General Dynamics Mission Systems AD510 Iridium Satellite Transceiver Active Antenna User Manual Active Antenna

Download:
Mirror Download [FCC.gov]
Document ID	326430
Application ID	wqaeH0WUKABUXkn+0eTakg==
Document Description	Users Manual
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	126.2kB (1577550 bits)
Date Submitted	2003-05-19 00:00:00
Date Available	2003-05-19 00:00:00
Creation Date	2002-10-17 09:42:51
Producing Software	Acrobat PDFWriter 4.05 for Windows NT
Document Lastmod	0000-00-00 00:00:00
Document Title	Active Antenna.PDF
Document Creator	Active Antenna - Microsoft Word
Document Author:	Zena_o

AD510-10 Active Transmitter/Receiver Antenna with a 30m or
40m RG213U down-lead and DC regulator for Iridium
Telephone Systems
Introduction
Iridium telephones were originally designed to operate with passive antennae, either an
element attached directly to the handset, or a remote aerial connected with a short length
of coaxial cable. Unfortunately, a signal loss of more than 3dB in a remote antenna’s
connecting cable degrades performance due to attenuation of both the received and
transmitted signals. A 3dB loss corresponds to approximately 10m of RG213U or 3m of
RG58U coaxial cable, lengths that clearly restrict the mounting options for the antenna
using standard down-leads.
The AD510-10 active Iridium antenna (figures 1&2) is designed for use with 30m (98
feet) or 40m (131 feet) of RG213U coaxial cable terminated with type ‘N’ connectors.
Designed for harsh environments, the AD510-10 consists of two RHCP dipole antennae
housed within 4mm thick GRP radomes mounted on a common base. One antenna is for
signal transmission and one for reception. A linear power amplifier within the base and
connected to the transmitting antenna compensates for signal loss incurred mainly by the
connecting cable. Similarly, a low noise amplifier is attached to the receiving antenna via
a low loss interdigital filter to boost the signal sent to the telephone. The interdigital filter
has a bandwidth of 12 MHz centred on the Iridium band designed to attenuate any out of
band interference that may arise, for example from nearby Inmarsat uplinks.
Using manufacturing techniques proven for a range of extremely rugged GPS/DGP active
antennae, the antenna base is milled from aluminium and hard anodised, giving an
attractive green finish, which is mechanically resilient and resistant to corrosion. The
antenna’s mass is 2.6kg.
Mounting and Operation
(1) The AD510-10 should be mounted with an unobstructed view of the sky. An
aluminium bracket with V-bolts is provided to attach the antenna to horizontal or
vertical spars up to 60mm in diameter, figure 2. The bracket is shipped inverted on
the end of the AD510-10 antenna and should be detached, turned over, then
repositioned either to the centre or end of the antenna case as required using the
mounting holes in the base.
(2) The RG213U coaxial down-lead is attached to the N-type connector on the underside
of the antenna, figure 2. Wrapping the connectors with self-amalgamating tape is
recommended for permanent installations and the cable should be taped or strapped
to the spar as appropriate.
(3) AD510-10 antennae supplied with 40m RG213U down-leads must be used with
the accompanying AD510-40 DC supply voltage regulators (figure 3), which
accept +9V to +36V dc at 500mA. The down-lead must not be shortened by the
user. Similarly, antennae supplied with 30m RG213U down-leads are only to be
used with the AD510-30 DC supply voltage regulators provided. Again, the
down-lead must not be shortened. In all other respects, however, the assembly
and operation of the 30m cable systems are identical to those with 40m cables.
(4) The AD510-40 (or AD510-30) supply voltage regulator should be positioned close to
the telephone base-station or handset. The RG213U down-lead is then attached to
the N type connector on the AD510-40 (figures 3 and 4).
(5) Connection between the telephone and the AD510-40 is made with a coaxial cable
terminated with TNCs. An adapter is provided with the Iridium handset, which
enables a TNC terminated cable to be attached to the telephone. The AD510-40 case
has drilled flanges to enable permanent fixing.
(6) A 3m flying lead for the AD510-40 (or AD510-30) supply regulator is provided for
connection to the DC supply (+9 to 36Vdc at 500mA), which can be trimmed (or
extended) if necessary. The red wire is connected to supply positive, whilst the blue
wire is for either an isolated or grounded negative supply. The AD510-40 (or
AD510-30) is protected against output short-circuiting by a fuse, which is resettable
by disconnecting the unit from the +9 to +36Vdc supply.
(7) With all connections made, the telephone can then be turned on and used as normalit is transmitting into a load impedance equivalent to a matched passive antenna. The
gains of the antenna transmitter and receiver are factory set to compensate for the
total attenuation between the telephone and the antenna, mainly determined by the
RG213U down-lead. Consequently, the signal output level and frequency from the
antenna is equivalent to that radiating from a passive antenna mounted directly on the
handset, subject to the antenna transmitter being a linear device. Transmitter linearity
is verified with test protocols using an HP 8591 EMC analyser that also ensure there
are no spurious out of band emissions.
Figure 1. AD510-10 Active Iridium antenna
Figure 2. AD510-10 active Iridium antenna with mounting bracket and RG213U coaxial
down-lead
Figure 3. AD510-40 voltage regulator and break-in for use with +9 to 36Vdc supply. The
case is hard anodised aluminium and has fixing flanges. A 40m coil of RG213U cable is
shown connected to an AD510-10 active antenna (top). The handset interconnect is
shown trailing from the TNC to the bottom left, whilst the flying lead for connection to 9
to 36V dc supply is shown cutting the frame to the right.
Figure 4. Schematic diagram for system connections
(1) Mount AD510-10 active antenna with clear view of sky using bracket supplied.
(2) Attach top end of 40m (or 30m) down-lead to N type connector on underside of
antenna.
(3) Attach bottom end of down-lead to N type connector on voltage supply regulator
AD510-40 (or AD510-30). The down-lead must not be shortened by the user.
(4) Attach interconnect between TNC on AD510-40 (or AD510-30) and telephone (or
base station) using the antenna adapter provided with the phone.
(5) Attach DC supply lead to +9 to +36V DC supply (500mA max). Red lead to +supply,
Blue to –supply.
(6) Turn on Iridium telephone and log-in.
END OF INSTRUCTIONS

---

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.2
Linearized                      : No
Page Count                      : 5
Creator                         : Active Antenna - Microsoft Word
Create Date                     : 2002:10:17 09:42:51
Title                           : Active Antenna.PDF
Author                          : Zena_o
Producer                        : Acrobat PDFWriter 4.05 for Windows NT

EXIF Metadata provided by EXIF.tools