405019A Cobham Aviator TT-5019A Iridium Band Reject Filter

You can use the AVIATOR 200/300/350 system on aircrafts with installed IRIDIUM satellite phones.

To have the SwiftBroadband and IRIDIUM service working smoothly next to each other an Iridium Band Reject Filter must be installed between the SBU and the HLD unit.
An INMARSAT Dual RF Filter (Aircell P/N P13167) must also be inserted in the antenna coax cable of the Iridium system

Safe distance to Inmarsat satcoms

• Using Iridium and Inmarsat satcom systems on the same aircraft will normally cause problems, because the two systems use frequency bands next to each other.
• The problem is that the transmit signal from the Inmarsat satcom system will overload the receiver section of the Iridium system.
• This is due to the fact that Iridium systems in general have no filters which could ensure resilience against transmissions in adjacent bands.
• Appropriate filtering, in the Inmarsat and in the Iridium systems allows having both systems.
• The filtering reduces the impact to an acceptable minimum.

To avoid this, two filters are needed:

• An Iridium Band Reject Filter, TT-5019A, must be inserted between the SBU and the HLD.
• An INMARSAT Dual RF Filter, Aircell P/N P13167, must be inserted in the antenna coax of the Iridium system.

Whats in the Box

• Iridium Bandpass Filter Unit
• Individual Analysis/Test Result Certificate
• FAA docs (only if ordered)

Features

• Specifically designed with a narrow bandwidth
• Minimizes interference from other systems in close proximity.
• Improves the overall performance of the Iridium Device.
• High rejection to isolate Iridium frequencies from outside interference such as Inmarsat systems.
• Utilizes a special plating process
• Provide good lightning protection for the Iridium module when the body of the filter is well grounded.
• No additional lightning arrester is required.
• Manufacturers Warranty
• Made in USA

Installation

• Electrical installation and wiring: The filter works in both directions. Connect it to the SBU and HLD to provide the best fit in the current installation.
• Configuration: No configuration is necessary for the TT-5019A Iridium Band Reject Filter.

Mounting considerations
Forced cooling is not required for the Iridium Band Reject Filter.
Mount the TT-5019A Iridium Band Reject Filter on the Tx connection between the SBU and the HLD. The filter works in both directions.
• Install the Iridium Band Reject Filter in non-temperature controlled locations and inside or outside pressurized locations.
• If possible mount the Iridium Band Reject Filter in a temperature controlled location to ensure optimum performance.
• The Iridium Band Reject Filter has an attenuation of 1 dB, consider this during wiring.
• For grounding purposes, you may remove the paint around the mounting holes of the Iridium Band Reject Filter

General Aviator Systems – Compatibility with IRIDIUM satellite phones
You can use the AVIATOR 200/300/350 system on aircraft with IRIDIUM satellite phones.
As Inmarsat satcom systems and Iridium satcom systems are using adjacent frequency bands, there is a potential risk of interference when the Iridium system is used at the same
time as the Inmarsat system.

The following table shows the minimum distances between the two systems for various antenna types and degrees of acceptable impact:

Probability of Interference / Distance to Antennas

Type – Very Low / Low
LGA 1.9m / 1.3m
IGA  3.0m / 2.0m
HGA 7.0m / 4.5m

Specifications

Dimensions (L x W x H) 293.12 mm x 71.37 mm x 66.04 mm (11.54” x 2.81” x 2.6”)
Weight 5 lbs +/- 0.5 lbs (2.28 kg +/- 0.23 kg)
Mounting holes 4 x 5 mm (0.2”) diameter
Insertion loss <0.1 dB at 1627.15 – 1660.5 MHz
Operating Temperature
Storage Temperature
-25C to +70C
-55C to +85C
Altitude 55000 ft
Environmental Categories Refer to Environmental Qualification form inDO-160
specifications on page F-5.

Please reach out for assistance with this or any other Iridium filter requirement that you have.