Symmetricom Time Server User Manual Page 27
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6000-100Ch2.fm Rev. D TimeVault™ User’s Manual 2-13
Site Preparation Chapter 2: Installation and Start-Up
2.1.3 Antenna Information
Voltage Requirement and Signal Levels
TimeVault requires a 12 V antenna. Any antenna that
does not support 12 V may be severely damaged if
plugged into TimeVault.
The GPS Synchronized Receiver, integral to TimeVault,
operates on the L1 (1575.42 MHz) signal and the C/A
code (1.023 MHz bit rate) with a minimum signal level
of –162.0 dBW and a maximum signal level of
–137.0 dBW. The antenna system supplied is designed to
provide the proper signal levels to the receiver with the
cable length supplied.
Use of a Splitter
To run multiple units with a single 12 V antenna, use a splitter. Do not use a BNC “T”
connector, which doesn’t provide the proper voltage the unit needs to operate.
Lead-In Cable
The L1 GPS antenna is designed to operate with up to 200 ft (60.96 m) of RG-59 coax
cable. The optional Down/Up Converter is designed to operate with up to 1,500 ft
(457.2 m) of RG-58 coaxial cable. For details and illustrations on cabling, see page 2-15.
2.1.4 GPS Roof-Mounted Antenna Installation
When selecting a site for the standard outdoor antenna, find an outdoor location that
provides full 360-degree visibility of the horizon. In most cases, this means locating the
antenna as high as possible. Any obstruction will degrade unit performance by blocking
the satellite signal or causing a reflection that cancels some of the signal. Blocked signals
can significantly increase the time for satellite acquisition, or prevent acquisition all
together.
Mast Mounting
Mast top mounting is the preferred mounting method and
special brackets are provided to mount the antenna to a pipe or
the peak of a building. The antenna mounting mast should be
2-inch (5.08-cm) water pipe or conduit. The mast must be rigid
and able to withstand high winds without flexing. Guy wires
may be used to stabilize a mast longer than 10 ft (3.048 m)
Multipath cancellation is caused by reflected signals that
arrive at the antenna out of phase with the direct signal.
Reflective interference is most pronounced at
low elevation
angles from 10 to 20 degrees above the horizon. You may
12 V GPS Antenna
Coaxial Cable
Threaded Cable
Housing
Figure 2-1 Basic Antenna
Components
12 V GPS
Mast
Figure 2-2: Mast Mountin
g
Illustration
Antenna
- TimeVault 1
- Class A 3
- DECLARATION OF CONFORMITY 4
- User’s Manual 8
- 1 Table of Contents i 11
- 2 General Information 1 11
- 4 Remote Operation 31 12
- Table of Contents 13
- F Non-Standard Features 127 14
- General Information 15
- G for GPS, A for ACTS and N 21
- 1.13.3 ACTS Port 23
- 2.1.1 Mounting Instructions 25
- 2.1.2 Necessary Equipment 26
- Placing the Window Antenna 28
- 12:00 NOON 28
- Best W indow 28
- (Be sure your 30
- 2.3.1 GPS Mode 31
- Satellite Acquisition 32
- 2.3.2 ACTS Mode 33
- 2.3.3 NTP Mode 33
- UTC: DDD;HH:MM:SS 35
- 2.3.5 Rolling Redundancy 36
- 2.4.1 Alphanumeric Display 37
- 2.4.2 Keypad Operation 38
- Keypad Entry Guidelines 38
- Display Security 40
- Further Precautions 41
- Disabling Security 41
- DHCP status OFF is displayed 43
- Remote Operation 45
- Status Message Window 47
- Remote NTP Configuration 50
- Remote SNMP Configuration 52
- Telnet in the Open field 54
- 3.2.2 Ending Telnet 55
- 3.3.1 Serial Line Settings 56
- 3.3.2 HyperTerminal 57
- Starting HyperTerminal 57
- The name of your last session 61
- 3.4.2 Telnet Session Timer 62
- F<FUNC#><Enter> 63
- F03<Enter> 64
- OK<CR><LF> 64
- Command Function Parameters 65
- F60<Enter> 70
- Are you sure? (y/N) 87
- <CR><LF> 88
- TimeVault-Generated Messages 101
- A.1.1 NTP Data Packet 105
- Leap Indicator 106
- Version Number 106
- Authenticator 108
- Reference Timestamp 108
- Originate Timestamp 108
- Receive Timestamp 108
- Transmit Timestamp 108
- A.3.1 NTPQ 110
- A.3.2 NTPDC 110
- A.3.3 For more information 110
- TIME and DAYTIME Protocols 119
- C 2.3 DAYTIME String Format 120
- Introduction 124
- Variable Definitions 125
- Non-Standard Features 141
- Numerics 143
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