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SEA COM CORPORATION.

PRELIMINARY MAINTENANCE MANUAL

VHF FM RADIOTELEPHONE & DSC CONTROLLER

MODEL SEA 157S

SEA COM Corp.

7030 220th St. SW

Mountlake Terrace, Washington 98043

TEL: (425) 771-2182

FAX: (425) 771-2650

101

019A

Содержание 157S

Страница 1: ...ARY 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 101019A ...

Страница 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 ...

Страница 3: ...4 1 4 2 Shelf or Overhead Mounting 4 1 4 3 Bulkhead Mounting 4 1 4 4 Power Supply Wiring 4 1 4 5 Antenna Wiring 4 1 4 6 External Speaker Wiring 4 2 4 7 NMEA 0183 and RS232 Wiring 4 2 5 THEORY OF OPERATION 5 1 5 1 Frequency Synthesizer 5 1 5 2 Modulation Circuit 5 2 5 3 Main Receiver 5 2 5 4 Transmit Amplifier Chain 5 5 5 5 Antenna Interface Circuits 5 5 5 6 Automatic RF Power Control APC and TX Lo...

Страница 4: ...Block Diagram 7 1 7 2 1 RF Mainboard Schematic Diagram Sheet 1 7 2 7 2 2 RF Mainboard Schematic Diagram Sheet 2 7 2 7 2 3 RF Mainboard Schematic Diagram Sheet 3 7 4 7 2 4 RF Mainboard Schematic Diagram Sheet 4 7 5 7 2 5 RF Mainboard Schematic Diagram Sheet 5 7 6 7 3 VCO Board Schematic Diagram 7 7 7 4 Receiver Board Schematic Diagram 7 7 7 5 1 CPU Mezzanine Board Schematic Diagram Sheet 1 7 8 7 5 ...

Страница 5: ... 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 SEA COM s Marine Service Department is always available to provide additional help with technical difficulties Please call SEA COM s Service Department to obtain a Return Authorization Number RA before shipping equipment to S...

Страница 6: ...4 Amps RX Max 1 0 Amps FUSES 7 5 Amps External 2 2 TRANSMITTER EMISSION 16K0F3E 11K2F3E Voice 13K5G2D DSC 11K2F2D GMSK POWER OUTPUT 25W 1W into 50 ohms SPURIOUS EMISSIONS 80 dB or better SPURIOUS RADIATION Complies with FCC 80 211 f AUDIO HARMONIC DISTORTION 10 max AUDIO FREQUENCY RESPONSE 1 3dB of 6 dB octave Pre emphasis 300 3000 Hz HUM AND NOISE 50 dB FREQUENCY DEVIATION 5kHz max peak CARRIER F...

Страница 7: ...ernal HUM AND NOISE Unsquelched 45dB Squelched 55dB ADJACENT CHANNEL SELECTIVITY 80dB 25kHz 85dB 50kHz SPURIOUS EMISSION RADIATION Complies with FCC SQUELCH SENSITIVITY Threshold 2uV max Tight max 10dB above reference sensitivity RECEIVER ATTACK TIME Less than 100mSec RECEIVER CLOSING TIME 100msec typical 250mSec max SCAN RATE Max 10 channels second MODULATION ACCEPTANCE 6kHz minimum 7kHz typical ...

Страница 8: ...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 ITU R Recommendation M 493 9 Class D 80 225 a RTCM Paper 56 95 SC101 STD 2 3 ...

Страница 9: ...Page 2 4 SEA 157S Front View Figure 2 1 ...

Страница 10: ...Page 2 5 Figure 2 2 SEA 157S Rear View ...

Страница 11: ...ay provides an operating system which permits the operator to control both the radiotelephone and digital selective calling DSC features of the SEA 157S 3 1 3 PWR Key Press and hold the PWR key for 3 seconds then release to turn the radio on The display will light indicating the radio is powered To turn the radio off press and hold the PWR key for 3 seconds then release The display will turn off i...

Страница 12: ...s 0 5 to go to channel 5 immediately Press 6 and pause for 10 seconds and the radio will switch to channel 6 In the Weather list the operation is similar to this if the 2 through 9 keys are pressed in WX mode the channel is selected immediately because there are only 10 weather channels available If 0 is pressed then the channel number from 1 to 9 is waited for with the first digit blinking If 1 i...

Страница 13: ...ld 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 The SEA 157S has two watch modes available Dual watch is initiated by pressing FUNC 1 briefly while on the primary channel you want to monitor DW will be indicated on the display and channel 16 will be checked every 2 seconds while there is no activity on e...

Страница 14: ...function to tag current channel If the selected channel is already in the list menu selection reads Del from Scan List Pressing the ENT key adds or removes the current channel from the scan list The MEM flag will be on if the current channel is included in the scan list The memorized channels can be scanned by using the MODE 2 scan function 3 4 13 PRIORITY CHANNEL PROGRAMMING Pressing FUNC 4 switc...

Страница 15: ...16 has priority and is checked every 2 seconds regardless of activity on other channels Triple W All Chan Stops on the first active channel atch Options Chan 16 Channel 16 has priority and is checked every 2 seconds regardless of activity on the Primary or the Priority Channel PRI Chan The Priority Channel has priority and is checked every 2 seconds regardless of activity on CH16 or the Primary Ch...

Страница 16: ...e returning to the default mode selected above Allows selection of 0 59 0 to 30 seconds 3 4 14 4 Scrambl Use the rotary control to select the scrambler code from 0 to 9 to use in the Scrambler mode Selecting 0 turns off the Scrambler e Options 3 4 14 5 Channel When this function is selected the first digit of the channel name will begin to flash Use the keyboard keys to enter a new character or th...

Страница 17: ...enu item will display the radio s current DSC ID Press ENT key to open the edit mode then use the keypad keys to modify the ID Press ENT to save the changes Press the FUNC key to return to the Configuration Menu Pressing 16 or DIST key will exit immediately without saving any changes NOTE The DSC ID may be changed only twice after factory initialization 3 5 DIGITAL SELECTIVE CALLING OPERATING SYST...

Страница 18: ...ess Relay calls and All Ship calls for the purpose of warning For all other calls that do not fit one of these predefined categories the operator may compose a call using the Build Class A operation Class A formats allow all call types to be generated including geographic area calls group calls non voice fax and data calls position request and polls The 16 key may be used to abort the DSC call at ...

Страница 19: ... station Press ENT to initiate the DSC call 3 5 5 PLACING A TELEPHONE CALL WITH DSC The DSC call system may be used to set up a telephone call through n appropriately equipped coast station a To initiate a phone call press FNC 8 to access the DSC Menu Using the rotary control to move the cursor select the DSC Phone Call menu item then press ENT The most recently contacted coast station s DSC ID an...

Страница 20: ...ormal operating mode when the channel selector is changed or a key is pressed When an Individual Call is received additional action may be taken automatically depending on the setting of the DSC ACK mode setup menu If an automatic reply has been selected then the acknowledgment will be sent and the radio will switch to the voice channel selected by the calling station If the manual reply mode is s...

Страница 21: ...one number Line 2 Received from DSC ID or name Line 3 UTC Time Date for when the call was received Line 4 Call Duration Channel Frequency Position Line 5 ACK Status Line 6 Telecommand 1 Line 7 Telecommand 2 Information displayed for DISTRESS CALL RELAY or ACK message Line 1 Message number and Distress Call ACK Relay Line 2 Received from DSC ID or name Line 3 UTC Time Date for when the call was rec...

Страница 22: ... Time Date of original distress call Line 2 The DSC ID or name for the vessel in distress Line 3 Nature of the Distress Line 4 Position Time of Position Fix Line 5 Current status Distress Relay ACK Line 6 The source DSC ID for the Relay or Acknowledgement Line 7 Time Date of last DSC call for this event 3 5 7 3 MISSED CALLS If a received DSC call is not acknowledged by pressing the PTT switch or a...

Страница 23: ... 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 serial number to receive the activation code A menu allowing you to adjust the clock frequency 1W power level 25W power level an...

Страница 24: ...VTS Commercial 12 S 156 600 VTS Port Ops 13 S 156 650 Bridge to Bridge Navigational Manual override to 25 watts 14 S 156 700 VTS Port Ops 15 S 156 750 RX only Coast to Ship Environmental 16 S 156 800 DISTRESS AND CALLING 17 S 156 850 Maritime Control 18A S 156 900 Commercial 19A S 156 950 Commercial 20 D 157 000 Port Ops 20A S 157 000 Port Ops Intership 21A S 157 050 U S Govt ONLY USCG 22A S 157 1...

Страница 25: ...82A S 157 125 U S Govt ONLY 83A S 157 175 U S Govt ONLY 84 D 157 225 Public Correspondence 85 D 157 275 Public Correspondence 86 D 157 325 Public Correspondences 87 D 157 375 Public Correspondence 88 D 157 425 Public Correspondence 88A S 157 425 Commercial Intership 3 8 International Channel listing NOTE Amended International Channel List is identical to the SEA 157S International Channel List wit...

Страница 26: ...IPTX Tag 1 D N 162 550 WEATHER 1 2 D N 162 400 WEATHER 2 3 D N 162 475 WEATHER 3 4 D N 163 275 WEATHER 4 5 D N 161 650 WEATHER 5 6 D N 162 775 WEATHER 6 7 D N 162 425 WEATHER 7 8 D N 162 450 WEATHER 8 9 D N 162 500 WEATHER 9 10 D N 162 525 WEATHR 10 3 16 ...

Страница 27: ...positive power lead to the positive supply rail The BLACK negative power lead connects to the negative supply rail NOTE The chassis of the SEA 157S is connected to the negative supply rail CAUTION If the power wires are connected backward i e reverse polarity and power is accidentally applied to the radiotelephone the fuse will blow It is also likely that the reverse polarity protection diode D2 w...

Страница 28: ...maximum audio volume the external speaker should be a high efficiency 4 Ohm type rated for 4 watts minimum NOTE Do not attempt to use the ship s ground for audio circuits Often confusing audio problems can be avoided if none of the external speaker wiring is allowed to contact the ship s ground 4 7 NMEA 0183 INPUT OUTPUT RS232 WIRING A navigation signal such as from a GPS receiver can be connected...

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Страница 31: ...and two stage buffer is on a separate pc board located in a shielded pocket in the chassis casting VCO RF AMPLIFIERS Q4 and Q3 amplify the VCO signal up to 10 dBm 10 mW nominal The signal is then fed to the receiver mixer U3 via a resistive attenuator and also to the transmitter pre driver Q10 via the Main Board diode D3 D3 is turned on only during transmission to supply approximately 10 dBm excit...

Страница 32: ...pass filter This method maximizes the average voice energy within the set deviation limit while minimizing audio harmonic distortion levels DSC DATA The digital modulation signal is generated internally in a phase continuous digital sine wave generator It is then feed into the transmitter audio processing within the DSP at the input of the pre emphasis and then applied at a level below the limitin...

Страница 33: ...c filter FL3 The output of FL3 is returned to the input of the second IF amplifier located within U2 The output of the second IF amplifier is passed out of the FM IF system U2 to the input of the analog switch U3 Depending on the logic level on pin 10 of the analog switch U3 the signal will be routed through the 7 5KHz 2 pole ceramic filter FL4 or the 15KHz 2 pole ceramic filter FL5 and returned t...

Страница 34: ...led oscillator doubler circuit consisting primarily of Y1 L6 Q2 L7 L8 and their associated components The overtone crystal Y1 operates at 67 5625mHz and frequency trimming is provided by L6 The crystal frequency is doubled by Q2 and the resulting 135 125mHz LO signal is filtered by the bandpass filter consisting of L7 L8 and their associated capacitors 21 4mHz Filter First IF AMPLIFIER The output ...

Страница 35: ...ver only produce RF power when the radio is in the transmit mode and the RF signal from Q9 is available at the module input IN The amount of RF output produced by the power amplifier module is dependent on the level of bias voltage available to pin 2 PA of the power amplifier module and to Q9 via R5 R6 and L5 This bias voltage is controlled by the amplifier consisting of Q5 Q13 and their associate...

Страница 36: ...e APC system will closely maintain the 1W or 25W output level as selected over a wide range of power supply voltage and ambient temperatures In the unlikely event that the automatic power control system should fail the power amplifier cannot produce much more 30 watts 5 7 TX LOGIC DETECTOR The DC level from rectifier D34 which is used by the above APC circuit is also used by the CPU to determine w...

Страница 37: ...d DSC modem data is returned to the CODEC for conversion to analog prior to output to the transmitter or speaker CODEC U8 is a Texas Instruments TLV320AIC23B high performance stereo audio CODEC The CODEC handles the conversion of analog transmit and receiver audio to the digital domain for processing by the DSP The CODEC also handles the conversion of the digital data containing the processed tran...

Страница 38: ...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 with internal LEDs The keypad PCB contacts and backlighting components are part of the Mainboard PCB The backlighting LEDs are configured in four series stri...

Страница 39: ...eturn authorization if the main PCB is damaged 6 2 RECOMMENDED TEST EQUIPMENT 1 13 6 volt regulated DC power supply with ammeter rated for minimum 6 amps continuous duty 2 Calibrated RF wattmeter Bird Model 43 with 25 watt and 1 watt 150mHz elements and a 50 ohm 25 watt load or power attenuator 3 Volt ohmmeter plus RF probe eg Fluke 75 plus Fluke 85RF probe 4 VHF frequency counter accurate to 10 H...

Страница 40: ...r USA Channel 16 is recommended BASIC TRANSMITTER TESTS Set up the equipment as shown in Figure 6 1 Transmitter Test Setup 1 TRANSMITTER FREQUENCY AND POWER CHECK Key the transmitter on channel 16 156 800mHz The frequency should read within 780 Hz of the assigned frequency at room temperature The wattmeter should read 25 2 watts in the 25 watt mode and 0 7 to 1 0 watt in the 1 watt mode Repeat thi...

Страница 41: ...erator RF amplitude at minimum setting and increase slowly until the squelch just opens The signal generator amplitude should not exceed 0 2 microvolts 121 dBm 3 MODULATION ACCEPTANCE CHECK This test checks for proper alignment of the receiver Set the signal generator and receiver to channel 16 156 800mHz Set the signal generator modulation to 1 KHz sinusoidal 3 KHz peak deviation Set the signal g...

Страница 42: ...he radio on any desired channel Enter the service menu and select the CLKTUN mode Push microphone push to talk button PTT to key transmitter on any desired channel Rotate the front panel control until the transmitter is within 100 Hz of the assigned frequency The display will show an adjustment of 0 200 and will typically be approximately 100 Press ENT to store the setting All other transmitter an...

Страница 43: ... that the deviation does not exceed 5 KHz peak under any amplitude condition up to at least 400 millivots RMS at the microphone terminals Remove the series dropping resistor from the audio generator path if necessary to achieve this audio drive level Disconnect the audio generator Key the transmitter and speak loudly into the microphone to verify that the frequency deviation does not exceed 5 KHz ...

Страница 44: ...RECEIVER ALIGNMENT GENERAL The receiver is factory aligned and has no field serviceable adjustments If specific receiver performance problems are identified contact the factory for return authorization 6 6 ...

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Страница 47: ...B15E03 CLKTN TXAF PLLCS SPI DO SPICLK Q2 Q4 Q3 Y1 21 850MHz R N U12 U12 3VTX ONKEY LCD DISPLAY CONTRAST U17 KEYPAD 1 25W CLKTN Q1B Q1A Q2 Q3 Q14 Q8 Q7 U7 TLV5628 LEDS D17 D32 13VSW 128 X 64 13TX 13VSW U21 13VSW SPKR AF FLASH uC U1 9 8304MHz Y1 DSP U13 SERIAL FLASH REAL TIME CLOCK CODEC WATCH RESET DOG TMP XXXX SPI_DO RS232 NMEA CH70 AF RX AF TX AF RXAF OUT SPICLK PLLCS Y2 32 768KHz DISPLAY KEYPAD ...

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Страница 55: ...SEA157S Mezzanine P11 sch 2 Fri Aug 06 14 02 03 2010 ...

Страница 56: ...SEA157S Mezzanine P11 sch 1 Fri Aug 06 14 05 25 2010 ...

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