SEA 235 User manual

SEA 235 OPERATOR’S MANUAL

Digital Single Sideband Radiotelephone

TABLE OF CONTENTS

GENERAL OPERATIONS...............................................................................1

TECHNICAL SPECIFICATIONS...................................................................1

GENERAL INFORMATION...........................................................................2

UNDERSTANDING CHANNEL MEMORY .................................................3

LCD DISPLAY CHARACTERS.....................................................................4

FRONT PANEL CONTROLS.........................................................................4

BASIC OPERATION.......................................................................................5

TURNING THE RADIO ON...........................................................................6

OPERATING THE TRANSMITTER..............................................................6

THE TUNED INDICATOR.............................................................................6

DEMAND TUNE.............................................................................................7

NOISE BLANKER OPERATION...................................................................7

SELECTING A VOICE CHANNEL................................................................8

SELECTING A TELEX CHANNEL...............................................................8

SELECTING A CHANNEL BY BIN NUMBER............................................9

CHANGING THE DISPLAY VIEW...............................................................9

ENTERING A RECEIVE ONLY FREQUENCY..........................................10

SELECTING THE EMERGENCY CHANNEL............................................10

SENDING THE DISTRESS ALARM SIGNAL............................................11

OVERRIDE....................................................................................................12

SQUELCH OPERATION..............................................................................12

CLARIFIER OPERATIONS..........................................................................12

OPERATING THE MEMORY BROWSE....................................................13

ADVANCED OPERATIONS..........................................................................14

SELECTING THE PROGRAM MENU........................................................14

STORING THE DISPLAYED FREQUENCY..............................................17

PROGRAMMING A NEW FREQUENCY...................................................19

ERASING A CHANNEL...............................................................................22

CHANGING THE NAME TAG OF A BIN...................................................23

SCANNING A CHANNEL GROUP .............................................................24

DIRECT FREQUENCY.................................................................................25

INTERCOM...................................................................................................26

FUNCTION MENUS .......................................................................................27

FUNCTION MENU OVERVIEW.................................................................27

FINDING A BIN WITH THE ALPHA MENU.............................................28

CHANGING THE MODE WITH THE MODE MENU................................29

SELECTING THE TRANSMIT POWER LEVEL........................................31

CHANGING THE DISPLAY ILLUMINATION ..........................................33

CHANGING THE SQUELCH THRESHOLD..............................................35

TABLE OF CONTENTS

SETUP MENU OPTIONS.............................................................................36

CHANGING THE KEY BEEP SETTING ....................................................39

CHANGING THE TUNER STATUS............................................................40

CHANGING THE CONTROLLER UNIT NUMBER ..................................41

CHANGING THE SSB AUDIO INPUT SOURCE.......................................41

CHANGING THE TELEX AUDIO INPUT SOURCE .................................43

CHANGING THE SSB AGC CHARACTERISTICS....................................44

CHANGING THE TELEX AGC CHARACTERISTICS..............................45

CHANGING THE VOGAD CHARACTERISTICS......................................46

AMATEUR OPERATING SYSTEM.............................................................47

THE RADIO AMATEUR OPERATING SYSTEM......................................47

FREQUENCY LISTINGS...............................................................................49

SEA 235 VOICE FREQUENCY LISTING...................................................49

DSC EMERGENCY CALLING FREQUENCIES ........................................60

SEA 235 TELEX FREQUENCY LISTING...................................................61

COAST STATIONS PROVIDING TELEX SERVICE.................................84

SEA SCRATCH PAD MEMORY LISTING.................................................85

SEA SCRATCH PAD WORKSHEET...........................................................91

SSB PROPAGATION TABLES....................................................................93

REAR PANEL..................................................................................................95

REAR PANEL CONNECTIONS...................................................................95

GLOSSARY......................................................................................................97

LIST OF FIGURES

Key Chart 1 - PROGRAM MENU 1...................................................................15

Key Chart 2 - PROGRAM MENU 2...................................................................16

Key Chart 3 - MODE MENU .............................................................................30

Key Chart 4 - POWER MENU ...........................................................................32

Key Chart 5 - DIMMER MENU.........................................................................34

Key Chart 6 - SETUP MENU 1..........................................................................37

Key Chart 7 - SETUP MENU 2..........................................................................38

GENERAL OPERATIONS

TECHNICAL SPECIFICATIONS

DIMENSIONS:

3.9” H x 10.5” W x 10.9” D

99mm H x 265mm W x 278mm D

WEIGHT:

10 Lbs.

4.5 Kgs.

ELECTRICAL:

Type Acceptance FCC Parts 80, 87, 90

FCC Identifier BZ6SEA235

Frequency Range (TX) 1.605 - 29.999 MHz

(RX) 0.490 - 29.999 MHz

Operating Temperature -30 degrees to +60 degrees C

Frequency Stability ±10 Hz

Operating Modes J3E, R3E, H3E (2182 KHz)

A1A (CW), F2B (TELEX)

Primary Voltage 13.6 V DC ± 15% (11.6 - 15.6 V DC)

Negative Rail Common to Chassis

Current Drain Receive Standby 1 Amp

Receive Full Audio 1.5 Amps

Transmit Voice 11 Amps

Transmit Two-Tone 17 Amps

Transmit TELEX 22 Amps

Output Impedance 50 ohms

Transmitter Output Power R3E, J3E 150 Watts PEP

F2B 150 Watts

LOW 50 - 75 Watts

VLOW 25 - 40 Watts

Receiver Sensitivity ≤1 µV for 12 dB SINAD

Audio Output 4 W @ ≤10% distortion into external

4 ohm load.

GENERAL OPERATIONS

GENERAL INFORMATION

CAUTION !

Do not attempt to transmit until the radiotelephone has warmed up for at least 3

minutes. Transmitting before the 3 minute warm up period can cause a violation

of the Federal Communications Commission regulations.

PROPAGATION

Medium Frequencies (MF) in the range of 300 KHz to 3 MHz propagate far

beyond the horizon. MF frequencies are generally usable within 300 miles

depending on the time of day, atmospheric conditions and man-made noise

levels.

High Frequencies (HF) in the range of 3 MHz to 30 MHz allow communications

over thousands of miles, again subject to the time of day and atmospheric

conditions. Interference tends to be more of a problem than on Very High

Frequencies (VHF) in the range of 30 MHz to 300 MHz.

To further understand MF/HF propagation, SEA’s “Mariners Guide to Single

Sideband” (MAN-0001-001) is highly recommended reading.

INSTALLATION (RF grounding & DC connections)

A radio frequency (RF) ground with a minimum of 100 sq. ft. is required for

proper operation. This ground system is not unique to SEA equipment. All

marine MF/HF radios have the same installation requirements for maximum

efficiency. Every connection to the ground should be made with a minimum of

2” wide copper strap. Proper wire size must be used between the radio and

power supply to prevent the DC (direct current) voltage at the radio from

dropping below 11.5 volts during transmit conditions. Should this occur, the

radio will drop to low power during transmit to prevent distorted transmissions.

It is recommended that an authorized SEA dealer perform the installation of your

MF/HF equipment to assure proper operation. For complete installation

instructions, refer to the “SEA 235 Installation Manual” (OPR-235-INST)

supplied with the radio.

RADIO PROTECTION

The SEA 235 monitors radio conditions such as DC supply voltage, internal

temperature and antenna VSWR. When these conditions are outside the preset

limits, the radio will revert to low power (approximately 75 Watts). The

display’s LOW indicator will light to indicate this condition. If this should occur

during an EMERGENCY situation, pressing will

override the monitoring sensors and allow FULL output power. The radio will

stay in the EMERGENCY OVERRIDE condition until the radio power is re-

cycled.

6FNC

GENERAL OPERATIONS

UNDERSTANDING CHANNEL MEMORY

CHANNELS

Nearly 1000 frequency pairs are stored as permanent channels in the SEA 235.

These channels are recalled by their assigned ITU or SEA channel number. ITU

numbers are known internationally and include all duplex frequency pairs

starting at 4 MHz and ending with 25 MHz. SEA numbers are assigned to those

frequencies that do not have an assigned ITU number. Currently all 2 to 3 MHz

frequencies and all simplex frequencies are assigned SEA channel numbers.

It is important to note that not all radios use the same channel numbers for

simplex or 2 to 3 MHz frequencies. Some radios use an “A”, “B”, “C” channel

assignment for frequencies not assigned an ITU channel number. For example,

if you refer to the SEA simplex channel 451 during communications, the person

you are communicating with may not have a channel 451. Their radio may have

the same frequency (4146.0 KHz) assigned to channel “4A”. For reliable

communications, always refer to the frequency when referencing simplex

channels or frequencies below 4 MHz.

BINS

In addition to the permanent memory, 200 user programmable channels known

as bins have been assigned for “scratchpad” memory. Approximately 170 of

these 200 channels have been programmed by SEA but may be changed at any

time. Bins may be programmed with any frequency, mode of transmission and

given a name tag besides a bin number.

SCAN CELLS

Consecutive bin numbers that have the same first three characters in their name

tag, are known as “scan cells”. SEA has programmed 170 of the 200 possible

bins into 23 different scan cells. Scan cells may be as short as one bin or as long

as 200 bins but should be kept to a reasonable length for scanning efficiency.

Each scan cell is organized with frequency pairs that are related to one another.

For example, bins 13 through 30 have been programmed with frequencies

assigned to the coast station KMI. Since the name tag’s first three characters are

“KMI”, and the bins are consecutively numbered, the bins may be scanned as a

group. If the bins do not have the same first three characters, the scan cell will

be split into two different cells. For instance, if bin 20 is renamed to “SEA 1”,

the KMI scan cell will be split into two cells. One cell will contain bins 13

through 19, while the other cell will contain bins 21 through 30. Bin 20 will be a

single channel scan cell called “SEA”. Scanning “KMI” could be done by

scanning bins 13 through 19 OR bins 21 through 30 but not both at the same

time.

Care should be given that a scan cell is not split unintentionally. Bins that will

not be scanned can be given any descriptive name tag.

GENERAL OPERATIONS

LCD DISPLAY CHARACTERS

Alphanumeric digits display channel numbers, frequencies and menus.

The NOISE BLANKER is activated.

The radio is in TRANSMIT.

The attached coupler has finished the tune process.

Indicates ½output power during transmit when on steady or

¼output power when flashing.

The radio will transmit a reduced carrier (H3E) of approximately 40W.

This mode is only available on the emergency frequency 2182.0 KHz.

Both transmit and receive will use LOWER SIDEBAND mode.

TELEX (J2B) mode will be used for transmit and receive.

The receiver SQUELCH is activated.

Relative output power when transmitting and audio signal strength

during receive. No bars indicates weak signal.

FRONT PANEL CONTROLS

Toggles power on/off.

Used to enter channel/frequency information and menu selections.

used alone, recalls emergency frequency 2182.0 KHz.

Toggles alarm generator test on/off.

Enables receiver noise blanker. When used with ,

transmits alarm signal.

Toggles squelch on/off.

Toggles display to show channel / bin #, frequency, or alpha name.

Accesses function menus and other function commands.

Selects displayed funtion menu or completes keyed entry.

Increases receiver frequency and scrolls selected function options.

Decreases receiver frequency and scrolls selected function options.

ENT

TND

LOW

AME

LSB

TLX

SQL

0 – 9

PWR

ALRM

SEND

SQL

FNC

ALRM

2182

GENERAL OPERATIONS

BASIC OPERATION

To turn the radio on, press

Wait 3 minutes for the synthesizer frequency

to stabilize before transmitting.

Rotate the volume control clockwise to

increase the volume level.

Press to activate the squelch.

Enter the desired channel number in three or

four digit form, followed by the key.

e.g.

The display will show the channel number for 2 seconds then change to display

the receive frequency.

Your SEA 235 is now set to transmit and receive on the selected channel.

For instructions on enabling other radio functions, see the table of contents for

the page number corresponding to the specific function.

Illustrations in this manual reflect the use of an attached SEA 1635 tuner. Differences in

tuner choice or radio programming may produce varying displays.

LOW SQL

TND

LOW SQL

451ENT

ENT

SQL

PWR

SEND SQL CH

PWR ALRM

FNC

2182

ENT

TX TND

LOW AME

LSB TLX

SQL

SEA 235 HF/SSB DIGITAL

RADIOTELEPHONE

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