an appropriate test
receiver to the RF output connector. Ensure that the output of the transceiver is
terminated into a proper dummy load.
2. Key the transmitter and input a -10 dBm (0.25 VRMS), 1 kHz audio signal into the
microphone input.
3. Adjust the microphone level potentiometer (R8 on MCU module) through the access
hole located on the right side of the chassis (see Figure 3-4) to produce a 3.5 kHz
deviation.
4. Verify that the deviation is at least 3 kHz on the following frequencies: 138.000 MHz,
156.000 MHz and 174.000 MHz.
3.11 TRANSMITTER SIDETONE LEVEL ADJUSTMENT
1. Set the transceiver operating frequency to 156.000 MHz and connect an appropriate test
receiver to the RF output connector. Ensure that the output of the transceiver is
terminated into a proper dummy load.
2. Key the transmitter and input a -10 dBm (0.25 VRMS), 1 kHz audio signal into the
microphone input.
3. Adjust the sidetone level potentiometer (R37 on MCU module) through the access hole
located on the left side of the chassis (see Figure 3-4) to produce a +3.0 dBm (1.0 VRMS)
600 ohm audio output.
3-8
FIGURE 3-4 Microphone and Sidetone Level, Main and Guard Squelch Adjustment Access Holes
3-9
3.12 MAIN AND GUARD SQUELCH ADJUSTMENT
The squelch on both the main and guard receivers is factory set to open at approximately 1.0
microvolts. This adjustment can be made or altered to suit local conditions as follows:
1. Set the main receiver of the transceiver to 156.000 MHz. Connect a signal generator to
the the antenna input of the transceiver.
2. Set the signal generator to produce a ±3 kHz deviation with a 1 kHz tone on 156.000
MHz. Set the signal generator RF level to 1.0 uV . The squelch indicator LED is on and
signal is heard. Set the generator to 0.6uV. The squelch indicator should go off and no
signal heard.
3. If not, re-adjust main receiver squelch potentiometer, R3 through the access hole
located on the bottom of the transceiver chassis (see Figure 3-4).
4. Repeat the above procedure to adjust the guard receiver squelch setting using guard
receiver squelch adjustment potentiometer, R4 (see Figure 3-4).
3.13 TRANSMITTER DEVIATION ADJUSTMENT
1. Remove and retain the eight (8) No. 4-40 screws securing the top cover of the
transceiver to its chassis. You should now have access to the Main Rx/Tx Module.
2. Set the transceiver operating frequency to 156.000 MHz and connect an appropriate test
receiver to the RF output connector. Ensure that the output of the transceiver is
terminated into a proper dummy load.
3. Key the transmitter and input a +10 dBm (2.5 VRMS), 1 kHz audio signal into the
microphone input.
4. Adjust the wideband deviation limit potentimeter, R30 on the main Rx/Tx module (see
Figure 3-5) to produce a ±4.2 kHz deviation. Adjust the narrowband deviation limit
potentimeter, R76 on the main Rx/Tx module to produce a ±2.1 kHz deviation.
5. Verify that the deviation does not exceed ±5 kHz for wideband and ±2.5 kHz for
narrowband on the following frequencies: 138.000 MHz, 156.000 MHz and 174.000 MHz.
Re-adjust R30 or R76 as required, if the deviation exceeds ±5 kHz or ±2.5kHz,
respectively.
6. Place top cover on transceiver chassis and secure all eight (8) screws.
3.14 GUARD RECEIVER AUDIO LIMIT FEATURE
Upon special request, 1 mW of guard receiver audio bleed with the guard volume control in the
fully CCW (OFF) position, can be provided. This feature can be disconnected as follows:
1. Remove and retain the seven (7) No. 4-40 screws securing the bottom cover of the
transceiver to its chassis.
2. Find the jumper located at the bottom of the front panel is connected between the CCW
position of the guard audio potentiometer (R2) and ground. Remove this jumper.
3-10
3. Replace the bottom cover of the transceiver and secure with the seven (7) screws
removed in step 1.
Main Receiver/Transmitter PCB Module
Notes: R30 is for 5.0 KHz (wideband) Deviation Adjustment
R76 is for 2.5 KHz (narrowband) Deviaton Adjustment
FIGURE 3-5 Deviation Adjustment Potentiometer Location
A-1
APPENDIX TO “INSTALLATION INSTRUCTIONS”
POST INSTALLATION EMI TEST
PURPOSE
The purpose of this test is to identify any interference that the TFM-138, TFM-138A or TFM-138B
may cause with existing aircraft systems. For simplicity all TFM-138 model variations will be
referred as TFM-138 series transceivers in this document.
TEST CONDITIONS
The TFM-138 series transceiver should be installed and function tested. The antenna VSWR
should be checked. A forward/reverse power check with a in-line wattmeter should show no
more than 10% reflected power. For the following tests, insure that the power switch is in the
high position.
METHODOLOGY
Most of the EMI tests can be accomplished on the ground. In some cases flight testing is required
or is easier. If the aircraft is approved for IFR operations, then it is mandatory that interference
between the TFM-138 series Airborne FM and the approach aids be checked in flight.
The GPS should be operational and navigating with at least the minimum compliment of satellites.
The VHF comm should be set to the frequencies indicated with the squelch open. VOR/ILS/GS
receivers should be set to the frequencies indicated and selected for display If possible, set up a
VOR/ILS ramp test set on the frequencies indicated and adjust the output until the flags are out of
view. The transponder and encoder should be monitored with ramp test equipment. If possible
set the ADF to a nearby navigation station.
Modulate the TFM-138 series transmitter on the indicated frequencies for at least 20 seconds.
Observe the GPS for any degradation in satellite status or availability or flags. Listen for any
noise or detected audio signals on the VHF comm(s). Listen for any noise or detected audio
signals on the VOR/LOC receiver audio; look for any moment of flags or needles on the
VOR/LOC/GS navigation display(s).
List the power plant, fuel and other electric instruments in the chart provided and note any
anomalies that occur while transmitting. Assess the results.
If the aircraft is equipped with an autopilot or a stability augmentation system, then test fly the
aircraft and verify that operation of the TFM-138 series transceiver does not have adverse effects
on these systems. After checking for gross effects at a safe altitude, fly an approach with each of
the different navigation systems coupled to the autopilot (ILS, GPS ETC.) and look for any
anomalies.
RESULTS
If the installed system passes all of the applicable EMI tests, then no further action is required. If
interference is observed then the interference must be assessed against the appropriate
standards of airworthiness for the system in question. For example it is permissible for a VFR
certified GPS to lose navigation capability while the TFM-138 series unit is transmitting, providing
that it recovers properly and promptly, but it is not permissible for an IFR Approach certified GPS
to be affected in the same way. A complete discussion of all the standards of airworthiness to be
applied in assessing EMI effects is beyond the scope of this document.
A-2
PROCEDURE
A. Operate the TFM-138 series transmitter on the following frequencies for at least 20
seconds. Observe the GPS for any degradation in satellite status or availability or flags.
FREQUENCIES GPS #1 GPS #2
TFM 138 PASS FAIL PASS FAIL
143.180 MHZ
143.1825 MHZ
157.5000 MHZ
157.5425 MHZ
NOTES:
A-3
B. Determine if the image frequency for the VHF Comm falls within the range of the TFM-138
series unit. If so, select a set of frequencies that will cause the TFM-138 series unit to be
set as close as possible to the image frequency. Any one of the many possible sets will
suffice. Record those values in the spaces provided in the following chart. Modulate the
TFM-138 series transmitter on the following frequencies for at least 20 seconds. Listen for
any noise or detected audio signals on the VHF comm.
Example - Bendix/King KY 196A:
The first IF frequency is 11.4 MHZ. The L.O. is above the received frequency (high side
injection), therefore the image frequency is 22.8 MHZ above the selected frequency. Set
the KY 196A to 120.000 MHZ and the TFM-138 series Transceiver to 142.8000 MHZ.
FREQUENCIES RESULTS
VHF #1 TFM-138 series PASS FAIL
135.975 138.0000
121.150 157.5000
131.250 157.5000
Image:
FREQUENCIES RESULTS
VHF #2 TFM-138 series PASS FAIL
135.975 138.0000
121.150 157.5000
131.250 157.5000
Image:
NOTES:
A-4
C. Determine if the image frequency for the VOR/ILS Nav falls within the range of the TFM-138
series unit. If so, select a two sets of frequencies that will cause the TFM-138 series
transceiver to be set as close as possible to the image frequency. Chose one set in the
localizer frequency range, and one in the VOR frequency range. Record those values in the
spaces provided in the following chart. Modulate the TFM-138 series transmitter on the
following frequencies for at least 20 seconds. Listen for any noise or detected audio
signals on the receiver audio; look for any moment of flags or needles on the navigation
display.
FREQUENCIES RESULTS
VOR/ILS #1 TFM-138 series PASS FAIL
108.000 162.0000
108.100 162.1500
Image:
Image:
FREQUENCIES RESULTS
VOR/ILS #2 TFM-138 series PASS FAIL
108.000 162.0000
108.100 162.1500
Image:
Image:
NOTES:
A-5
D. Modulate the TFM-138 series transmitter on the following frequencies for at least 20
seconds. Look for any moment of flags or needles on the navigation display.
FREQUENCIES RESULTS
G/S #1 TFM-138 series PASS FAIL
334.7 (108.1) 167.3500
FREQUENCIES RESULTS
G/S #1 TFM-138 series PASS FAIL
334.7 (108.1) 167.3500
NOTES:
A-6
NOTE:
For the following tests, select a frequency at the top, middle and bottom of the range of the TFM -
138 series transceiver.
Frequency #1 ______________ Frequency #2 ______________
Frequency #3 ______________
E. At a safe altitude engage the autopilot or stability augmentation system. Modulate the
TFM- 138 series transmitter on the above frequencies for at least 20 seconds. Observe
any effect on the autopilot or stability augmentation system.
Observations:
F. Perform a coupled ILS approach to the aircraft's certified limits. Modulate the TFM-138
series transmitter on the above frequencies for at least 20 seconds. Observe any effect on
the autopilot. Repeat for each different system such as ILS #2, GPS, FMS ETC.
Observations:
A-7
G. List the power plant, fuel and other electric instruments in the chart provided and note any anomalies that occur while
transmitting. Assess the results.
STEP SYSTEM PASS FAIL NOTES
1 Xponder & Encoder
2 ADF 1 & 2
3VG
4 Compass
5 Directional Gyro
6 Oil Pressure
7 Fuel Pressure
8 Oil Temp
9Amps
STEP SYSTEM PASS FAIL NOTES
A-8
10 Bus Voltage
11 Fuel %
12 Ng
13 TOT
14 Torque %
15 Annunciators
16 Digital Clock
STEP SYSTEM PASS FAIL NOTES
A-9
STEP SYSTEM PASS FAIL NOTES
A-10
STEP SYSTEM PASS FAIL NOTES
A-11
NOTES: