TAIYO MUSEN CO., LTD. TD-L1630 User manual

INSTRUCTION MANUAL
OF
AUTOMATIC DIGITAL DIRECTION FINDER

TD-L1630
- OPERATION, INSTALLATION and MAINTENANCE-
TAIYO MUSEN CO., LTD.
No.: MPP0518
March 2005
Version No.: 1.0

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DESCRIPTION OF SYMBOLS
DANGER This symbol indicates topics that could lead to death or serious injury if ignored or handled improperly.
WARNING This symbol indicates topics that may cause death or serious injury if ignored or handled improperly.
CAUTION This symbol indicates topics that may cause injury or damage on property if ignored or handled improperly.
This symbol indicates topics that may cause electric shock if ignored or handled improperly.
This symbol indicates to request connection of GND terminal to earth.
This symbol indicates topics that may cause injury like electric shock if opened.
This symbol indicates topics that may cause outbreak of fire or smoke if ignored or handled improperly.
This symbol indicates topics that may cause injury by poisonous materials to the human body included.
SAFETY INSTRUCTION
CAUTION
●The product should be operated with the specified voltage.
The operation with incorrect voltage may cause electric shock, or outbreak of fire or smoke.
●Do not put any liquid including water in the product that may cause electric shock.
●Do not put any item including metal in the product that may cause outbreak of fire by its short circuit.
CAUTION FOR INSTALLATION
CAUTION
●Do not install the main unit of the product at the location where it receives rainfall, water splash, humidity i
n
order to avoid possible machine trouble caused by them.
●Do not install the main unit of the product at the location where lots of direct sunshine or dust, vibration, shoc
k
that may cause possible machine trouble.
●If the compass safety distance is specified, install the product at the place apart from the compass by more tha
n
the specified distance.
If the compass safety distance is not specified, install the product at the place apart from the compass not to affec
t
more than 0.5 degree of its readout.
CAUTION FOR HANDLING
For the selection of location to install the product, please take the followings into your consideration.
For the handling of the product, please take the followings into your consideration.
WARNING
●Please be careful not to give any mechanical shock to LCD display.
●Handle it carefully not to break its glass. When the glass is broken, do not touch the liquid in it.
Particularly keep it away from mouth or eye. When you touch the liquid, wash it out with running water.
If you put it into your mouth or eye, rinse it away, then visit a doctor.
●Take care not to drop the antenna.
Please paint oily paint once a year to prevent the joint part of the Adcock antenna and a stanchion being corroded.
Note that the antenna might fall due to corrosion of antenna base and stanchion when leaving without paintin
g
there for a long time.
CAUTION
●Do not use organic solvent.
Do not use organic solvent like thinner or alcohol when wipe the product.
Please wipe the product with soft cloth (use neuter cleanser, and squeeze the cloth well) when it soiled.
SAFETY PRECAUTIONS

Instruction Manual of TD-L1630  Contents
Note on Safety
Chapter 1 GENERAL DESCRIPTION Page
1.1 INTRODUCTION ······································································································ 1
1.2 FEATURES ·············································································································· 1
1.3 COMPONENTS ········································································································ 2
1.4 NOTE ON USE ·········································································································· 2
1.5 SPECIFICATIONS ···································································································· 3
Chapter 2 OPERATION
2.1 KEYS AND CONTROLS
2.1.1 Front panel ·································································································· 4
2.1.2 Rear Panel ·································································································· 6
2.2 PREPARATION
2.2.1 Power ·········································································································· 7
2.2.2 Frequency memory ······················································································ 7
2.2.3 Mode Selection ···························································································· 8
2.2.4 Adjustment ·································································································· 9
2.3 RECEPTION AND BEARING MEASUREMENT
2.3.1 Operation - MANU ······················································································· 9
2.3.2 Operation – SPOT ······················································································· 10
2.3.3 Operation – SRCH ······················································································· 10
2.3.4 Operation – SCAN ······················································································· 10
2.3.5 One-touch reception ···················································································· 11
2.3.6 Bearing Measurement ················································································· 11
2.4 DATA OUTPUT ····································································································· 12
Chapter 3 INSTALLATION
3.1 ANTENNA
3.1.1 Antenna Site ······························································································· 13
3.1.2 Flange ········································································································· 15
3.1.3 Antenna Cable ····························································································· 15
3.1.4 Installation of Antenna ················································································· 16
3.2 MAIN UNIT ········································································································ 16
3.3 DESCRIPTION OF CIRCUIT
3.3.1 Antenna Circuit ··························································································· 17
3.3.2 Printed Circuit Assemblies ········································································· 17
3.4 PERFORMANCE CHECK AND REPLACEMENT
3.4.1 Test Equipment ··························································································· 19
3.4.2 Test Arrangements ······················································································ 19
3.4.3 Replacement and Re-adjustment ································································ 23
3.5 PROCEDURE OF PHASE ADJUSTMENT ······························································· 24
CONTENTS
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Instruction Manual of TD-L1630  Contents
Chapter 4 MAINTENANCE
4.1 MECHANICAL CHECK Page
4.1.1 Antenna ······································································································ 27
4.1.2 Main Unit ···································································································· 27
4.2 ELECTRICAL CHECK
4.2.1 Ni-Cd Battery for Backup Memory ······························································ 27
4.2.2 Fuse ··········································································································· 27
4.3 TROUBLE SHOOTING
4.3.1 Troubles and Countermeasures ·································································· 28
4.4 Remarks ··················································································································· 31
4.5 Disposal ·················································································································· 31
APPENDIX
Interconnection Diagram Drawing No.
Interconnection Diagram of Main Unit ····························· 323770
Block Diagram ································································· 043955
Circuit Diagram of Main Unit
PCA HF ··········································································· 332423
PCA IF/AF ········································································ 322824
PCA VCO-1 ····································································· 332424
PCA VCO-2 ····································································· 332425
PCA CPU ········································································ 323774
PCA NMEA ···································································· 343135
PCA Display ····································································· 323754
PCA LED ········································································· 342033
PCA Chopper ·································································· 342034
PCAAVR ········································································· 342035
PCA BM ········································································· 342036
PCA Noise Limiter ··························································· 342037
PCA Switch 1 ··································································· 333582
PCA Switch 2 ··································································· 333583
External Views
Main Unit ········································································· 020514
Speaker ·········································································· 042995
Power Unit (option) ·························································· 042662
Adcock Antenna
ii

Instruction Manual of TD-L1630  Contents
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Instruction Manual of TD-L1630 Chapter 1
1
Chapter 1 GENERAL DESCRIPTION
1.1 INTRODUCTION
VHF Automatic Digital Direction Finder (VHF ADDF) TD-L1630 is the succeeding model of TD-L1620A
adding the following functions with suitable structure for flush mount.
●User friendly operation panel - Single purpose switches are applied for function keys.
●One-touch reception of 121.5 MHz and CH16 by individual push button.
●Data output port (NMEA 0183, bearing data) is provided.
1.2 FEATURES
A) A wide frequency range from 110 MHz to 169.995 MHz.
B) computer-controlled synthesizer with a triple super-heterodyne circuit provides high sensitivity,
accuracy and stability. Thus, the unit is very suitable for stand-by reception.
C) A new tracking technique is adopted to give a high stability even receiving a weak signal with low
S/N ratio.
D) Holding function is provided to maintain the last bearing data while receiving no signal.
Bearing data is updated when receiving new signal regardless the holding function is on or off.
E) 4 modes in selecting the frequency are available as follows.
1. MANU mode : Manual frequency setting in 5 kHz step.
2. SPOT mode : Quick reception by channel selection. Max. 30 frequencies can be stored in
the memory.
3. SRCH mode : Search reception covers a frequency range, Fc ± 500 kHz, in 5 kHz step.
(Fc : center frequency)
4. SCAN mode : Automatic scanning reception of SPOT frequencies in group.
Max. 10 channels with the same group number can be scanned.
Scan stops and display bearing when a signal is received.
F) New electrical modulation system provides clear sound of a received signal even while direction
finding.
G) Two bearing indicators (36 pcs. of ring LEDs in 10° step, and digital LCD in 1° step) provides easy
and accurate homing.

Instruction Manual of TD-L1630 Chapter 1
2
1.3 COMPONENTS
A standard complete set is composed of the following items.
Item Quantity Remark
TD-L1630 main unit 1 11 ~ 35V DC
H type Adcock antenna 1 Model EA-351A
Accessories 1 set Power cable with a 3P plug (3 m), Speaker with
cable and plug (4Ω), Instruction Manual
Spare parts 1 Fuse (3A)
Installation materials 1 set Antenna cable (Twin coaxial, standard: RG-58A/U
16 m), cable clamper, earth wire (3 m), Tapping
screws, FB tape
1.4 NOTES ON USE
(1) Please read through this manual, and operate the TD-L1630 properly.
Mis-handling would cause deterioration of the performance and mis-erase of memory contents.
(2) The input voltage for the TD-L1630 is 11~ 35V DC.
When AC power supply is required, please use TG-1637CS or equivalent rectifier.
Please note that the sound clearness might decrease when the power supply with a large ripple is
used.
(3) The frequencies memorized in the memory are maintained with the built-in Nickel Cadmium
(Ni-Cd) backup battery.
The Ni-Cd battery is automatically re-charged while the power of the main unit is ON.
When the equipment is operated for the first time, not operated over one month or replaced the
Ni-Cd battery with the new one, keep the power “ON” for more than 15 hours to charge the
backup battery.
Data in memory would fade away when the Ni-Cd battery is completely discharged. In that case,
enter the data again after re-charge or replace the battery. It is recommended to note down the
memory data.
(4) Circuit boards in the equipment are firmly adjusted at our factory. Do not re-adjust Trimmer
Potentiometers on the circuit boards. Otherwise, adjustment might be improperly shifted and the
equipment would not work properly.
(5) Keep away the equipment from heat, humidity or strong shock. Otherwise, performance might
be deteriorated.
(6) Set the GAIN knob to maximum when measuring the direction of a received signal.
(7) The SW1 on PCA BM is used for special case such as installing on a aircraft. Normally it must be
set to “NOR” position.

Instruction Manual of TD-L1630 Chapter 1
3
1.5 SPECIFICATIONS
●Antenna (EA-351A)
Type : H type Adcock antenna
Antenna cable : Twin coaxial cable with armor
16 m or shorter : RG-58A/U
17 ~ 29 m : 5D-2V (option)
30 m or longer : 8D-2V (option)
●Receiving System
Receiving circuit : Synthesized triple super-heterodyne
Mode of reception : Manual, spot, search and scan
SPOT : Max. 30 channels in the memory
SRCH : Fc (center frequency) ± 500 kHz, in 5 kHz step
SCAN : Max. 10 SPOT channels in a group x 3 groups
One-touch reception : 121.5 International distress frequency
CH16 International VHF channel number 16
Frequency range : 110 ~ 169.995 MHz, in 5 kHz step
Mode of modulation : AM or FM (waveform : A3E or F3E)
Frequency resolution : 5kHz
Image rejection ratio : 60dB or more
Frequency stability : ± 10 x 10-6
Sensitivity : For DF mode, minimum field strength 0.5µV/m or less
For RCV mode, 2µV or less at 20 dB QS input
Selectivity : ± 6 kHz at –6dB or wider
±12 kHz at –60dB or narrower
●Output
Displays : Digital bearing display with LCD in 1° step
Direct bearing display with 36 pcs. of ring LED in 10° step
Audio output : 1W (impedance 4Ω)
Data output : NMEA 0183 (RS-422)
●Power Supply : 11 ~ 35V DC, 0.6 ~ 1.5A
AC Power Supply (TG-1637CS) is available on option (100/110/115/200/220/230V AC)
●Backup Battery : Built-in, Ni-Cd battery, rechargeable 3HB70-MX
●Size and Weight
Main unit : 332(W) x 165(H) x 327(D) mm, 8.2 kg
Adcock antenna : 410(W) x 930(H) x 410(D) mm, 3.4 kg


Instruction Manual of TD-L1630 Chapter 2
4
Chapter 2 OPERATION
2.1 KEYS AND CONTROLS
2.1.1 Front Panel
Fig.1 shows layout of keys and display devices on the front panel of TD-L1630.
Fig.1 Layout of keys and display devices on front panel

Instruction Manual of TD-L1630 Chapter 2
5
No. Name Functions
Ring display Relative bearing of a received signal is displayed in 10° step with 36 pcs. of LEDs
arranged in the circle.
Azimuth card True bearing can be read by rotating the azimuth card.
DEGREE display Relative bearing is displayed by numerals in 1° step.
It also shows entry condition with keyboard.
MEMORY display
The channel number of the memorized frequency is displayed.
Frequency display
A selected frequency is displayed in 5 kHz step.
Level indicator The signal strength is indicated with 10 LEDs.
Stronger electric field strength lights a lot of LEDs.
POWER switch Turn to “-“ position to power ON, and turn to “○” to power OFF.
DIMMER knob Rotate the knob clockwise to increase the brightness of LEDs and LCDs.
Also, pull the knob to illuminate a lamp on azimuth card.
VOLUME knob Rotate the knob clockwise to increase volume.
GAIN knob Rotate the knob clockwise to increase gain.
Please set gain maximum when measuring direction.
In SCAN or SRCH mode, it would be possible to receive only the strong signal (a signal
from short distance) by decreasing the gain.
SQUELCH knob Rotate clockwise to suppress noise when no-signal in AM and FM reception.
Note: Too much suppression may hinder reception of weak signal.
DF/RCV switch Press the button for DF mode, release it for RCV mode.
High sensitivity reception is possible at RCV mode, and direction finding is not possible
at RCV mode. In the RCV mode, nothing is indicated on Ring display and DEGREE
display.
FM/AM switch Press the button for FM reception, release it for AM reception.
HOLD button While it is ON, a bearing data is held until next signal comes.
MANU button Manual reception or, enter/renew a data by keyboard.
SRCH button Search over a frequency range, Fc (center frequency) ± 500 kHz in 5 kHz step.
SPOT button Call up a frequency with its channel number.
SCAN button Scan a group of frequencies (max. 10 frequencies in a group x 3 groups).
Scan stops when a signal is received. When the HOLD button is ON, bearing is
maintained until next signal reception.
CH16 button Press to receive international VHF channel number 16.
121.5 button Press to receive international distress signal 121.5 MHz.
F Frequency key. Enter a frequency. (MANU or SRCH mode)
M Memory key. Enter data in a memory. (SPOT, SRCH or SCAN mode)
+/- Up-down key.
Alter the number of frequency ascending or descending. (MANU or SRCH mode)
Change the 2nd digit of channel number when Memory key is ON.
S Start key. Use with a function key as follows.
Restart SRCH or SCAN. (SRCH or SCAN mode)
Change the frequency by 5 kHz step. (MANU mode)
Change the channel number by 1. (SPOT mode)
C Clear key to erase an erroneous input.
E Enter key to execute input command.
Keyboard
0 ~ 9 Numeric keys to enter number.

Instruction Manual of TD-L1630 Chapter 2
6
2.1.2 Rear Panel
Fig.2 shows layout of terminals on the rear panel of TD-L1630.
Fig.2 Layout of terminals on rear panel
No. Name Functions
DATA Data output terminal. See article 2.4 for the details of output data.
Fuse 3A Fuse holder contains a fuse MF60NR 250V 3A.
POWER Power connector for power cable.
SPEAKER Mini-jack to connect with a speaker (4Ω).
PHONE Mini-jack to connect with a earphone or headphone.
GND Ground terminal to connect to the ship’s ground terminal.
ANT left Antenna cable connector for M type connector.
ANT right Antenna cable connector for BNC connector.

Instruction Manual of TD-L1630 Chapter 2
7
2.2 PREPARATION
2.2.1 Power
(1) Confirm that a DC power 11V ~ 35V is supplied from a DC source.
If AC power source is supplied, use optional AC power supply unit TG-1637CS.
(2) Turn power switch on. All settings and adjustments at the last power off are restored.
For example, the unit starts and continues signal reception after power on with the same condition
as the unit was receiving before the last power off.
(3) Turn power switch off to terminate operation.
2.2.2 Frequency Memory
(1) Basic procedure to set a frequency (MANU mode)
A) Confirm that the MANU button is ON. If not, press MANU button.
B) Enter frequency, press F →Frequency, 6 digits →E
Note: Bearing display (DEGREE) blinks until E is pressed.
Example : Enter 136.740 MHz
F →1 →3 →6 →7 →4 →0 →E
Note: In case of mis entry, press C to clear, then enter the correct number.
Input frequency should be between 110.000 MHz and 169.995 MHz, 5 kHz step.
Erroneous input is not accepted.
Above procedures are rewritten as : MANU →F →Frequency, 6 digits →E
The unit starts reception when a frequency is set.
To set a frequency in step of 5 kHz when the unit is receiving a frequency in MANU mode.
Press S as many times as wanted. The frequency increases or decreases in step of 5 kHz.
(ascending or descending is selectable by pressing +/- key.)
(2) Enter the frequency in a memory
After setting a frequency by procedure (1), press M and set a channel number in the order of a
group number and a last digit, and finally, press E to enter the frequency in the memory
channel.
The basic procedures to enter a frequency in a memory channel is rewritten as:
MANU →F →Frequency →E →M →+/- →Last digit →E .
Note: There are 3 groups, with group numbers, 0, 1 and 2.
A channel number consists of a group number and a last digit.
For example, a channel number “26 “has a group number “2” and a last digit “6”.
136.74013.674
. 1 1.367.136. 13

Instruction Manual of TD-L1630 Chapter 2
8
(3) Memory of a frequency in SRCH mode
When an interesting frequency is found in SRCH reception, hold that frequency by pressing
HOLD and enter it into the memory with a channel number by following procedures.
HOLD →M →+/- →Last digit →E .
(4) Enter a new SPOT frequency in an existing memory channel
Set a new frequency and enter the frequency to the memory channel. The old data is canceled by
overwriting.
(5) To erase all SPOT frequencies in the memory
A) Turn power switch off once.
B) Turn power switch on while pressing M , all frequencies in the memory are erased.
2.2.3 Mode Selection
(1) Select a mode of reception and a mode of modulation
A) Select the mode at first, MANU, SPOT, SRCH or SCAN, and press the key.
B) Check the mode of modulation, FM or AM. Press or release the FM/AM key when necessary.
(2) Select DF/RCV (this selection may be changed while in operation)
Reception only (RCV mode) is selected when release the DF/RCV key. DF mode is selected
when it is pressed, and both reception and bearing measurement are available. RCV mode is
usually selected when the level of signal is too weak to measure the bearing or wish to hear the
voice sound much clearly.
(3) Select HOLD (this selection may be changed while in operation)
There are two functions for hold, one is to keep the bearing data while there is no signal in MANU
or SPOT mode, and the other one is to lock the frequency in SRCH or SCAN mode.
A) Bearing data in MANU or SPOT mode (the frequency does not change)
When there is no signal, the bearing output fluctuates. When a signal is received,
instantaneous bearing data is displayed (data is continuously updated).
When the signal stops and HOLD is off, the bearing output fluctuates widely.
When the signal stops and HOLD is on, the bearing output keeps the last received data until
another signal comes.
B) Bearing data and frequency in SRCH or SCAN mode
When there is no signal, the bearing output fluctuates and frequency is automatically swept.
When a signal is received, frequency change stops and instantaneous bearing data is
updated every second.
When HOLD is off and the signal stops, the unit automatically restarts SRCH or SCAN sweep
and bearing output fluctuates.
When HOLD is on and the signal stops, the bearing output keeps the last data until another
signal comes and the frequency is locked. When another signal comes at that frequency, the
bearing data is updated. To restart SRCH or SCAN, press S .

Instruction Manual of TD-L1630 Chapter 2
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2.2.4 Adjustment
(1) DIMMER
When the DIMMER knob is pulled, the azimuth card is illuminated. Rotate the knob clockwise to
raise brightness of LEDs and LCD.
(2) VOLUME
Rotate the volume clockwise to increase the loudness of the speaker.
(3) GAIN
Rotate the GAIN knob to elevate RF sensitivity.
(4) SQUELCH
Rotate the SQUELCH knob clockwise to suppress the audio noise when there is no signal.
(5) AZIMUTH (should be adjusted for true bearing measurement)
Rotate the AZIMUTH card according to the reading of the compass on board. The reading of LED
to the AZIMUTH card gives the true bearing of the radio signal. Since azimuth setting is manual,
AZIMUTH card should be rotated according to the compass reading when true bearing is required.
2.3 RECEPTION AND BEARING MEASUREMENT
2.3.1 Operation – MANU
(1) Basic procedure for manual reception
Confirm that MANU is ON. If not, press MANU key. Set a frequency and receive.
F →Frequency, 6 digits →E .
Note: a) When F is pressed, 000 blinks in DF mode at the bearing display (DEGREE).
b) The first digit should be 1, the second should be 1,2,3,4,5 or 6, and the last one should
be 0 or 5.
c) When an incorrect number is entered, press C and enter correct number.
d) The relative bearing is displayed in DF mode when a signal is received.
e) When there is no signal and HOLD is OFF, bearing data fluctuates.
f) When there is no signal and HOLD is ON, last bearing data remains.
(2) Change to another frequency in 5 kHz step while receiving in MANU mode.
S or +/- →S
Note: Press S as many times as necessary.
A press of +/- ascends/descends the frequency.

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2.3.2 Operation – SPOT
(1) Basic procedure for spot reception
Confirm that SPOT is ON. If not, press SPOT key. Call up a channel and receive.
M →+/- →Last digit →E
Note: a) When M is pressed, 000 blinks in DF mode at the bearing display (DEGREE).
b) The relative bearing is displayed in DF mode when a signal is received.
c) When there is no signal and HOLD is OFF, bearing data fluctuates.
d) When there is no signal and HOLD is ON, last bearing data remains.
(2) Change to another channel in the same group while receiving in SPOT mode.
Press S as many times as necessary.
2.3.3 Operation – SRCH
(1) Basic procedure for search reception
Confirm that SRCH is ON. If not, press SRCH key. Set a center frequency, Fc.
When E is pressed, searching starts in step of 5 kHz in the range of Fc ± 500 kHz.
F →Center frequency, 6 digits →E
(2) Reverse the frequency sweep, press +/- .
(3) When a signal is received and frequency search stops, press S several times to find a
frequency at which the level indicator shows maximum.
(4) When an interesting frequency is found in SRCH reception, store it in a memory channel by
following procedure. HOLD →M →+/- →Last digit →E
(5) When HOLD is on, incoming signal locks frequency search. To restart search, press S .
2.3.4 Operation – SCAN
(1) Set SCAN mode
Confirm that SCAN is ON. If not, press SCAN key.
When SCAN mode was selected at the last power off, SCAN restarts when the power is turned on.
(2) Check the group number. To change the group number, operate key as following.
Press +/- a few times: M →+/- →E
(3) When HOLD is on, incoming signal locks frequency scan. To restart scan, press S .
(4) SCAN pass
When a frequency is not necessary to be scanned while it is being received, following procedure
restarts scanning and that frequency is skipped from the next scan: M →E →S
(5) A frequency returns to be scanned again from being scan-passed, enter the last digit of its channel
number by following procedure. M →Last digit →E

Instruction Manual of TD-L1630 Chapter 2
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2.3.5 One-touch reception
There are tow one-touch reception button.
(1) Press 121.5 (red button) to receive international distress signal 121.5 MHz.
FM mode is automatically selected regardless the condition of FM/AM switch.
(2) Press CH16 (blue button) to receive international VHF channel 16.
AM mode is automatically selected regardless the condition of FM/AM switch.
This one-touch reception is effective at any time after power switch ON.
2.3.6 Bearing Measurement
(1) Bearing data relative to the bow direction is displayed while a signal is being received both on the
digital display in 1° step and on the ring display in 10° step.
(2) The relative bearing is updated every second, and a displayed value is an averaged one over a
second.
(3) When the true bearing (relative to the North direction) is necessary, read the bow direction on the
compass and rotate the azimuth card. Then the true direction is shown on the azimuth card.
Digital true bearing is calculated as the sum of the bow direction and the relative bearing.

Instruction Manual of TD-L1630 Chapter 2
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2.4 DATA OUTPUT
There is a data output terminal on the rear panel to output frequency and bearing of received signal.
Pin assignment of data output terminal (connector: PRC04-21A16-14M)
Pin number Name of signal Signal contents Data format Interface
A OUT 1 + output NMEA0183 RS-422
B OUT 2 - output NMEA0183 RS-422
C ~ N Not used - - -
Specification of interface
Baud rate 4800 bps
Data bit 8 bit
Parity Non
Start bit 1 bit
Stop bit 1 bit
Forwarding data ASCII
Data format
Number Name of data Description Bite
1 Start code {$} 1
2 Device name {DF} 2
3 Sentence name {BRG} 3
4 Comma {, : HEX code 2C} 1
5 Comma {, : HEX code 2C} 1
6 Frequency 110,000,000 ~ 170,000,000 Hz 9
7 Comma {, : HEX code 2C} 1
8 Comma {, : HEX code 2C} 1
9 Bearing 000 ~ 359 deg 3
10 Comma {, : HEX code 2C} 1
11 Relative bearing {R} 1
12 Comma {, : HEX code 2C} 1
13 Comma {, : HEX code 2C} 1
14 Status {A : Valid, V : Invalid} 1
15 Comma {, : HEX code 2C} 1
16 Asterisk {* : HEX code 2A} 1
17 Check sum 00 ~ FF 2
18 End code {CR : HEX code 0D} 1
19 End code {LF : HEX code 0A} 1








Note: Check sum field is xOR of all 8 bit characters, and include {,} between {$} and {*} ({$} and {*} are excluded).
The value of the hexadecimal notation in four high rank bits and four subordinate position bits of the result is
converted into two ASCII characters
(
0-9,
A
-F
)
and transmitted.
$DFBRG,,XXXXXXXXX,,XXX,R,,X,*XX<CR><LF>
Frequency
Sentence name
Device name
Start code
Check sum End code
Asterisk
Status
Relative bearing
Bearing

Instruction Manual of TD-L1630 Chapter 3
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13
Chapter 3 INSTALLATION
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3.1 ANTENNA
3.1.1 Antenna Site
Following instructions shall be noted for antenna installation to minimize disturbance on direction
measurement, since the performance of a short wave direction finder is vulnerable to the influence of
conductive bodies nearby. (e.g., upper structure, stay cables, derricks and other antennas.)
(1) The separation between the Adcock antenna
and the keel line shall be minimized.
(2) The top of the fore mast, radar mast or the
highest possible position is recommended to
install the Adcock antenna.
(3) The Adcock antenna shall be situated 2m or
higher from the TX/RX main antenna. Make
the horizontal separation larger than 2m from
the main antenna by inserting insulators.
The separation of Adcock antenna and the
navigation lamp shall be larger than 1m.
(Refer to Fig. 3 - A)
(4) The Adcock antenna shall be 1m or higher
than radar antenna and the horizontal
separation from a tip of radar antenna shall
be 0.8m or more. (Refer to Fig. 3 - B)
(5) Keep a horizontal separation of 2m or more
and vertical separation of 1m or more from a
perpendicular metallic object (metallic mast,
pole, etc.). If there is a metallic object
higher than the Adcock antenna, keep a
horizontal separation of 5m or more.
(Refer to Fig. 3 - C)
(6) When wire stays are used for the stanchion,
insert insulators 1m from the stanchion.
(Refer to Fig. 3 - D)
(7) When whip antenna or like is close to the
Adcock antenna, keep a vertical separation of
1m and a horizontal separation of 4m. When
such separation is impossible, tilt the whip
antenna. (Refer to Fig. 3 - E)
1m or more
0.8m or
more
Radar
scanner
Fig. 3 - B
Fig. 3 - C
1
m or
more
0
.75m or more
I
nsu
l
ator
S
tay w
i
re
Fig. 3 - D
1
m or more
4m or
more
Whi
p antenna
Fig. 3 - E
2m or more
Insulator
2m or more
TX/RX main
antenna
Fig. 3 - A
Navigation
lamp
2m or more
1m or
more
2
m or
more
5m or
more
Perpendicular
metallic object