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- Page 1 SEA COM CORPORATION. PRELIMINARY MAINTENANCE MANUAL VHF FM RADIOTELEPHONE & DSC CONTROLLER MODEL SEA 157S © Copyright 2010 SEA COM Corp. All rights reserved. SEA COM Corp. 7030 220th St. SW Mountlake Terrace, Washington 98043 TEL: (425) 771-2182 FAX: (425) 771-2650...
- Page 2 **IMPORTANT** NOTICE TO INSTALLERS ------------------------------------------------------------------ NOTE: The safe compass distance for this equipment (As defined in Paragraph 29 of IEC Publication 92-101, Third Edition): SEA 157S VHF FM TRANSCEIVER/DSC CONTROLLER = 2.0 meters ------------------------------------------------------------------...
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Page 3: Table Of Contents
PAGE INTRODUCTION..........1-1 SEA 157S SPECIFICATIONS.........2-1 General..........2-1 Transmitter........2-1 Receiver...........2-2 Mechanical.........2-2 DSC controller........2-3 OPERATING THE SEA 157S........3-1 Front Panel Controls.......3-1 Display..........3-1 Push To Talk........3-1 Radiotelephone Operating System Functions..3-2 Digital Selective Calling Operating System..3-7 Using Test, Calibration and Diagnostic Utilities...3-13 USA Frequency List.........3-14 International Channel list......3-15... - Page 4 FIG. ___________________DESCRIPTION___________________ Page Front view of SEA 157S......2-4 Rear view of SEA 157S......2-5 Outline Dimensions of SEA 157S.....4-3 Flush Mount Kit Drill Template for SEA 157S..4-4 Transmitter test setup......6-7 Receiver test setup........6-8 Functional Block Diagram......7-1 7.2.1 RF Mainboard Schematic Diagram, Sheet 1....7-2 7.2.2...
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Page 5: Introduction
SEA 157S Operator's Handbook (SEA P/N OPR-157S) supplied with each SEA 157S. SEA COM Corp. continually strives to improve its products so that we may better serve our customers. SEA COM reserves the right to make changes to SEA 157S specifications, hardware, software or documentation at any time without notice. -
Page 6: Sea 157S Specifications
SEA 157S SPECIFICATIONS: GENERAL FREQUENCY RANGE: TX 155-159MHz US TX 156.0-157.5MHz RX 155-164MHz FREQUENCY RESOLUTION: 12.5kHz CHANNELS: All US, Canadian, Int'l plus 10 WX POWER REQUIREMENT: Voltage: 13.6Vdc, +/-15% Negative Ground CURRENT: Max TX: 5.5 Amps (25W) 1.0 Amps (1W) RX (STBY): 0.4 Amps... -
Page 7: Receiver
RECEIVER FREQUENCY RANGE: Simplex 155-159MHz Semi-duplex 159-164MHz INTERMEDIATE FREQUENCIES: 21.4MHz, 450kHz SENSITIVITY: <0.3uV for 12 dB SINAD AUDIO FREQUENCY RESPONSE: Within +1,-3 dB of 6 dB per octave de-emphasis from 300- 3000Hz AUDIO OUTPUT: 4W at less than 10% distortion into external 4 ohm load. - Page 8 SEA 157S VHF DIGITAL SELECTIVE CALLING CONTROLLER Digital Selective Calling Controller incorporated into the SEA 157S VHF Radiotelephone has been designed to comply with all FCC regulations given in 47 CFR 80.225. This encompasses compliance with the following documents, which are included for reference: 80.225(a)
- Page 9 SEA 157S Front View Figure 2.1 Page 2-4...
- Page 10 SEA 157S Rear View Figure 2.2 Page 2-5...
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Page 11: Operating The Sea 157S
The display will turn off, indicating that the radio is powering down to the off condition. DISPLAY The SEA 157S uses a 128 X 64 graphics LCD display. The display is back-lighted and operates interactively with the keypad to provide effective... -
Page 12: Radiotelephone Operating System Functions
RADIOTELEPHONE OPERATING SYSTEM FUNCTIONS 3.4.1 CHANNEL SELECTION The rotary control is used to select the channels. Push the ENT key until “Change Channel” is seen on the middle right side of the display, then rotary control select desired channel. This operates within the current channel list and wraps around at both ends of the list. - Page 13 1W only channel, the FUNC key may be held down while transmitting to temporarily switch to 25W. 1W will be displayed when in the 1W mode and 25W when in the 25W mode. 3.4.8 DUAL WATCH 157S watch modes available. Dual...
- Page 14 3.4.9 SEEK The Seek mode scans all channels in the selected list (USA/INT/WX) and is started by pressing FUNC-3. The display will show SCN and the radio will scan all the channels in the current list. 3.4.10 SCAN The Scan function is initiated by briefly pressing the FUNC-2. The display will show SCN and the radio will scan the channels that are members of the Scan List (indicated by the MEM flag).
- Page 15 The rotary control is used to scroll through the list of menu options. If a particular configuration needs to be changed, press the ENT key to open the edit page. Some edit pages contain more than one configurable option with the cursor pointing to the edit field.
- Page 16 3.4.14.3 Radio Controls This Configuration page contains a number of general radio operation options. Beep Level Use the rotary control to select the beep volume level, 0-16. The radio will emit a short beep for every turn of the rotary control. Scan Hang Time Use the rotary control to select the amount of time the radio in Scan remains on a channel after the squelch closes, in 0.5 second increments, from 0 to...
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Page 17: Digital Selective Calling Operating System
Add New Selecting Add New will open a blank entry page where a Name and Number may be added. The Name may be up to 15 characters long. The DSC ID field is 9 digits. The Phone Number may be up to 18 digits. Edit Selecting Edit will allow the current entry to be modified. - Page 18 After selecting the distress condition and manually entering the position, press and hold the distress key for 5 seconds to send the distress call. The radio will wait for an acknowledgment from the coast station and automatically resend the DSC message approximately every 4 minutes if a coast station does not respond.
- Page 19 3 .5.3 INDIVIDUAL DSC CALL A routine Individual DSC Call is used to address another station and propose a working voice channel. This type of call requires the receiving station to send a response. Start by selecting the desired working channel you want to use. Press FUNC-8 to access the DSC Menu.
- Page 20 3.5.6 RECEIVING A DSC CALL The SEA 157S constantly monitors CH70 using a dedicated watch receiver. When a DSC call is received, the radio will beep quickly 2 times every 5 seconds. This alert tone will continue for 2 minutes or until the user presses a keypad key or the PTT switch, at which time the alert tone will cease.
- Page 21 3 .5.7 REVIEWING THE DSC CALL LOGS 3.5.7.1 Routine DSC Calls The radio retains the last 50 received DSC calls in the DSC Log. To view the log, press FNC-8 to access the DSC Menu. Use the rotary control to select Review DSC Log, then press ENT. All information about the received call, including the received time and date, will be displayed.
- Page 22 Distress Event active, that been acknowledged, and the event is more than 5 minutes from the original distress call, then the operator may initiate a Distress Relay* or a Distress Acknowledgement**. While viewing the Distress Event, press the ENT key. A prompt will allow selection of a Broadcast Relay, Addressed Relay or Acknowledgement.
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Page 23: 3.6 Using Test, Calibration And Diagnostic Utilities
Prompts will appear for additional information as required. Once the DSC message construction is complete, instructions will be given to send the DSC call. See Appendix D in OPR-157S for details on the information fields. 3.6 USING TEST, CALIBRATION AND DIAGNOSTIC UTILITIES Enter the service menu by pressing FUNC-ENT and entering the service menu activation code (contact the factory with the radio’s... - Page 24 3.6.3 DSC TONE TRANSMIT Select the ‘DSC DOT’, ‘DSC 1300' or ‘DSC 2100' selection from the service menu. Press ENT and the 3 digit display will show ‘ON’, and pressing PTT will transmit the selected DSC tone or dot pattern. Press ENT to exit to the main service menu. Press FUNC to exit the service menu.
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Page 25: International Channel List
Public Correspondence 157.425 Public Correspondence 157.425 Commercial Intership 3.8 International Channel listing NOTE: Amended International Channel List is identical to the SEA 157S International Channel List with the following exceptions: Channel SHIP TX Ch. Designation 156.050 Canada Public Correspondence .............. -
Page 26: Weather Channel List
3.9 Weather Channel listing CH Smpx 25W SHIPRX SHIPTX 162.550 WEATHER 1 162.400 WEATHER 2 162.475 WEATHER 3 163.275 WEATHER 4 161.650 WEATHER 5 162.775 WEATHER 6 162.425 WEATHER 7 162.450 WEATHER 8 162.500 WEATHER 9 162.525 WEATHR 10 3-16... -
Page 27: Installation
Section 6 of this manual for more detailed procedures. SHELF OR OVERHEAD MOUNTING: See Figure 4.1 for dimension drawings of SEA 157S. BULKHEAD MOUNTING: See Figure 4.2 for Flush Mount Kit Drill Template for SEA 157S special bulkhead mounting bracket... -
Page 28: External Speaker Wiring
SEA 157S. A computer can be connected to the RS232 port of the SEA 157S. Connections for both of these ports can be made at the 8 pin round connector on the rear panel next to the main... -
Page 31: Theory Of Operation
Section 7 of this manual. See the List Of Figures for aid in locating applicable reference drawings. FREQUENCY SYNTHESIZER: GENERAL: Refer to the functional block and schematic diagrams. The SEA 157S makes use of a multi-loop synthesizer system to provide conversion frequencies Receiver, Transmitter. -
Page 32: Modulation Circuit
MASTER REFERENCE OSCILLATOR:The master clock is provided by highly stable VCTCXO at 21.85mHz Y1. This oscillator has a specified frequency stability of +/-1ppm from –20 to 70 degrees C. The oscillator output is connected the input of the CMOS gate of the synthesizer IC, U10 pin 1. - Page 33 The signal strength is increased by Q1 and passed through the double tuned matching network made up of C8, L4, C9, L6, C10, and C11 to the input of the signal splitter formed by T1,R7, and R6. One output of the signal splitter is applied to the input of double balanced diode ring mixer U1 while the other output of the splitter is sent to the Channel 70 receiver.
- Page 34 DIGITAL SQUELCH PROCESSING: As described above, the digitized receiver audio is filtered by a 3 KHz high pass filter and fed to the digital squelch processor. It is similar to a traditional noise activated squelch. The DSP calculates the magnitude of audio energy above and below 3 KHz and uses this in conjunction with the squelch threshold setting to intelligently decide whether to open or close the digital squelch gate.
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Page 35: Transmit Amplifier Chain
TRANSMIT AMPLIFIER CHAIN: GENERAL: Referring to Sheet 4 of the Mainboard Schematic Diagram, the transmit amplifier chain of the SEA 157S consists of the discrete RF amplifiers Q10 and Q9 and a two-stage hybrid RF power amplifier module U16. PRE-DRIVERS:... -
Page 36: Automatic Rf Power Control (Apc) And Tx Logic
CODEC U8 to U11 where it is amplified up to a maximum of 4 watts. Most of the SEA 157S internal circuitry is powered from the 13 volt switched (13VSW) bus. This is derived directly from the fused and filtered input voltage from the main power source via Q1-A. -
Page 37: Microcomputer Circuitry
SERIAL PORTS: The SEA 157S hosts one NMEA0183 port and one RS-232 type port. The NMEA0183 input port is optically coupled to the CPU through U8; the output is provided via FET transistor Q4. The RS... -
Page 38: 5.10 Keypad/Keypad Lighting
This protects the radio in the unlikely event that the CPU should fail to function properly. 5.10 KEYPAD/KEYPAD LIGHTING: KEYPAD: Primary control of the SEA 157S is through the 15 key keypad. This keypad is of the conductive rubber type and is backlit... -
Page 39: Maintenance
MAINTENANCE NOTE: In order to avoid making unnecessary adjustments it is best to first assess the basic transceiver performance using the steps outlined in Section 6.3 below. GENERAL BASIC DISASSEMBLY: NOTE: disassembly unit generally required calibration of the unit. Prepare clean surface work... -
Page 40: Basic Performance Tests
BASIC PERFORMANCE TESTS: GENERAL: NOTE: No disassembly is required to perform basic performance tests. The orange audio output wire and the yellow internal speaker wire must connected together internal speaker operation is desired. DISPLAY/KEYPAD AND MAIN MEMORY CHECK: When the main power is turned display will... -
Page 41: Transmitter Alignment
BASIC RECEIVER TESTS: Set up the equipment as shown in Figure 6.2, "Receiver Test Setup". RECEIVER SENSITIVITY AND AUDIO POWER CHECK: Select the USA channel list. Set both the receiver and signal generator frequency channel (156.800mHz). squelch threshold to open. Apply 1000 Hz sinusoidal, 3 KHz peak deviation modulation to the signal generator. - Page 42 Enter the service menu by pressing FUNC-ENT and entering the service menu activation code. various adjustments selectable by rotating the front panel control and pressing ENT when the desired adjustment is displayed. The service menu allows adjustment of deviation, clock frequency, 1W power level, 25W power level.
- Page 43 TRANSMITTER PEAK FREQUENCY DEVIATION: NOTE: The DSP transmit audio processing adjusts the audio gain to a wide range of audio input levels. The deviation adjustment sets the transmitter deviation level and is not a microphone gain adjustment. Once properly factory set it should not require readjustment for the life of the unit.
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Page 44: Receiver Alignment
RECEIVER ALIGNMENT: GENERAL: receiver factory aligned field serviceable adjustments. specific receiver performance problems identified, contact factory return authorization.
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