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Summary of Contents for SEA 245
- Page 1 SEA INC OF DELAWARE PRELIMINARY MAINTENANCE MANUAL EXCERPTS CONCERNING TUNEUP MF/HF SSB GMDSS RADIOTELEPHONE/DSC CONTROLLER MODEL SEA 245 (c) Copyright 2001 SEA, Inc. All rights reserved. SEA, Inc. 7030 220th St. S.W. Mountlake Terrace, Washington 98043 (425) 771-2182 FAX: (425) 771-2650...
- Page 2 TABLE OF CONTENTS OPERATION ................................. 2-1 WARM UP CAUTION ............................2-1 MODE AND FREQUENCY CONTROL ......................3-1 GENERAL ................................3-1 CAUTION! FREQUENCY TOLERANCE ....................... 3-2 SETTING THE TRANSMITTER FREQUENCIES ..................3-2...
- Page 3 OPERATION WARM UP CAUTION Do not attempt to transmit until the radiotelephone is warmed up for at least 1 minute. Transmitting before the 1-minute warm-up period has elapsed can cause violation of FCC regulations.
- Page 4 3.1.1 TRANSMITTER MODE SELECTION The primary mode of operation of the SEA 245 is in the J3E (SSB with fully suppressed carrier) mode. Two auxiliary VOICE modes are also provided: R3E: SSB with pilot carrier re-inserted 16 dB below PEP.
- Page 5 Hz) and the BFO offset is set to the International Standard of 1700 Hz. AGC is fast attack, fast release. In the CW (A1A) receive mode, the receiver passband filter is shifted to narrowband (500 Hz) and the BFO offset is set to 1000 Hz. AGC is fast attack, fast release. In the AM (A3E) receive mode, the receiver passband is shifted to maximum bandwidth (4 kHz) and the received signal carrier is offset 1 kHz from the passband center.
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