Alpermann+Velte AV-MTD G 30 TTT User manual

Operating Manual
Version: 3.5
February 4, 2011
LTC generators + central units of the
MTD Time-Timer-Time-Code System
AV-MTD G 30 TTT

Operating Manual AV-MTD G 30 TTT
TABLE OF CONTENTS Page
A1 SAFETY INSTRUCTIONS
A2 COPYRIGHT
A3 CE-DECLARATION
FUNCTIONS OVERVIEW 1
REAR PANEL AND SPECIFICATION 2
DESCRIPTION OF KEYS 3
THE 8-DIGIT DISPLAY AND THE LEDS 4
DESCRIPTION OF THE MENU LINES 5
USER BITS MODE 7
OFFSET TO REFERENCE TIME INPUT 8
STORED DATA AND FACTORY SETTINGS 9
AFTER POWER-ON 11
RECEIVING “REAL-TIME“ VIA DCF77 OR GPS 12
OPTION: VITC GENERATOR 13
OPTION: RECEIVING “REAL-TIME“ VIA LTC INPUT 14

Operating Manual AV-MTD G 30 TTT
A1 Safety Instructions
General rules: Only use the device as directed in a dry atmosphere. Treat the AV-
MTD G 30 TTT with the same care as other studio devices. Please
follow the advice in the following operators manual.
Damages in transit: If the device shows obvious damages from transit the shipper in
question must be notified and the dealer must be informed.
Positioning: Position device only where sufficient air circulation can be
maintained. Extreme temperatures, dust, humidity, shocks and
strong electromagnetic fields must be avoided.
Maintenance: Use a moist soft textured fabric cloth when cleaning the housing. Do
not use polish or any other cleaning agents.
Repairs: The AV-MTD G 30 TTT does not require any extra maintenance.
There are no user serviceable parts inside the device. Repairs should
be sent to an authorized service partner.
EMC: The EMC regulations are observed only under the following
condition: use high quality shielded cables at data inputs and
outputs.
A2 Copyright
No part of this publication may be reproduced, translated into another language, stored in a
retrieval system, or transmitted, in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise without the prior written consent of Alpermann+Velte
Electronic Engineering GmbH. Technical changes are reserved. All brand and product names
mentioned herein are used for identification purposes only, and are trademarks or registered
trademarks of their respective holders.
Information in this publication replaces all previously published information. Alpermann+Velte
Electronic Engineering GmbH assumes no responsibility for errors or omissions. Neither is any
liability assumed for damages resulting from the use of the information contained herein.
Whenever it is likely that safe operation is impaired, the instrument must be made inoperative
and secured against unintended operation. The appropriate service authority must then be
informed.
Copyright © Alpermann+Velte Electronic Engineering GmbH 1999-2000. All rights reserved.
For further information please contact your local dealer or:
Alpermann+Velte
Electronic Engineering GmbH
Otto-Hahn-Str. 42
D-42369 Wuppertal
Phone: ++49 - (0)202 – 244 111 0
Fax: ++49 - (0)202 – 244 111 5
E-Mail: [email protected]
Internet: http://www.alpermann-velte.com

Operating Manual AV-MTD G 30 TTT
A3 CE Declaration of Conformity
We,
Alpermann+Velte
Electronic Engineering GmbH
Otto-Hahn-Str. 42
D-42103 Wuppertal
herewith declare under our sole responsibility that the
G 30 TTT
meets the intent of the following directives, standards and specifications:
89/336/EEC Electromagnetic Compatibility
EN 50081-1 Emissions
•EN 55022
•EN 55103-1
EN 50082-1 Immunity
•EN 55024
•EN 55103-2

Operating Manual AV-MTD G 30 TTT
Page 1
Functions Overview
Alpermann+Velte has developed a system for Multiple Time Displays (MTD). A MTD system
consists of a central generator unit, digital displays and/or analogue clocks, and user
console(s). The central generator unit outputs a special LTC format. This LTC will henceforth
denoted as LTC(MTD). The LTC(MTD) represents the data link to all the digital displays, and it
contains real-time, date and user selectable timers.
G 30 TTT is a central generator unit of the MTD system. The generated LTC is externally
locked to video (CVBS or black burst). Alternatively if there is no external sync source, LTC is
internally synchronised via a crystal. Integrated components are an LTC reader, a RS485 serial
interface and the balanced LTC output.
The time information of the generated LTC may be selected as:
•real-time,
•identical to the LTC of the built-in reader,
•identical to the time E (in the MTD timer system),
•continuing from a start value.
The selection is made by pressing a button on the front of the unit.
The user bits of the generated LTC(MTD) contain real-time and date, six independent times
A...F (e.g. stop watches or the time of the readout LTC), and status data. These data are
destined for a MTD timer system. With this system, all times may be displayed and operated.
Operational units (MTD-BE or MTD-BTK) communicate with the G30TT via the RS485 serial
interface.
For operation in a non “MTD system” the way to process the user bits can be changed. For
example generating a “Real-time” LTC the time equals to the local time and the user bits carry
the date (different formats selectable).
All settings of the G 30 TTT as well as of the MTD system – (i.e. settings that have been made
via a MTD user console)- will be stored permanently, even when the G 30 TTT is switched off.
The standard options for the G 30 TTT are as follows:
•DCF77 or GPS reception by built-in receiver,
•DCF77 or GPS reception by external receiver,
•colour framing according to 4-field or 8-field (8-field uses the white flag in line 7 of a
black burst),
•GPI = settable trigger of a built-in relay by time A or B of the MTD system.
Further options may be built in if required. Example of special options:
•Receiving a “real-time“ from an LTC, i.e. a second built-in LTC receiver simulating a
DCF77 or GPS reception.
•Having a DCF77 and GPS receiver built-in. One of both can be activated by menu
selection.
•Converting Central European Time (CET/CEST) to UTC.
•Receiving CET/CEST by writing UTC into time E.
•VITC generator.

Operating Manual AV-MTD G 30 TTT
Page 2
Rear Panel and Specification
off
1
41
23
12
3
2 1
3
1
1
off
DSUB9F
XLR4M
XLR3M XLR3F
DSUB9F
DSUB9M
BNC insul./SMA
BNC
In
Loop
Antenna
LTC In (optional)
LTC Out
DC In
on/off
Data Out:
1: RS485 TRA
2: RS485 TRB
3: LTC_1
4: LTC_2
5: GND
BNC
75Ohm
on
BNC
Option
Power In:
1: GND
4: DC In
12-18V DC
max. 500mA
LTC Out:
1: GND
2: LTC_1
3: LTC_2
balanced, 1Vpp
LTC In:
1: GND
2: LTC_1
3: LTC_2
balanced
50mV - 5V
20-30 frames/sec
GPI
(Option):
1: NC1
2: NO1
3: COM1
DCF77/GPS
Data In:
2: RxD
5: GND
DCF77/GPS
Antenna
Option VITC:
Video+VITC Out
Video In
Loop Out
Video In: 1 Vp-p, CVBS or black burst. For V8 colour framing there has to
be the white flag in line 7.
DCF77 antenna: Meinberg type
DCF77/GPS serial data: RS232, 2400/7/E/2
GPI: relay contacts between COM1 and NC1 (normally closed). At
trigger for approx. one second contact closure between COM1
and NO1 (normally open).
Max. breaking capacity: 5 W
Max. turn-on voltage: 175 V
Max. switching current: 0.25 A
Max. main current: 1 A
Housing: ½ 19“, 1 U, 214 (W) x 43 (H) x 262 (D) mm
Weight: 2.0 kg (approx.)
Operating temperature: 5 °C to 40 °C
Permissible humidity: 35 % up to 85 %
With the special option “receiving real-time from an LTC“ there is neither a DCF77 antenna
connection nor a DCF77/GPS data connection, instead, a second XLR socket is installed as
LTC input.

Operating Manual AV-MTD G 30 TTT
Page 3
Description of Keys
real-time The time information of the LTC is generated identical to the “real-time“. “Real-
time“ is an internal clock, which is regulated by the built-in or external DCF77 or
GPS receiver, or by external operation (MTD user console). After switching on the
G 30 TTT the clock starts at 00:00:00:00. See also chapter “Receiving real-time...“
and “Description of the menu lines”.
ltc The time information of the LTC is generated identical to the readout LTC. LTC is
readable within a range of 20-30 frames/second, backward and forward (also
“still“ LTC if the output frequency is within a range of 20-30 frames/second). The
generated LTC will always be in forward direction. Drop-out compensation of one
frame is provided, after that the generated LTC stops.
The generated LTC is always locked to the video or to the crystal time base
respectively. If readout LTC and generated LTC are locked to the same video and
the readout LTC is at play speed “forward“, a continuous “jam sync“ is made, i.e.
a regeneration of the readout LTC without time jumps.
E The time information of the LTC is generated identical to the time E of the MTD
system. The time E can be a up-counting, a down-counting or still time, e.g. as a
stop timer or as a lap time or as an offset to the readout LTC or to the real-time.
The “colour framing“ function is not applicable in this mode. The LTC is
generated in “forward“ direction only (i.e. a plus or minus sign cannot be set). The
time information is generated in a way that, after adding one frame, an LTC
reader will display the time identical to that of an MTD display unit with display
mode = frame format. The 8-digit display of the G 30 TTT displays the values just
like an LTC reader ( i.e. adding one frame to the generated time).
start Free-running operating mode: when this mode is initiated, the unit simply switches
to a free-running counter. If this key is pressed again, the time information of the
LTC switches to the current start value (set key) and will then be counted on
continuously.
set Serves to display or input a start value, the select LED lights up. First the actual
start value is displayed. Alterations can be made using the keys hours, minutes,
seconds and frames.
Pressing the set key again quits the set mode and stores alterations.
cf Serves to switch on/off colour framing mode, only with built-in option and with
frame rate = 25. The V4 LED lights up if colour framing according to V4 has been
reached, the V8 LED lights up if colour framing according to V8 has been
reached. The V4 LED flashes if colour framing has been selected but cannot be
reached (e.g. if no video has been connected or the Ekey has been pressed).
enter Switches on the status display, see chapter “After power-on“. Functions during
menu switched on will be explained in chapter “Description of the menu lines“.
menu Displays the menu lines, see chapter “Description of the menu lines“.
select During menu switched on: selects the menu lines.
After long key press if menu is switched off: switches between the way of using the
user bits. Either the LTC(MTD) is generated to operate within the MTD system or
the user bits contain the manually set values or the date - according to the
selection at the menu (see chapter “User bits mode”).

Operating Manual AV-MTD G 30 TTT
Page 4
The 8-Digit Display and the LEDs
The 8-digit display generally displays the time information of the generated LTC as “hours
minutes seconds frames“. With the operating mode “time E“ (Ekey) one frame will be added
to the generated value. Pressing the set key or menu key the display switches to display
special data or text, pressing the enter key the status of the unit will be displayed (see chapter
“After power-on“).
Whenever data are written into the non-volatile memory - by using the keys of this unit or via
commands from a connected MTD user console -, the display will indicate “Store“ for a
moment. This indication will not disturb any current operation.
LED Function
menu Lights up while a menu line is displayed.
select Lights up while the start value or the trigger time (GPI) is displayed.
Goes out after pressing the set key.
Flashes if G30TTT does not generate the LTC(MTD), in that case the user bits are
used for example as date instead of transferring data for the MTD system.
free Lights up if the DCF77 or GPS receiver is not synchronised or not connected or not
built in. Will remain extinguished if the DCF77 or GPS receiver is synchronous to
the antenna signal.
mod. Flashes in the rhythm of data reception of a DCF77 or GPS receiver (once each
second).
field Only with built-in DCF77 receiver: indicates the field strength of the antenna
signal.
V4 Flashes if colour framing (cf key) has been activated, but can not be executed (e.g.
if no video is connected or the Ekey has been pressed). Lights up if the LTC is
locked according to the 4-field sequence. The 4-field sequence is derived from the
video signal or from the black burst at BNC Video In.
V8 Lights up if the LTC is locked according to the 8-field sequence. The 8-field
sequence is derived using the white flag at line 7 of the video or black burst signal.
jam Lights up as long as an LTC can be read, irrespective of the ltc key.
video Lights up if the LTC is locked to the video (connect video or black burst at BNC
Video In).
real-time Lights up during the “real-time“ operating mode, real-time key.
ltc Lights up during the “LTC“ operating mode, ltc key.
E Lights up during the “time E“ operating mode, Ekey.
start Lights up during the “start time“ operating mode, start key.

Operating Manual AV-MTD G 30 TTT
Page 5
Description of the Menu Lines
Pressing the menu key switches the menu lines on or off. After power-on the last selected
menu line is displayed (the menu LED lights up). A menu line serves to indicate actual settings
or executable functions. Pressing the select key all menu lines may be displayed cyclically,
pressing the enter key the indicated settings may be altered or functions may be executed.
Menu line Description
LOCK OFF (ON) Key-lock off (on).
Key-lock “on“ means that all keys except the menu and enter key are
without function. This way the generator cannot be switched
inadvertently.
Switch between ON and OFF by pressing the enter key.
U Store Pressing the enter key all current settings (including settings made via
an external MTD operational unit) may now be stored in a “user“
storage area; see also chapter “Stored data and factory settings“.
During the backup Store is displayed, afterwards U Store is displayed
again. This process will not disturb any current operation of the
generator.
U Load Pressing the enter key calls the settings of the “user“ storage area, see
also chapter “Stored data and factory settings“.
Attention: This action will restart the G 30 TTT just like a power-on!
U reset Pressing the enter key resets the “user“ storage area to the standard
values (factory settings), see also chapter “Stored data and factory
settings“. During the backup Store is being displayed, afterwards U
reset is displayed again. This process will not disturb any current
operation of the generator.
GPI A0 Display and alteration of settings of the relay trigger:
A0 = trigger at time A, inactive.
A1 = trigger at time A, active.
B0 = trigger at time B, inactive.
B1 = trigger at time B, active.
Pressing the enter key calls the alteration set mode, the select LED
lights up ( only with built-in option “GPI“). Then, the display will
additionally display the actual trigger time.
The hours key alters the hours of the trigger time,
The minutes key alters the minutes of the trigger time,
The seconds key alters the second of the trigger time,
The frames key switches between A0 A1 B0 B1.
The set key terminates the programming and stores the new setting.
If the GPI is inactive or not triggered, the contacts COM1 and NC1 are
closed. If the time (A or B) assigned to the GPI matches the selected
(trigger) time and GPI is set active, then COM1 closes to NO1 for
approx. one second.

Operating Manual AV-MTD G 30 TTT
Page 6
F reset Pressing the enter key the factory settings will be stored in the backup
memory and in the actual area.
Attention: This action will restart the G 30 TTT just like a power-on!
REAL on (off) Pressing the enter key will switch between on and off.
On means: time and date of the (built-in or external) DCF77 or GPS
receiver will be accepted, i.e. every second the “real-time” of the MTD
user bits will get its update. During the operating mode “real-time” of
the generator the LTC time will update once a day or after pressing key
real-time.
Off means: time and date of the (built-in or external) DCF77 or GPS
receiver will not be accepted, the status LED’s at the front however
remain valid. Time and date now may be set using a MTD user console.
Pressing key real-time will transfer the time of the internal clock
(identical to the time of the MTD user bits = real-time) to the LTC time.
HOUr 00 (..23) Pressing the enter key will select an hour out of 00 - 23. In the “real-
time“ operating mode (key real-time) this will be the hour at which the
LTC generator automatically synchronizes to the time of the GPS or
DCF77 receiver. This happens once a day, and a frame discontinuity
may occur. So this event should be chosen to happen at a time - mostly
at night - where it causes no further problems. The standard setting is =
03. The hour has to match with the reference input time of the GPS or
DCF77 receiver, i.e. whenever G 30 TTT detects this hour anew from the
reference input time, the synchronization occurs.
FrAM Pressing the enter key will switch between different frame rates. This
selection changes the internal free-run oscillator, the generation of the
LTC time information and the way of counting the MTD times A...I.
Frame rate = 24: Not usually used
Frame rate = 25: Standard setting. In free running mode (without
locked to video) and in case of video lock in the
television system 625/50 (PAL).
Frame rate = 30: In free running mode (without locked to video).
Frame rate = 3d: 30 drop mode: in case of video lock in the
television system 525/60 (NTSC).
USER (SET, TTT ...) Shows the pre-set of the user bits mode. Change the mode with key
enter (see chapter “User bits mode”). After a long press at key select -
while the menu is switched off - the user bits mode can be switched
between “TTT” (i.e. LTC(MTD) will be generated) and the mode selected
at this menu.
OFFS off (±
±±
±01..23) An offset (full hours) may be added to the reference time input. With key
enter select off or 01 ... 23 or -01 ... -23 (see chapter “Offset to
reference time input”).

Operating Manual AV-MTD G 30 TTT
Page 7
User Bits Mode
Basically G30TTT generates the LTC(MTD), i.e. the user bits carry data for the use of the MTD
system. But it is also provided to switch the user bits mode. In principle three basic modes can
be defined:
•Generating LTC(MTD): data for the use of the MTD system.
•Manually set values, once set they remain fixed.
•Date: different formats are available to set the day/month/year into the user bits.
In the menu (line USER (SET, TTT ...)) the user bits mode can be pre-selected. Key enter
switches between the following modes:
USER SET The manually set values will be generated, see below.
USER TTT LTC(MTD) will be generated: data for the use of the MTD system.
USER 2 Date of format s8s7DD MM YY.
USER 3 Date of format S2S1DD MM YY. S1and S2are status data:
S1, bit 0: set to 1, if the status data of the DCF77/GPS receiver indicate
lock (receiver synchronises to the antenna signal).
S1, bits 1/2: current time zone: 0/0 = UTC, 1/0 = CET, 0/1 = CEST.
S1, bit 3: set to 1, if the status data of the DCF77/GPS receiver indicate a
Daylight Saving Time switching.
S2, bit 0: not used.
S2, bit 1: Millennium bit, =1 if year ≥2000.
S2, bit 2: not used.
S2, bit 3: not used.
USER 4 Date of format according to EBU Technical Information I29-1995 (BBC format).
USER 5 Date of format DD MM YY YY (year = four digits).
USER 6 Date of format YY MM DD s2s1.
USER 7 Date of format s8s7YY MM DD.
USER 8 Date of format s8Y YM MD Ds1.
USER 9 Date of format DD MM YY s2s1.
s8s7s6s5s4s3s2s1represents the manually set user digits. Some of these digits may appear
together with the date, if the date does not use the complete 8 user digits.
Pressing key set at this menu line the user bits set mode switches on. The display switches to
show the last set values. Using keys hours, minutes, seconds and frames the values can be
changed manually. Key set pressed again quits the set mode and stores the new values.
The selection at this menu serves as a pre-set. Basically G30TTT generates the LTC(MTD). After
a long press at key select - while the menu is switched off - the user bits mode can be
switched between “TTT” (i.e. LTC(MTD) will be generated independent from whatever has been
selected at the menu) and the mode selected at this menu:
•LED select off: LTC(MTD) will be generated, all functions of the MTD system are available.
•LED select flashes: the user bits are of format according to the selection at the menu. The
MTD system does not work.
Example: With selection “USER 2“ at the menu and LED select off, the unit generates
LTC(MTD). If the LED flashes the unit generates the date according to format 2. With selection
“USER TTT“ at the menu, the unit generates LTC(MTD) always, the key select cannot switch the
mode.

Operating Manual AV-MTD G 30 TTT
Page 8
Offset to Reference Time Input
The reference time comes from an external or built-in GPS or DCF77 receiver. Now it is
possible to create a time zone selecting a full hours offset.
OFFS off: The reference time input will be accepted without any offset calculation. The
LTC(MTD) transfers this time and date information in the user bits (data multiplex), so it can be
decoded from MTD displays at mode 2 (real-time) and 3 (date). If the “real-time“ mode of the
generator is switched on (LED real-time at G30TTT lights up) the generator will synchronise
once a day its internal clock and the LTC time information with the reference time. Pressing
key real-time this synchronisation can be achieved manually at any time.
OFFS 01 (... 23, -01 ... -23): This switches on the offset calculation. The reference time will
be calculated plus or minus the selected value of hours (01 ... 23). The result will be treated as
the new reference time for the synchronisation and for the real-time and date of the
LTC(MTD). If necessary the date will be corrected by plus or minus one day.
If the “real-time“ mode of the generator is switched on (LED real-time at G30TTT lights up) the
result of the offset calculation will be shown at the front display and will be generated as the
time information of the LTC.
Independent of having switched on or off the “real-time“ mode the result of the offset
calculation will be coded in the user bits of the LTC(MTD), so any MTD display at mode 2
(real-time) and 3 (date) shows the result of reference time ±offset.
Remark
If the „real-time“ mode of the generator is switched on (LED real-time at G30TTT lights up)
please proceed as follows:
•Change the offset using key enter.
•Switch menu off.
•Press key real-time, now the time of the LTC and the time display at the front will show
the result of the new offset calculation.

Operating Manual AV-MTD G 30 TTT
Page 9
Stored Data and Factory Settings
Settings which have been made via G 30 TTT or via a MTD user console will be stored. In
detail these settings are as follows:
Settings via G 30 TTT Factorysettings
•Start value (hours, minutes, seconds, frames) 00:00:00:00
•Operating mode = real-time, ltc, Eor start key real-time
•colour framing on/off, cf key off
•key-lock LOCK on/off off
•GPI active/inactive and at time A/B, trigger time 00:00:00 A0
Settings via MTD user console A B C D E F H I LTC
display format (1-8) 1 1 1 1 1 1 7 1 1
hyphen (colon, dec. point, off) : : : : : . .
leading zeros on (1)/off (0) 0 0 0 0 0 1 0 0 1
leading zeros at zero on (1)/off (0) 0 0 0 0 0 0
flashing with negative on (1)/off (0) 0 0 0 0 0 0
function selection (UP/DOWN/DIFF...) UP UP UP UP UP OFFSET
TC
Offset 0 0 0 0 0 0
down stop (0) or down overflow (1) 1 1 1 1 1 1
For more details see operating instructions of the MTD system.
These data may be written altogether into in different storage areas. The storage areas are
organised as follows:
Area “F“: factory settings of G 30 TTT. These non-erasable data are stored in the PROM.
Area “S“: backup memory saving any alteration made during current operation. The data
are stored in an EEPROM (i.e. that they will be available when switching on
again).
Area “U“: user area, permits to store separately a complete system setting. These data
are stored in an EEPROM as well.
Area “W“: working area for current operation. RAM area which changes with new
settings.
RESET: "W"
POWER ON:
USER RESET: "U""F"
EEPROM
STORE + READ
PROM
"F"
"S"
FACTORY
SETTING
READ ONLY
"F"
"S"
"W"
"S"
SAVE
AREA
RAM
"W"
WORKING
AREA
RANDOM
USER STORE:
USER LOAD:
"U"
USER
AREA
"W"
"U"
"U"
"W"
The diagram above shows the storage areas and processes:

Operating Manual AV-MTD G 30 TTT
Page 10
1. After power-on “S“ will be transferred to “W“ if all data in “S“ are reasonable.
2. In case of a storage failure “S“ will be overwritten with “F“, then continued as in 1.
Functions 2. and 1. will also be executed in the F reset menu function.
3. When in the menu function user store, the actual data may be stored separately.
4. When in the menu function user load, the actual setting may be overwritten with the stored
setting.
5. When in the menu function user reset, the user area is overwritten with the factory settings.

Operating Manual AV-MTD G 30 TTT
Page 11
After Power-On
After power-on the last stored data will be tested. In case of a storage failure a “reset“ is
made, with the display indicating reset. After that, or in case of valid data, status reports are
indicated in two steps, and all status LED’s are lit up.
Status 1:
Digit 8 Digit 7 Digit 6 Digit 5 Digit 4 Digit 3 Digit 2 Digit 1
Digits 8, 7 and 6 indicate the type of the unit.
Digits 5 and 4 indicate a special version; with standard version these digits are blank.
Digit 3 indicates the frame rate of the system: blank = 25 (standard),
4 = 24,
3 = 30,
d = 30 Drop.
Digits 2 and 1 indicate the revision of the installed firmware.
Status 2:
Digit 8 Digit 7 Digit 6 Digit 5 Digit 4 Digit 3 Digit 2 Digit 1
Digit 8: =1 if the LTC reader (software) is built in, otherwise =0.
Digit 7: =1 if the option GPI is built in, otherwise =0.
Digit 6: =1, if the option DCF77 or GPS is built in, otherwise =0.
Digit 5: with digit 6 =0 this field is blank.
with digit 6 =1: marks the transfer protocol of the DCF77/GPS receiver
(e.g. = 0 Meinberg, =1 Hopf).
Digit 4: not used.
Digit 3: not used.
Digit 2: = 1 if the option VITC is built in, otherwise = 0.
Digit 1: hexadecimal number (0..F) indicating the built-in modules:
bit 0:
bit 1: =1 if a RS485 is built in, otherwise =0.
bit 2: =1 if colour framing is built in, otherwise =0.
bit 3: =1 if an LTC reader (hardware) is built in, otherwise =0.

Operating Manual AV-MTD G 30 TTT
Page 12
Receiving “Real-Time“ via DCF77 or GPS
There are two standard configurations:
•G 30 TTT with built-in DCF77 receiver. The antenna has to be connected at the insulated
BNC socket at the rear panel. Three LED’s at the front of G 30 TTT indicate the status of
the built-in receiver:
LED free (red) = free-run mode. The receiver outputs the time in free-run mode as long
as this LED lights up.
LED mod. (green) = modulation. Flashes every second to indicate the decoding of the
time telegram.
LED field (green) = field strength of the antenna signal.
•Connection of an external DCF77 or GPS receiver. Using a serial (RS232) interface
(connected at a 9-pin D-Sub) G30TTT receives every second time, date and status data.
Two LED’s at the front of G 30 TTT indicate the status of the serial data:
LED free (red) = free-run mode, the receiver has not been synchronised until
this LED is extinguished.
LED mod. (green) = modulation, flashes every second to indicate reception of
serial data.
Positioning the DCF77 antenna:
The status LED’s mod. and field serve to find out the optimum antenna position. With the
DCF77 receiver built-in in G 30 TTT, these LED’s are located at the front panel of G 30 TTT;
with an external DCF77 receiver, these LED’s are located at the housing of this receiver. In the
latter case the mod. LED at G 30 TTT indicates the reception only of serial data, not of the
radio telegram.
Put the antenna upright and turn slowly until a minimum luminosity of the field LED
appears. Then turn the antenna for 90°in order to achieve the best position. If now the field
LED fully lights up and the mod. LED blinks regularly - without any flickering! - the free LED
should go out after a few minutes. Otherwise the antenna should be installed at another
position.
Please note: the 60th second in the radio telegram is characterised by omitting the seconds
pulse, i.e. in this case the mod. LED of the receiver does not flash.
The DCF77 receiver has an independent clock which runs freely without receiving any signals.
In case of a power failure an accumulator will keep the clock running with a precision of 10-5.
If a synchronisation has once been achieved, the clock is adjusted and a new synchronisation
once or twice a day will be sufficient.
The LTC time information as “real-time“:
Pressing the real-time button selects this generator operating mode. Every time the real-time
button is pressed the actual time of the receiver will be transferred to the generator; otherwise
the generator continues to count on the time locked to the video or free running thus avoiding
the generation of frame jumps. At a pre-selected hour another transfer of the receiver time is
made automatically (i.e. in this case a frame jump of the generator can be expected, for
example at 3:00 at night). This hour can be set using the menu (see chapter “Description of
the menu lines”). G 30 TTT looks for a match of this selected hour with the reference time
input from the GPS or DCF77 receiver.
If this operating mode is used without having a receiver built-in or connected, any MTD user
console may be used to set “real-time“ and date. Please notice REAL on/off at chapter
“Description of the menu lines”.

Operating Manual AV-MTD G 30 TTT
Page 13
“Real-time“ in the MTD timer system:
The “real-time“ is encoded in the user data of the LTC(MTD) and may be displayed on the
displays of the MTD system. This time is synchronised every second to the receiver clock. If
there is no receiver built-in or connected to the G 30 TTT, “real-time“ and date have to be set
using a MTD user console. Please notice REAL on/off at chapter “Description of the menu
lines”.
Option: VITC Generator
The status display shows, whether the VITC generator is built-in or not (see chapter “After
power-on”).
The VITC data are identical to the LTC data.
The VITC lines of the vertical blanking interval are 17 and 19.

Operating Manual AV-MTD G 30 TTT
Page 14
Option: Receiving “Real-Time“ via LTC Input
With this special feature G30TTT receives “real-time” (time and date) via a separate LTC input:
off
1
4
1
23
12
3
2 1
3
1
off
DSUB9F
XLR4M
XLR3M XLR3F
DSUB9F
BNC
In
Loop
LTC In (optional)
LTC Out
DC In
on/off
Data Out:
1: RS485 TRA
2: RS485 TRB
3: LTC_1
4: LTC_2
5: GND
BNC
75Ohm
on
BNC
Option
Power In:
1: GND
4: DC In
12-18V DC
max. 500mA
LTC Out:
1: GND
2: LTC_1
3: LTC_2
balanced, 1Vpp
LTC In:
1: GND
2: LTC_1
3: LTC_2
balanced
50mV - 5V
20-30 frames/sec
GPI
(Option):
1: NC1
2: NO1
3: COM1
Option VITC:
Video+VITC Out
Video In
Loop Out
2 1
3
XLR3F
Real Time LTC In
LTC In:
1: GND
2: LTC_1
3: LTC_2
balanced
50mV - 5V
The LTC at connector XLR3F “Real-Time LTC In” has to conform to the following specifications:
1. LTC of “forward” direction.
2. LTC at normal speed (e.g. 25 frames/sec).
3. Time must be continuous without breaks.
4. The user bits must carry a valid date.
The hardware of this special feature consists of a LTC converter board, which is built-in the
G30TTT housing. The converter reads LTC and outputs a serial protocol - identical to the
DCF77/GPS data protocol. G30TTT receives time, date and status information via an internal
serial interface. The LED mod. at the front of G30TTT flashes every second, if the data meet
all of the specifications. In order to pass condition no. 4 (valid date), the format of the date
can be selected by the switch SW1 at the converter board (switch 1 of the 8-pole switch):
SW1=OFF Date of format day/month/year, + status information:
Day = user digits 5+6 (“minutes“)
Month = user digits 3+4 (“seconds“)
Year = user digits 1+2 (“frames“)
Status = user digits 7 (“units of hours“) and 8 (“tens of hours“):
Digit Bit Status
7 0 =0: time of the LTC is not synchronised to a DCF77/GPS
receiver or the receiver currently works in a free running mode.
=1: time of the LTC is synchronised.
7 1/2 time zone, bits = 1/0: CET, = 0/1: CEST, = 0/0 or 1/1: UTC.
7 3 announcement of start/end of Daylight Saving Times.
8 0 announcement of leap second.
LTC of this kind will be generated e.g. of the unit G30TM, if the operating mode USER MOD.
= 3 STATUS (menu SET) is selected. The LED free at the front of G30TTT goes out, if bit 0 of
digit 7 of the user is set.