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About this Manual
This manual provides installation and operation information for the Comtech EF Data CDM-Qx
Multi-Channel Modem with DoubleTalk™ Carrier-in-Carrier
intended for earth station engineers, technicians, and operators responsible for the operation and
maintenance of the 70-140 MHz CDM-Qx and its L-Band counterpart, the CDM-QxL.
Revision 7 denotes a complete rewrite of the CDM-Qx Multi-Channel Satellite Modem Installation
and Operation Manual (CEFD P/N MN/CDMQX.IOM). It is intended replace all previous versions
of this document in their entirety. All content has been reorganized and updated to conform to
current Comtech EF Data Technical Publications Standards and Practices.
Reporting Comments or Suggestions Concerning this Manual
Comments and suggestions regarding the content and design of this manual will be appreciated.
To submit comments, please contact the Comtech EF Data Technical Publications Department:
Conventions and References
Metric Conversion
Metric conversion information is located on the inside back cover of this manual. This information
is provided to assist the operator in cross-referencing non-metric to metric conversions.
TechnicalPublications@comtechefdata.com
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PREFACE
®
. This is a technical document
.
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