Meinberg PZF180 User manual

MANUAL
PZF180
DCF77 Correlation Receiver
December 8, 2021
Meinberg Funkuhren GmbH & Co. KG

Table of Contents
1 Imprint 1
2 Safety instructions for building-in equipment 2
2.1 Important Safety Instructions and Protective Measures ......................... 2
2.2 Used Symbols ................................................. 3
2.3 Safety Hints PZF180 ............................................ 4
2.4 Prevention of ESD Damage ......................................... 5
2.5 Cabling ..................................................... 6
2.6 Replacing the Lithium Battery ....................................... 6
3 General information PZF 7
3.1 Features of PZF ............................................... 8
4 PZF180 Features 9
4.1 Pulse and Frequency Outputs ....................................... 9
4.2 Time Capture Inputs ............................................. 9
4.3 Asynchronous Serial Ports ......................................... 9
4.4 DCF77 Emulation .............................................. 10
4.5 Programmable pulse ............................................. 10
4.6 Time Code (Option) ............................................. 11
4.6.1 Abstract of Time Code ....................................... 11
4.6.2 Block Diagram Time Code ..................................... 11
4.6.3 IRIG Standard Format ....................................... 12
4.6.4 AFNOR Standard Format ..................................... 13
4.6.5 Assignment of CF Segment in IEEE1344 Code ......................... 14
4.6.6 Generated Time Codes ....................................... 15
4.6.7 Selection of Generated Time Code ................................ 16
4.6.8 Outputs ................................................ 16
4.6.9 Technical Data ............................................ 16
5 Installation 17
5.1 The Front Panel Layout ........................................... 17
5.2 DCF77 Antenna ................................................ 18
5.2.1 Mounting and Installation of a Longwave Antenna ....................... 18
5.3 Power Supply ................................................. 20
5.4 Powering Up the System .......................................... 20
5.5 Meinberg Device Manager ......................................... 21
5.6 The program GPSMON32 .......................................... 23
5.6.1 Serial Connection .......................................... 23
5.6.2 Network Connection ......................................... 23
5.6.3 Online Help ............................................. 24
6 Update of the System Software 25
7 Technical specifications PZF180 26
7.1 Technical Specifications AW02 Antenna .................................. 29
7.1.1 Antenna Cable ............................................ 31
7.1.2 Antenna Short Circuit ........................................ 31
7.1.3 Technical Specifications: MBG S-PRO Surge Protection ................... 32
7.2 Oscillator specifications ........................................... 35
7.3 Time Strings .................................................. 36
7.3.1 Format of the Interflex Time String ................................ 36
7.3.2 Format of the Meinberg Standard Time String ......................... 37
7.3.3 Format of the Uni Erlangen String (NTP) ............................ 38
3

7.3.4 Format of the ATIS standard Time String ............................ 40
7.3.5 Format of the SYSPLEX-1 Time String ............................. 41
7.3.6 Format of the SAT Time String .................................. 42
7.3.7 Format of the SPA Time String .................................. 43
7.3.8 Format of the Computime Time String .............................. 44
7.3.9 Format of the NMEA 0183 String (RMC) ............................ 45
8 RoHS and WEEE 46
Date: December 8, 2021 PZF180

1 Imprint
1 Imprint
Meinberg Funkuhren GmbH & Co. KG
Lange Wand 9, 31812 Bad Pyrmont, Germany
Phone: + 49 (0) 52 81 / 93 09 - 0
Fax: + 49 (0) 52 81 / 93 09 - 230
Website: https://www.meinbergglobal.com
Email: [email protected]
Date: December 9, 2021
PZF180 Date: December 8, 2021 1

2 Safety instructions for building-in equipment
2.1 Important Safety Instructions and Protective Measures
The following safety instructions must be observed whenever the device is being installed or operated. Failure
to observe safety instructions and other special warnings and operating instructions in the product manuals
constitutes improper usage and may violate safety standards and the manufacturer’s requirements.
Depending on the configuration of your device or installed options, some information may
not specifically apply to your device.
The device satisfies the requirements of the following EU regulations: EMC Directive,
Low Voltage Directive, RoHS Directive and—where applicable—the Radio Equipment Directive.
If a procedure is marked with the following signal words, you may only proceed with it if you have understood
and fulfilled all requirements. Hazard notices and other relevant information are classified and indicated as
such in this manual according to the following system:
DANGER!
This signal word indicates a hazard with a high risk level . Such a notice refers to a procedure
or other action that will very likely result in serious injury or even death if not observed or
if improperly performed.
WARNING!
This signal indicates a hazard with a medium risk level . Such a notice refers to a procedure or
other action that may result in serious injury or even death if not observed or if improperly
performed.
CAUTION!
This signal word indicates a hazard with a low risk level . Such a notice refers to a procedure or
other action that may result in minor injury if not observed or if improperly performed.
ATTENTION!
This signal word refers to a procedure or other action that may result in product damage or the
loss of important data if not observed or if improperly performed.
2 Date: December 8, 2021 PZF180

2 Safety instructions for building-in equipment
2.2 Used Symbols
The following symbols and pictograms are used in this manual. Pictograms are used in particular to indicate
potential hazards in all hazard categories.
Symbol
Beschreibung / Description
IEC 60417-5031
Gleichstrom / Direct current
IEC 60417-5032
Wechselstrom / Alternating current
IEC 60417-5017
Erdungsanschluss / Earth (ground) terminal
IEC 60417-5019
Schutzleiteranschluss / Protective earth (ground) terminal
ISO 7000-0434A
Vorsicht / Caution
IEC 60417-6042
Vorsicht, Risiko eines elektrischen Schlages / Caution, risk of electric shock
IEC 60417-5041
Vorsicht, heiße Oberfläche / Caution, hot surface
IEC 60417-6056
Vorsicht, Gefährlich sich bewegende Teile / Caution, moving parts
IEC 60417-6172
Trennen Sie alle Netzstecker / Disconnect all power connectors
IEC 60417-5134
Elektrostatisch gefährdete Bauteile / Electrostatic Discharge Sensitive Devices
IEC 60417-6222
Information generell / General information
2012/19/EU
Dieses Produkt fällt unter die B2B Kategorie. Zur Entsorgung muss es an den
Hersteller übergeben werden.
This product is handled as a B2B-category product. To ensure that the product is
disposed of in a WEEE-compliant fashion, it must be returned to the manufacturer.
PZF180 Date: December 8, 2021 3

The product manuals are provided on a USB flash drive delivered with the system. The manuals can also be
downloaded from the Meinberg website at https://www.meinbergglobal.com, where you can enter your system
name into the search box at the top of the page to find the relevant manual. Alternatively, contact Meinberg
Support for further assistance.
This manual contains important safety instructions for the installation and operation of the
device. Please read this manual thoroughly before using the device.
This device may only be used for the purpose described in this manual. In particular, the
specified operating limits of the device must be heeded. The person setting up the device is
responsible for safety matters in relation to any larger system in which the device is
installed!
Failure to observe these instructions may have an adverse impact on device safety!
Please keep this manual in a safe place.
This manual is only intended to be used by qualified electricians, or by persons who have been appropriately
instructed by a qualified electrician and who are familiar with applicable national standards and with safety
rules & regulations. This device may only be installed, set up, and operated by qualified personnel.
2.3 Safety Hints PZF180
This building-in equipment has been designed and tested in accordance with the requirements of Standard DIN
EN 62368-1 "Audio/video, information and communication technology equipment - Part 1: Safety requirements).
During installation of the building-in equipment in an end application (i.e. PC) additional requirements in
accordance with Standard DIN EN 62368-1 have to be taken into account.
General Safety instructions
•The building-in equipment has been evaluated for use in office environment (pollution degree 2) and
may be only used in this environment. For use in rooms with a higher pollution degree more stringent
requirements are applicable.
•The equipment/building-in equipment was evaluated for use in a maximum ambient temperature of 50◦C.
•Protection against fire must be assured in the end application.
4 Date: December 8, 2021 PZF180

2 Safety instructions for building-in equipment
2.4 Prevention of ESD Damage
ATTENTION!
An ESDS device (electrostatic discharge-sensitive device) is any device at risk of damage or
malfunction due to electrostatic discharges (ESD) and thus requires special measures to prevent
such damage or malfunction. Systems and modules with ESDS devices usually bear the following
symbol:
Symbol Indicating Devices with ESDS Components
The following measures will help to protect ESDS components from damage and malfunction.
When preparing to dismantle or install devices:
Ground your body (for example, by touching a grounded object) before touching sensitive devices.
Ensure that you wear a grounding strap on your wrist when handling such devices. These straps must
in turn be attached to an uncoated, non-conductive metal part of the system.
Use only tools and devices that are free of static electricity.
When transporting devices:
Devices must only be touched or held by the edges. Never touch any pins or conductors on the device.
When dismantling or installing devices:
Avoid coming into contact with persons who are not grounded. Such contact may compromise your
connection with the earth conductor and thus also compromise the device’s protection from any
static charges you may be carrying.
When storing devices:
Always store devices in ESD-proof ("antistatic") bags. These bags must not be damaged in any way.
ESD-proof bags that are crumpled or have holes cannot provide effective protection against
electrostatic discharges.
ESD-proof bags must have a sufficient electrical resistance and must not be made of conductive
metals if the device has a lithium battery fitted on it.
PZF180 Date: December 8, 2021 5

2.5 Cabling
WARNING!
Danger of death from electric shock! Never work on the system while the power is live! Always disconnect the
cables from the devices at both ends before working on the plugs and terminals of connected cables!
2.6 Replacing the Lithium Battery
Skilled/Service-Personnel only: Replacing the Lithium Battery
The life time of the lithium battery on the receiver boards is at least 10 years. If the need arises to replace the
battery, the following should be noted:
There is a Danger of explosion if the lithium battery is replaced incorrectly. Only identical batteries or
batteries recommended by the manufacturer must be used for replacement.
The waste battery has to be disposed as proposed by the manufacturer of the battery.
6 Date: December 8, 2021 PZF180

3 General information PZF
3 General information PZF
The German long wave transmitter DCF77 started continuous operation in 1970. The introduction of time codes
in 1973 build the basic for developing modern radio remote clocks.
The carrier frequency of 77.5 kHz is amplitude modulated with time marks each second. The BCD-coding
of the time telegram is done by shifting the amplitude to 25% for a period of 0.1s for a logical ’0’ and for 0.2s
for a logical ’1’. The receiver reconstructs the time frame by demodulating this DCF-signal. Because the AM-
signal is normally superimposed by interfering signals, filtering of the received signal is required. The resulting
bandwidth-limiting causes a skew of the demodulated time marks which is in the range of 10 ms. Variations of
the trigger level of the demodulator make the accuracy of the time marks worse by additional +/-3 ms. Because
this precision is not sufficient for lots of applications, the PTB (Physical and Technical Institute of Germany)
began to spread time information by using the correlation technique.
The DCF-transmitter is modulated with a pseudo-random phase noise in addition to the AM. The pseudo-
random sequence (PZF) contains 512 bits which are transmitted by phase modulation between the AM-time
marks. The bit sequence is build of the same number of logical ’0’ and logical ’1’ to get a symmetrical PZF to
keep the average phase of the carrier constant. The length of one bit is 120 DCF-clocks, corresponding to 1,55
ms. The carrier of 77.5 kHz is modulated with a phase deviation of +/-10◦per bit. The bit sequence is transmit-
ted each second, it starts 200ms after the beginning of an AM second mark and ends shortly before the next one.
Compared to an AM DCF77-receiver, the input filter of a correlation receiver can be dimensioned wide-
bandwidth. The incoming signal is correlated with a reconstructed receiver-PZF. This correlation analysis
allows the generation of time marks which have a skew of only some microseconds. In addition, the interference
immunity is increased by this method because interference signals are suppressed by averaging the incoming
signal. By sending the original or the complemented bit sequence, the BCD-coded time information is trans-
mitted.
The absolute accuracy of the generated time frame depends on the quality of the receiver and the distance
to the transmitter, but also on the conditions of transmission. Therefore the absolute precision of the time frame
is better in summer and at day than in winter and at night. The reason for this phenomenon is a difference in
the portion of the sky wave which superimposes the ground wave. To check the accuracy of the time frame, the
comparison of two systems with compensated propagation delay is meaningful.
PZF180 Date: December 8, 2021 7

3.1 Features of PZF
The PZF is a high precision receiveer module for the DCF77-signal build in euro card size (100 mm x 160 mm).
The micro controller of the system correlates its receiver-PZF with the incoming pseudorandom sequence and
decodes the time information of the DCF-telegram simultaneously. The controller handles input and output
functions of the PZF180 and synchronizes the internal real-time clock.
By evaluating the pseudorandom phase noise, the PZF is able to generate time frames with thousand times
the accuracy of standard AM-time code receivers. The precise regulation of the main oscillator (TCXO, OCXO
optional for higher accuracy) of the radio clock is possible therefore. So, the PZF can be used as a standard
frequency generator besides the application as a time code receiver. Three fixed and one settable TTL-level
standard frequencies are available at the rear VG-connector. The synthesizer frequency exists as an open drain
output and a sine wave signal also.
The PZF delivers TTL-low and TTL-high active pulses per minute and per second further. To distribute in-
formation concerning date, time and status, four independent serial interfaces (RS232) are used which are
configurable in a setup menu.
Like mentioned before, the PZF includes a battery-backed real-time clock which runs crystal-precise if the
main power supply fails.
8 Date: December 8, 2021 PZF180

4 PZF180 Features
4 PZF180 Features
The carrier frequency of 77.5kHz is amplitude modulated with time marks each second. The BCD-coding of the
time telegram is done by shifting the amplitude to 25% for a period of 0.1s for a logical ’0’ and for 0.2s for a
logical ’1’. The receiver reconstructs the time frame by demodulating this DCF-signal.
By evaluating the pseudorandom phase noise, the PZF180 is able to generate time frames with thousand
times the accuracy of standard AM-time code receiver. The precise regulation of the main oscillator of the radio
clock is possible therefore. So, the PZF180 can be used as a standard frequency generator besides the appli-
cation as a time code receiver. One fixed 10MHz frequency and one settable TTL-level standard frequencies
are available at the rear VG-connector. These frequencies are provided as sinewave outputs as well.
The PZF180 provides the capability to evaluate the high-precision pseudorandom phase noise as well as
the common amplitude modulated AM signal. If the PZF signal is disturbed an cannot be received, the PZF180
automatically switches over to decode the AM signal, if available, and ensures synchronisation.
4.1 Pulse and Frequency Outputs
The pulse generator of PZF180 generates pulses once per second (P_SEC) and once per minute (P_MIN).
Additionally, master frequencies of 10 MHz, 1 MHz and 100 kHz are derived from the OCXO. All the pulses are
available with TTL level at the rear connector.
Frequency Outputs (optional)
The included synthesizer generates a frequency from 1/8 Hz up to 10 MHz synchronous to the internal timing
frame. The phase of this output can be shifted from -360◦to +360◦for frequencies less than 10 kHz. Both
frequency and phase can be setup by using the serial port COM0. Synthesizer output is available at the
rear connector as sine-wave output (F_SYNTH_SIN), with TTL level (F_SYNTH) and via an open drain output
(F_SYNTH_OD). The open drain output can be used to drive an optocoupler when a low frequency is generated.
In the default mode of operation, pulse outputs and the synthesizer output are disabled until the receiver
has synchronized after power-up. However, the system can be configured to enable those outputs immedi-
ately after power-up. An additional TTL output (TIME_SYN) reflects the state of synchronization. This output
switches to TTL HIGH level when synchronization has been achieved and returns to TTL LOW level if not a
time signal can be received or the receiver is forced to another mode of operation by the user.
4.2 Time Capture Inputs
Two time capture inputs called User Capture 0 and 1 are provided at the rear connector (CAP0 and CAP1) to
measure asynchronous time events. A falling TTL slope at one of these inputs lets the microprocessor save the
current real time in its capture buffer. From the buffer, capture events are transmitted via COM0 or COM1 and
displayed on LCD. The capture buffer can hold more than 500 events, so either a burst of events with intervals
down to less than 1.5 msec can be recorded or a continuous stream of events at a lower rate depending on the
transmission speed of COM0 or COM1 can be measured.
The format of the output string is ASCII, see the technical specifications at the end of this document for
details. If the capture buffer is full a message "** capture buffer full" is transmitted, if the interval between two
captures is too short the warning "** capture overrun" is being sent.
4.3 Asynchronous Serial Ports
Up to four asynchronous serial RS-232 interfaces (COM0 ... COM3) are available to the user. By default,
automatic transmission of a time string via the serial ports is disabled until the receiver has synchronized.
PZF180 Date: December 8, 2021 9

However, it is possible to change the device configuration so that serial time strings are always transmitted
immediately after power-up.
Transmission speeds, framings and mode of operation can be configured separately using the setup menu.
COM0 is compatible with other radio remote clocks made by Meinberg. It sends the time string either once per
second, once per minute or on request with ASCII ´?´ only. Also the interfaces can be configured to transmit
capture data either automatically when available or on request. The format of the output strings is ASCII, see
the technical specifications at the end of this document for details.
4.4 DCF77 Emulation
The clock generates TTL level time marks (active HIGH) which are compatible with the time marks spread by
the German long wave transmitter DCF77. This long wave transmitter installed in Mainflingen near Frank-
furt/Germany transmits the reference time of the Federal Republic of Germany: time of day, date of month and
day of week in BCD coded second pulses. Once every minute the complete time information is transmitted.
However, the generates time marks representing its local time as configured by the user, including announce-
ment of changes in daylight saving and announcement of leap seconds. The coding sheme is given below:
A2 Announcement of a Leap Second
S Start of Time Code Information
P1, P2, P3 Even Parity Bits
Z1, Z2 = 1, 0: Daylight Saving Time Enabled
M Start of Minute (0.1 s)
R RF Transmission via Secondary Antenna
A1 Announcement of a Change in Daylight Saving Time
Z1, Z2 Time Zone Identification
Z1, Z2 = 0, 1: Daylight Saving Time Disabled
0
10
20
30
40
50
R
M
1
4
2
1
20
10
8
4
2
1
P2
20
10
8
4
2
1
2
4
8
10
1
2
4
8
10
20
40
80
P3
A1
Z1
Z2
A2
S
1
2
4
8
10
20
40
P1
Minute
(Reserved)
Hour
Day of Month
Day of Week
Last Two Digits of Year
Month of Year
Time marks start at the beginning of new second. If a binary "0" is to be transmitted, the length of the
corresponding time mark is 100 msec, if a binary "1" is transmitted, the time mark has a length of 200 msec. The
information on the current date and time as well as some parity and status bits can be decoded from the time
marks of the 15th up to the 58th second every minute. The absence of any time mark at the 59th second of a
minute signals that a new minute will begin with the next time mark. The DCF emulation output is enabled
immediately after power-up.
4.5 Programmable pulse
At the male connector Typ VG96 there are four programmable TTL outputs (Prog Pulse 0-3), which are arbitrarily
programmable.
10 Date: December 8, 2021 PZF180

4 PZF180 Features
4.6 Time Code (Option)
4.6.1 Abstract of Time Code
The transmission of coded timing signals began to take on widespread importance in the early 1950´s. Espe-
cially the US missile and space programs were the forces behind the development of these time codes, which
were used for the correlation of data. The definition of time code formats was completely arbitrary and left to
the individual ideas of each design engineer. Hundreds of different time codes were formed, some of which were
standardized by the "Inter Range Instrumentation Group" (IRIG) in the early 60´s.
Except these "IRIG Time Codes", other formats like NASA36, XR3 or 2137 are still in use. The board PZF180
however generates the IRIG-B, AFNOR NFS 87-500 code as well as IEEE1344 code which is an IRIG-B123
coded extended by information for time zone, leap second and date. Other formats may be available on request.
A modulated IRIG-B (3 Vpp into 50W) and an unmodulated DC level shift IRIG-B (TTL) signal are available at
the VG64 male connector of the module.
4.6.2 Block Diagram Time Code
modulated time code
modulated time code
hgh active and low active
driver
50 Ω unbalanced
driver
TTL
D/A converter
modulator
digital
sinewave
generator
microcontroller
time code
EPLD
10 MHz
PPS
PZF180 Date: December 8, 2021 11

4.6.3 IRIG Standard Format
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4 PZF180 Features
4.6.4 AFNOR Standard Format
PZF180 Date: December 8, 2021 13

4.6.5 Assignment of CF Segment in IEEE1344 Code
Bit No. Designation Description
49 Position Identifier P5
50 Year BCD encoded 1
51 Year BCD encoded 2 low nibble of BCD encoded year
52 Year BCD encoded 4
53 Year BCD encoded 8
54 empty, always zero
55 Year BCD encoded 10
56 Year BCD encoded 20 high nibble of BCD encoded year
57 Year BCD encoded 40
58 Year BCD encoded 80
59 Position Identifier P6
60 LSP - Leap Second Pending set up to 59s before LS insertion
61 LS - Leap Second 0 = add leap second, 1 = delete leap second 1.)
62 DSP - Daylight Saving Pending set up to 59s before daylight saving changeover
63 DST - Daylight Saving Time set during daylight saving time
64 Timezone Offset Sign sign of TZ offset 0 = ’+’, 1 = ’-’
65 TZ Offset binary encoded 1
66 TZ Offset binary encoded 2 Offset from IRIG time to UTC time.
67 TZ Offset binary encoded 4 Encoded IRIG time plus TZ Offset equals UTC at all times!
68 TZ Offset binary encoded 8
69 Position Identifier P7
70 TZ Offset 0.5 hour set if additional half hour offset
71 TFOM Time figure of merit
72 TFOM Time figure of merit time figure of merit represents approximated clock error. 2.)
73 TFOM Time figure of merit 0x00 = clock locked, 0x0F = clock failed
74 TFOM Time figure of merit
75 PARITY parity on all preceding bits incl. IRIG-B time
1.) current firmware does not support leap deletion of leap seconds
2.) TFOM is cleared, when clock is synchronized first after power up. see chapter Selection of generated
timecode
14 Date: December 8, 2021 PZF180

4 PZF180 Features
4.6.6 Generated Time Codes
Besides the amplitude modulated sine wave signal, the board also provides unmodulated
DC-Level Shift TTL output in parallel. Thus six time codes are available.
a) B002: 100 pps, DCLS signal, no carrier
BCD time-of-year
b) B122: 100 pps, AM sine wave signal, 1 kHz carrier frequency
BCD time-of-year
c) B003: 100 pps, DCLS signal, no carrier
BCD time-of-year, SBS time-of-day
d) B123: 100 pps, AM sine wave signal, 1 kHz carrier frequency
BCD time-of-year, SBS time-of-day
e) B006: 100 pps, DCLS Signal, no carrier
BCD time-of-year, Year
f) B126: 100 pps, AM sine wave signal, 1 kHz carrier frequency
BCD time-of-year, Year
g) B007: 100 pps, DCLS Signal, no carrier
BCD time-of-year, Year, SBS time-of-day
h) B127: 100 pps, AM sine wave signal, 1 kHz carrier frequency
BCD time-of-year, Year, SBS time-of-day
i) AFNOR: Code according to NFS-87500, 100 pps, wave signal,
1kHz carrier frequency, BCD time-of-year, complete date,
SBS time-of-day, Signal level according to NFS-87500
j) IEEE1344: Code according to IEEE1344-1995, 100 pps, AM sine wave signal,
1kHz carrier frequency, BCD time-of-year, SBS time-of-day,
IEEE1344 extensions for date, timezone, daylight saving and
leap second in control functions (CF) segment.
(also see table ’Assignment of CF segment in IEEE1344 mode’)
k) C37.118 Like IEEE1344 - with turned sign bit for UTC-Offset
PZF180 Date: December 8, 2021 15

4.6.7 Selection of Generated Time Code
The time code to be generated can be selected by Menu Setup IRIG-settings or by the used Monitorprogram
(except Lantime models). DC-Level Shift Codes (PWM-signal) B00x and modulated sine wave carrier B12x
are always generated simultaneously. Both signals are provided at the VG64-Connector, i.e. if code B132 is
selected also code B002 is available. This applies for the codes AFNOR NFS 87-500 and IEEE1344 as well.
The TFOM field in IEEE1344 code is set dependent on the ’already sync’ed’ character (’#’) which is sent
in the serial time telegram. This character is set, whenever the preconnected clock was not able to synchronize
after power up reset. The ’time figure of merit’ (TFOM) field is set as follows.
Clock synchronized once after power up: TFOM = 0000
Clock not synchronized after power up: TFOM = 1111
For testing purposes the output of TFOM in IEEE1344 mode can be disabled. The segment is set to all zeros
then.
4.6.8 Outputs
The module PZF180 provides modulated (AM) and unmodulated (DCLS) outputs. The format of the timecodes
is illustrated in the diagramms "IRIG-" and "AFNOR standard-format".
4.6.8.1 AM - Sine Wave Output
The carrier frequency depends on the code and has a value of 1 kHz (IRIG-B). The signal amplitude is 3 Vpp
(MARK) and 1 Vpp (SPACE) into 50 Ohm. The encoding is made by the number of MARK-amplitudes during
ten carrier waves. The following agreements are valid:
a) binary "0": 2 MARK-amplitudes, 8 SPACE-amplitudes
b) binary "1": 5 MARK-amplitudes, 5 SPACE-amplitudes
c) position-identifier: 8 MARK-amplitudes, 2 SPACE-amplitudes
4.6.8.2 PWM DC Output
The pulse width DCLS signals shown in the diagramms "IRIG" and "AFNOR standard format" are coexistent to
the modulated output and is available at the VG connector pin 13a with TTL level.
4.6.9 Technical Data
Outputs: Unbalanced AM-sine wave-signal:
3 Vpp (MARK) / 1 Vpp (SPACE) into 50 Ohm
DCLS signal: TTL
16 Date: December 8, 2021 PZF180