Sercel LRU Appendix B Emission Designator Spec Change Update

LRU

User Manual

March 2002

To contact SERCEL

Nantes, France

Commercial; Customer Support;
Manufacturing & Repair.

B.P. 439, 16 rue de Bel Air
44474 Carquefou Cedex

Tel: [phone], Fax: [phone]
Hot-Line: Land: [phone]

Marine: [phone]

E-mail: [e-mail]

[e-mail]

www.sercel.com

St Gaudens, France

Vibrator Customer Support;
Vibrator Manufacturing & Repair;
Streamer Manufacturing & Repair.

Tel: [phone], Fax: [phone]
Hot Line: [phone]

Alfreton, U. K.

Streamer Manufacturing & Repair;
Customer Support.

Tel: [phone], Fax: [phone]

Houston, USA

Commercial; Customer Support;
Manufacturing & Repair;
Streamer Manufacturing & Repair.

Tel: [phone], Fax: [phone]

Hot-Line: [phone]
E-mail: [e-mail]

[e-mail]
[e-mail]

Ponca City, USA

Vibrator Customer Support;
Vibrator Manufacturing & Repair.

Tel: [phone], Fax: [phone]

Moscow, Russia

Commercial; Customer Support.

Tel: [phone], Fax: [phone]

Beijing, P. R. of China

Commercial; Customer Support.

Tel: [phone], Fax: [phone]

Tanggu, P. R. of China

Manufacturing & Repair.

Tel:[phone] , Fax:[phone]

Xian, P. R. of China

Manufacturing & Repair.

Tel: [phone], Fax: [phone]

Singapore

Streamer Manufacturing & Repair;
Customer Support.

Tel:[phone], Fax:[phone]

Dehradun, India

Customer Support.

Tel: [phone], Fax: [phone]
E-mail: [e-mail]

In no event shall SERCEL be liable for incidental or consequential damages or related expenses
resulting from the use of this product, or arising out of or related to this manual or the informa­tion contained in it, even if SERCEL has been advised, or knew or should have known of the
possibility of such damages.

The information included in this documentation is believed to be accurate and reliable.
However, SERCEL reserves the right to make changes to its products or specifications at any
time, without notice, in order to improve design or performance and to supply the best possible
product. This documentation does not form in any way a contractual agreement of sales
promise on the part of SERCEL.

Software mentioned in this documentation is sold under a precise licence agreement and as
such the documentation may cover technical areas for which the user may not have a final
licence.

No part of this documentation, or any of the information included herein may be modified or
copied in any form or by any means without the prior written consent of SERCEL.

Acknowledgments: All brand or product names are trademarks or registered trademarks of
their respective companies or organizations.

LRU User Manual

General

The LRU (Line Remote Unit) relay is a long range po int-t o-p oint ra di o
relay cell that can be inserted anywhere in a spread as an element of the
408UL network to re lay the data transmission o n a Line or a Transverse.
It connects to any type of 408UL field electronics (LAUX, LAUL, FDU
Link, etc.). Built in the LRU is a full per formance LAUX.

In the LRU transmission pro tocol (Half-du plex), time i s shared betwee n
transmission of Master-to-Slave messages and transmission of Slave­to-Master messages.

Master-to-Slave messages are called Network Control Sequences
(NCS), used for synchronization, zero-time transm ission and contro l.

Slave-to-Master messages are called Data Transfer Sequences (DTS),
used for data retrieval, seismonitor and collec ting test results.

1-1

Typical setups

CAUTION

If you wish to test a radio relay cell through a wireline link between the
coaxial connectors of two LRUs, use a 60 dB (minimum), 20 W
attenuator.

Attenuator

20 W
60 dB min.

Typical setups

12 V

For optimal performance of

the radio link, do not

place any electric
device (including LRU,

FDPA408, etc.) on the
same side as the radia ting
elements!

Do not raise any antenna
near electric power
distribution lines!

The antenna should be at
the top the mast.

LRU

(test setup)

8 m

LRU

12 V

NO

YES

12 V

LRU

12 V

LRU

1-2

12 V

12 V

Use the whole cable length
to keep clear fro m the anten na .

March 2002