HP 58516A GPS L1 User manual

HP 58516A
GPS L1 DISTRIBUTION AMPLIFIER
1. INTRODUCTION
1.1. The HP 58516A GPS L1 Distribution
Amplifier is one component of a complete line of
GPS accessories for your GPS antenna system
available from Hewlett-Packard. These
accessories are designed to deliver precise
GPS signals over a wide temperature range and
in harsh environmental conditions.
1.2. The distribution amplifier is required if you
wish to distribute the signal from a single
antenna to as many as four GPS receivers.
2. DESCRIPTION
2.1. The HP 58516A consists of a broadband,
unity gain amplifier and a 1:4 signal splitter.
Designed for use with GPS antennas, the unit
features a high degree of isolation to eliminate
feedback and interaction between any GPS
systems connected to it.
2.2. Power to the splitter is supplied by the
GPS timing receiver connected to Port 1.
3. USE WITH HP AND NON-HP SYSTEMS
3.1. Although designed for use with HP GPS
frequency and time receivers, the HP 58516A
can be used with other GPS receiver and
antenna systems.
3.2. The HP 58516A operates over a voltage
range of +4.5 Vdc to +30 Vdc. Voltage is
supplied via the connecting cable (the center
conductor is positive with respect to the shield)
to Port 1 of a standard unit, or through an
external dc power input on a unit with Option
05Q.
Caution: Power to the HP 58516A will be
passed to the rest of the antenna system. For
example, if a +30 Vdc supply is used to
power the HP 58516A, the +30 Vdc will be
passed through to the antenna. When using
the HP 58516A with an HP 58504A GPS
antenna, the maximum voltage should be no
greater than +5.5 Vdc.
4. INSIDE THIS INFORMATION NOTE
4.1. This note provides information on the
following topics:
• Distribution amplifier description.
• Installation, including mounting
distribution amplifiers.
• Recommended maintenance.
• Warranty.
• List of specifications.
HP 58516A Data Sheet.pdf 1

5. CONSIDERATIONS FOR LONG CABLE
RUNS
5.1. Due to process variations in the
fabrication of the HP 58516A, the gain through
the device can vary from +3 dB to -3 dB.
Assume the worst case loss of the HP 58516A
when determining if line amplifiers are
necessary in your GPS antenna system.
5.2. The assumed worst case loss through the
HP 58516A is equal to:
• 18 meters (60 ft) of cable length when
using LMR 400 cable
• 8 meters (25 ft) of cable length when
using RG-213 cable.
5.3. Use this procedure to determine if line
amplifiers are required:
1. First, calculate the distance from the
antenna to the most distant receiver.
2. Add the assumed worst case loss
through the HP 58516A in terms of
cable length.
3. Compare the result to the requirements
for line amplifiers below. If line amplifiers
are required, they should be added as
close to the GPS antenna as possible
(within 10 meters/33 feet).
6. REQUIREMENTS FOR LINE AMPLIFIERS
6.1. This section provides information that will
help you determine if line amplifiers are required
for your GPS antenna system installation.
For LMR 400 cable:
6.2. If the estimated cable length between the
antenna and the most distant GPS receiver is
(include the assumed worst case loss through
the HP 58516A):
• Less than 115 meters (377 feet), no line
amplifier is necessary.
• More than 115 meters (377 feet) and
less than 240 meters (787 feet), you
need 1 line amplifier.
• More than 240 meters (787 feet) and
less than 360 meters (1181 feet), you
need 2 line amplifiers.
• More than 360 meters (1181 feet),
contact HP for assistance.
For RG-213 cable:
6.3. If the estimated cable length between the
antenna and the most distant GPS receiver is
(include the assumed worst case loss through
the HP 58516A):
• Less than 53 meters (174 feet), no line
amplifier is necessary.
• More than 53 meters (174 feet) and less
than 105 meters (345 feet), you need 1
line amplifier.
• More than 105 meters (345 feet) and
less than 158 meters (518 feet), you
need 2 line amplifiers.
• More than 158 meters (518 feet),
contact HP for assistance.
7. INSTALLATION
7.1. This section provides information on
installing the distribution amplifier.
1. Connect the cable from the GPS antenna to
the antenna input connector.
2. Connect the initial GPS receiver to the "Port
1" connector. The receiver at this port
provides dc power to the distribution
amplifier and the GPS antenna. Additional
receivers can be connected to any of the
other port connectors.
8. MAINTENANCE
8.1. There is no periodic maintenance
required for the distribution amplifier. However, it
is recommended that all components of the
antenna system be checked periodically and
replaced, if necessary, as specified in company
procedures.
HP 58516A Data Sheet.pdf 2

9. WARRANTY
9.1. This Hewlett-Packard product is
warranted against defects in material and
workmanship for a period of eighteen months
from date of shipment. During the warranty
period, Hewlett-Packard Company will, at its
option, either repair or replace products which
prove to be defective.
NOTICE
Lightning strikes are a natural occurrence. Any
antenna system is susceptible to damage from a
direct lightning strike or the radiated energy from
a lightning strike in the near vicinity. DAMAGE
OF THIS NATURE IS NOT COVERED BY
HEWLETT-PACKARD'S WARRANTY.
HP 58516A Specifications/Characteristics
Frequency Bandwidth (3 dB) 1575.42 MHz +/- 20 MHz
Gain (antenna to output) 0 dB +/- 3 dB @ 1575.42 MHz
Noise Figure <7.0 dB (5.0 dB typical) @ 1575.42 MHz
VSWR <2.5:1 (1.5:1 typical) @ 1575.42 MHz
Isolation > 40 dB @ 1574.42 MHz (L1)
> 40 dB @ f≤L1 - 40 MHz
> 40 dB @ f≥L1 + 40 MHz
DC Power (Port 1)
Operating Voltage
Damage level
Operating current
Maximum input current
Note: Ports 2 through 4 are terminated with a 200Ω
resistor to simulate the load of a GPS antenna
+4.5 Vdc to +30 Vdc
>30 Vdc, either polarity
10 mA
450 mA
AC Input Level (antenna signal)
Impedance
Maximum operating
Damage level
50Ωnominal
-25 dBm
+13 dBm
AC (output ports)
Impedance
50Ωnominal
Operating Environment 0°C to +55°C
Operating Humidity 40% to 85%, non-condensing
Dimensions (including connectors) 88.4 mm (3.5 in) W x 121 mm (4.76 in) L
x 30.7 mm (1.2 in) H
Connectors Female N-type connectors
Weight 0.5 kg
HP 58516A Data Sheet.pdf 3