SEA 235 Operator's 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 265 mm 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

Operating Temperature -30 degrees to +60 degrees C Frequency Stability Operating Modes J3E, R3E, H3E (2182 KHz)

(RX) 0.490 - 29.999 MHz

± 10 Hz

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 Audio Output

≤ 1 µV for 12 dB SINAD

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 MH z 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 furthe r understand MF/HF propagation, SEA’s “Mariners G ui de 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. Thi s 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 recycled.

FNC

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 assigne d ITU number. Currently all 2 to 3 MHz frequencie s 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 t he 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 be si des 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 thr ough 30 but not both at t he 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.

TND

LOW

AME

LSB

TLX

SQL

The NOISE BLANKER is activated. The radio is in TRANSMIT. The attached coupler has finished the tune process. Indicates ½ output power during transmit when on steady or

output 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

PWR 0 – 9

ALRM

SEND

SQL

CH FX

FNC ENT

UP DN

Toggles power on/off. Used to enter channel/frequency information and menu selections.

2182

used alone, recalls emergency frequency 2182.0 KHz. Toggles alarm generator test on/off. Enables receiver noise blanker. When used with ,

ALRM

transmits alarm signal. Toggles squelch on/off. Toggles display to show channel / bin #, frequency, or alpha name. Accesses function menus a nd 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.

SEA 235

HF/SSB DIGITAL

RADIOTELEPHONE

NBTXTND

LOW

AME

LSB

GENERAL OPERATIONS

TLX SQL

4 7

FNC

2182

ENT

PWR

ALRM

SEND

SQL

BASIC OPERATION

To turn the radio on, press

Wait 3 minutes for the synthesizer freque ncy to stabilize before transmitting.

Rotate the volume control clockwise to increase the volume level.

Press to activate the squelch.

SQL

PWR

CH FX

TND

LOW SQL

Enter the desired channel number in three or four digit form, followed by the key.

e.g.

4 5 1 ENT

ENT

LOW SQL

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.

GENERAL OPERATIONS

TURNING THE RADIO ON

Press

All display segments will be shown for a short period followed by the radio model number, then the controller (CT) and transceiver (RT) software versions. The radio will then be set to the MARINE mode on international emergency frequency 2182.0 KHz using USB, J3E mode.

Wait 3 minutes for the synthesizer freque ncy to stabilize before transmitting.

PWR

NBTXTND

LOW

AME

LSB

TLX

SQL

OPERATING THE TRANSMITTER

Keying the microphone push-to-talk button will switch the transmitter circuits on, indicated by the “TX” indicator appearing on the display. Speak in a normal voice with your lips about one eighth of an inch away from the microphone. Do not shout. Shouting reduces intelligibility. The number of bars displayed will change as the operator talks.

TX LOW

THE TUNED INDICATOR

The display’s “TND” indicator shows that the SEA 1612 series, SEA 1635 or SEA 1631 antenna tuner has successfully matched the antenna to the radio for maximum radiated power. When the radio tuner mode is enabled, entering a frequency or channel will cause the “TND” i n dicator to ext inguish and the “LOW” indicator to appear. Speaking into the microphone when the PTT is pushed will allow the tuner to find a match. The “TND” indicator will be displayed and the “LOW” indicator will extinguish allo wing full output power.

If a frequency or channel has never been used, the “match” will take slightly

NOTE

longer.

TX LOW

TND

GENERAL OPERATIONS

DEMAND TUNE

When the tuner senses a high VSWR, it will attempt to match the antenna automatically during transmit. The Demand Tune function signals the tuner to undergo a complete tune cycle even with an acceptable VSWR. This may be needed on those rare occasions when the “TND” indicator does not appear or when the operator suspects the match could be better. For the Demand Tune function to operate, the SEA 1612C or SEA 1635 tuner must have the ‘DTN’ terminal connected to the SEA 235’s rear panel accessory connector P3 pin 10 (DMD TUNE). The ‘TUNER’ option in the radio’s “SETUP” menu must also be pro grammed to “TNR ON”. Better tunes may occur using Demand Tune.

To Demand Tune, key the radio by holding the PTT button on the microphone down, then press and release to start the tune cycle.

The “TND” indicator will turn off, the “LOW” indicator will turn on and the radio will show “TUNING”.

FNC

TX LOW

When the tuner has successfully completed the match, the “LOW” indicator will disappear as the “TND” indicator appears and the display will show the VSWR. Release the microphone PTT.

In the event that the tuner can not find a match in 15 seconds, the radio will stop transmitting and the display will read “NO TUNE”.

When tuning with voi ce, “HI VSWR” will occasionally be displayed until the tune cycle has successfully completed the antenna match.

NOISE BLANKER OPERATION

Use the key to toggle the noise blanker on / off. The “NB” indicator shows the noise bla nker is on. The noise blanker will help reduce impulse noise that may be caused by on board equipment such as a bilge pump or refrigerator compressor.

SEND

TND

TX LOW

NB TND

GENERAL OPERATIONS

SELECTING A VOICE CHANNEL

Enter the desired three or four digit ITU/SEA channel number followed by

ENT

e.g.

2182

3 ENT

The display will show the channel entered followed by the receive frequency for the selected channel.

Press to switch between the

CH FX

channel number display and the frequency display.

When the microphone PTT button is pressed, the transmit frequency will be displayed when in frequency display mode.

If the channel does not exist, “NO FREQ” is displayed.

SELECTING A TELEX CHANNEL

LOW

The SEA 235 is capable of telex operations when used with an appropriate modem.

Enter the desired three or four digit ITU/SEA telex channel number followed by

e.g.

2182

CH FX

The display will show the channel entered followed by the receive frequency for the selected channel.

Press to switch between the

CH FX

channel number display and the frequency display.

When the microphone PTT button is pressed, the transmit frequency will be displayed when in frequency display mode.

If the channel does not exist, “NO FREQ” is displayed.

TLX

LOW

TLX

LOW

SELECTING A CHANNEL BY BIN NUMBER

Enter the desired one, two or three digit bin number followed by

ENT

GENERAL OPERATIONS

e.g.

2 4 ENT

The display will show “BIN 24” for 1 second followed by the name tag of the bin selected.

Press to cycle between the channel

CH FX

display, frequency display, and alphanumeric name tag displays. When the microphone Push To Talk button is pressed, the transmit frequency will be displayed when in frequency display mode.

If the bin is not programmed, “NO FREQ” is displayed.

CHANGING THE DISPLAY VIEW

between the alphanumeric name tag, channel number and the associated frequency for that channel.

is used to change the display view

LOW

TND

For Bins, the key will change the

CH FX

display view between the Alphanumeric name tag, freq uency and bin number.

When is pressed while on 2182.0 KHz,

CH FX

the display will briefly show “EMER 0”.

To display the transmit frequency, press to have the display show the receive frequency. Press the microphone PTT to have the transmitter frequency displayed.

ALPHANUMERIC NAME TAG

TND

FREQUENCY VIEW

CH FX

TND

BIN / CHANNEL VIEW

GENERAL OPERATIONS

ENTERING A RECEIVE ONLY FREQUENCY

Enter any frequency using four, five, or six digits followed by “ENT”.

e.g.

2182

ENT1

If the frequency entered is less than 490.0 KHz or greater than 29999.99 KHz, the radio will prompt “ILLEGAL” and revert to the last channel entered.

When trying to transmit on a receive only frequency, the display will show “RX ONLY”.

will not operate in receive only mode.

SELECTING THE EMERGENCY CHANNEL

Press

2182

LOW

The radio will switch to the international emergency frequency of 2182.0 KHz using USB, J3E mode.

If H3E (AME) mode is required, press

FNC

repeatedly until “MODE” is displayed. Press then or

ENT

(“PRESS+-”) repeatedly until “AME” appears. Press

ENT

The radio is now ready to transmit an AME signal using a 40 W carrier.

Pressing the will briefly show the

CH FX

assigned channel number, “EMER 0”.

LOW

AME

LOW

AME

LOW

GENERAL OPERATIONS

SENDING THE DISTRESS ALARM SIGNAL

Press to stop any entry in progress.

Press to select 2182.0 KHz.

If H3E (AME) mode is required, press

ENT

2182

FNC

repeatedly until “MODE” is displayed.

Press then the or key

ENT

repeatedly until “AME” appears. Press to select AME mode .

ENT

AME is only available on 2182.0 KHz.

LOW

To transmit the alarm signal, hold the key down then press

SEND

ALRM

The radio will transmit the alarm for 45 seconds unless stopped by pressing

ALRM

The two tone alarm signal can be transmitted on all available frequencies. It is not necessary to use 2182.0 KHz for the alarm generator to function.

To test the alarm without transmitting a signal, press

ALRM

You will hear the alarm tones through the speaker but no signal will be transmitted. This will continue for 45 seconds unless stopped by again pressing

ALRM

LOW

TND

LOW

AME

GENERAL OPERATIONS

OVERRIDE

When operating conditions are outside the normal 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

6 FNC6

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. If the power has been reduced manually or the tuner fails to match the antenna, the override will not increase to full power.

SQUELCH OPERATION

Use the key to toggle the squelch

SQL

on / off. The “SQL” indicator shows the squelch is on. The speaker will mute after approximately 2 seconds. Varying audio frequencies will open the squelch but not a steady tone.

CLARIFIER OPERATIONS

In the “MARINE” operating system, the clarifier tuning range is limited to ±200 Hz when used on any Bin or ITU/SEA channel. When the radio is turned on, the clarifier step size will default to 10 Hz.

Any “receive only” frequency or any frequency used in the “AMATEUR” operating system has an unlimited clarifier range and can be changed in steps of 10 Hz, 100 Hz, 1 KHz, or 10 KHz.

TND

SQL

TND

SQL

Flashing clarifier set for 10 Hz (default)

To change the clarifier resolution

Select “1” for 10 Hz steps, “2” for 100 Hz steps, “3” for 1 KHz steps or “4” for 10 KHz steps then “UP” or “DN”.

e.g. Press or to have the clarifier change in 100 Hz steps.

The chosen clarifier digit will blink for 2 seconds to indicate the selection. If the digit does not blink, it is not a valid selection for the current mode and the setting will not change .

LOW SQL

Flashing clarifier set for 10 KHz

OPERATING THE MEMORY BROWSE

Browse enables a manual scan of all channels or bins programmed in the radio.

Press then or

GENERAL OPERATIONS

LOW

Pressing will change the channel to the

Starting at ITU channel 403

next channel in memory. The display will then change to frequency mode when an ITU/SEA channel is selected.

Pressing will change the channel to the

previous channel in memory. The display will then change to frequency mode when an

Next ITU channel in memory is 404

LOW

ITU/SEA channel is selected.

will toggle between bin/channel,

frequency and name tag display modes.

Memory browse will not scan through bins and channels at the same time. If a channel is selected and you wish to browse the bins, select

Previous ITU channel in memory is 402

LOW

a bin number fr om which to start.

When the last bin or channel is selected, the next step will go to the beginning of the bin or channel list.

To exit memory browse, press the microphone Push To Talk button briefly, adjust the clarifier step size or recycle the radio power.

ADVANCED OPERATIONS

SELECTING THE PROGRAM MENU

To enter the program mode press

The display will show “PROGRAM”, followed by the first program option. Every time the

FNC

option. The options available for programming are “STORE”, “ERASE”, “ALPHA” and “EXIT”.

1 FNC

key is pressed, the radio will step to the next programming menu

“

STORE

” will allow saving either the displayed information or entering a new transmit / receive frequency pair and operating mode. If a name tag other than the suggested is used (other than “NEW”), a new scan cell will be created.

“

ERASE

“

ALPHA

” deletes the bin number entered. Erasing a bin will split a scan cell.

” is the name tag edit routine. This routine is also used when storing a

display or new frequency pair. “

EXIT

” will exit the program menu. No channel or frequency information will

be stored when EXIT is selected.

Care should be given to the bin number used when programming frequencies.

NOTE

The bin number and name tag will affect how channels are browsed and scanned.

ADVANCED OPERATIONS

PROGRAM MENU SELECTIONS

Key Chart 1 - PROGRAM MENU 1

ADVANCED OPERATIONS

PROGRAM MENU SELECTIONS

(cont.)

Key Chart 2 - PROGRAM MENU 2

ADVANCED OPERATIONS

STORING THE DISPLAYED FREQUENCY

After selecting a channel or commonly used frequency, the displayed information may be saved into any bin location. This will include the mode of operation such as LSB, receive only, etc. To save the displayed information, press to enter the program mode.

1 FNC

Press when “STORE” appears on the

ENT

display.

You will be prompted to “PRESS+-” for selecting the type of information to store.

Press or then when

ENT

“DISPLAY” appears.

Enter any bin number for storing the displ ayed frequency fo llowed by

ENT

e.g. To save the displayed information to bin

number 171 press:

ENT

If the bin is “FULL”, you may overwrite the information by pressing or press

ENT

to select a new bin. Pressing

2182

will exit the programming mode.

Because bin 170 is factory programmed as “ALSKA16”, the radio will make the assumption that the operator will want this channel’s name tag to be ALSKA17.

The character that is ready to edit will blink. If you wish to leave the character the same press . P r ess or to change

ENT

the blinking character. Press to move to the next character .

ENT

Blinking character may be changed

ADVANCED OPERATIONS

STORING THE DISPLAYED FREQUENCY

After accepting or editing the name tag, the operator is again prompted to “PRESS+-”.

Pressing or will cycle through the

final options of “SAVE”, “EDIT” and “EXIT”.

Pressing when “

ENT

will save the information to the bin number chosen.

“

EDIT

” allows the name tag to be changed or

corrected for the selected bin.

“

EXIT

” will leave the program mode without saving the information to the selected bin unless “SAVE” is selected before “EXIT”.

After saving the information, “BIN 171”, followed by “STORED” will appear indicating that the information has been saved.

SAVE

” is displayed

(cont.)

The radio will stay in the program mode asking if the operator wishes to “STORE” another channel.

To exit the program mode, press the key to have “EX IT” appear then to

FNC

ENT

restore the radio to normal operations.

ADVANCED OPERATIONS

PROGRAMMING A NEW FREQUENCY

The SEA 235 allows the operator to store a new frequency pair that is not the current displayed frequency. This is useful when more than one bin location is to be programmed while in program mode. This will include the mode of operation such as LSB, receive only, etc. To save a new frequency pair to a bin location, press to enter the program mode.

1 FNC

Press when “STORE” appears on the

ENT

display.

You will be prompted to “PRESS+-” for selecting the type of information to store.

Press or then when

ENT

“NEW” appears.

Enter the bin number for storing the new frequency fo llowed by

ENT

e.g. To save the displayed information to bin

number 171 press:

ENT

If the bin is “FULL”, you may overwrite the information by pressing or press

ENT

to select a new bin. Pressing

2182

will exit the programming mode.

When “RX FREQ” is displayed, enter a receive frequency.

If the receive frequency is not between 490.0 KHz and 29999.9 KHz, “ILLEGAL” will be displayed.

ADVANCED OPERATIONS

PROGRAMMING A NEW FREQUENCY

Enter the transmit frequency at the “TX FREQ” prompt. If a receive only channel is needed, press at the “TX FREQ” prompt. The transmit frequency must be between 1600.0 KHz and 29999.9 KHz.

The choices for the “MODE” prompt can be selected by pressing the or keys.

The available modes are “USB”, “LSB”, “TELEX”, “TLX - GW”, “TLX - PD”, “AME”, “CW” and “TRUE AM”.

When the required mode of operation is displayed press Normally, all marine communications are USB or TELEX.

2182

ENT

(cont.)

Because bin 170 is factory programmed as “ALSKA16”, the radio will make the assumption that the operator will want this channel’s name tag to be ALSKA17.

The character that is ready to edit will blink. If you wish to leave the character the same press . P r ess or to change

ENT

the blinking character. Press to move to the next character.

ENT

After accepting or editing the name tag, the operator is again prompted to “PRESS+-”.

Blinking character may be changed

ADVANCED OPERATIONS

PROGRAMMING A NEW FREQUENCY

Pressing or will cycle through the

final options of “SAVE”, “EDIT” and “EXIT”.

Pressing when “

ENT

will save the information to the bin number already entered.

“

EDIT

” allows the name tag to be changed or corrected for the selected bin.

“

EXIT

” will leave the program mode without saving the information to the selected bin unless “SAVE” is selected before “EXIT”.

“BIN 171” “STORED” will appear indicating that the information has been saved.

SAVE

” is displayed

(cont.)

The radio will stay in the program mode asking if the operator wishes to STORE another channel.

To exit the program mode, press the key to have “EX IT” appear then to

FNC

ENT

restore the radio to normal operations.

ADVANCED OPERATIONS

ERASING A CHANNEL

Any frequency pair located in scratchpad memory may be erased. To erase a frequency pair in a bin location, press to enter program mode.

When “STORE” appears on the display, press the . key until “ERASE” appears.

FNC

1 FNC

Press at the “ERASE” display.

Enter the b in number of the c hannel you wish to erase followed by

e.g. To erase bin number 171 press:

The display will show “ERASED” and return to the beginning of the program mode.

To exit the program mode, press the key to have “EX IT” appear then to restore the radio to normal operations.

ENT

ENT11 7

FNC

ENT

ADVANCED OPERATIONS

CHANGING THE NAME TAG OF A BIN

The name tag given to a bin locatio n may be changed at any time. To rename a bin location, press to enter program mode.

When “STORE” appears on the display, press the . key until “ALPHA” appears.

FNC

1 FNC

Press at the “ALPHA” display.

ENT

Enter the bin number that is needed to be renamed followed by . Bins 196 to

ENT

200 are assigned to “NECODE” and can not be renamed.

e.g. To rename bin number 2 (W WV 2) to show it is the 5 MHz WWV frequency press:

ENT

The name tag for the selected channel will appear with the first character blinking. If you wish to leave the character the same press . P r ess or to change

ENT

the blinking character. Press to move to the next character.

ENT

The “*” character indicates a space.

Blinking character may be changed

After the final character is entered, the display will show “BIN 2” “STORED” and return to the beginning of the program mode.

Care should be given when renaming bins.

NOTE

When a bin in a scan cell (bins that share the same first three characters in their name tag) is renamed, the group will be split. 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.

ADVANCED OPERATIONS

SCANNING A CHANNEL GROUP

Consecutive bin locations 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. To scan a group of channels, first select a bin within a scan cell.

e.g. To scan the KMI marine operator channels programmed in bin locations 13 through 30, select any bin between 13 and 30 followed by “ENT”.

Press

After the name is shown for the selected bin, press to start the scan.

Press repeatedly until “ displayed then press

The radio will turn on the “SQL” indicator and begin the sca n of bins 13 through 30. The first time through the scan cell, each bin is sampled for approximately 7 seconds. When the last bin in the scan cell has been sampled, the scan speed will increase to 1 bin every ¼ second. When an audio signal is received, the radio will open the squelch and stay on channel for as long as the signal is present and changing.

When “ received, the radio will stay on the channel for a maximum of 5 seconds and continue to the next bin even if the signal is still present. This is a good selection when scanning active channels.

1 3

2 FNC

FNC

PAUSE

” scan is selected and a signal is

ENT

VOICE

” is

LOW SQL

“

TELEX

time is required to determine when a valid signal is present.

“

NECODE

special scan mode looks for a 2 KHz tone indicating a possible Necode signal. The scan speed is increased to approximately 5 channels every ½ second.

” scan reduces the speed to 1 channel every 4 seconds. The additional

” scan is for scanning the Necode bins, 196 through 200. This

ADVANCED OPERATIONS

DIRECT FREQUENCY

When a frequency is entered into the radio, it is a receive only frequency. The ‘Direct Frequency’ function allows the operator to input transmit and receive frequencies along with a mode of operation.

To enter a transmit frequency using the direct frequency function press

Enter the receive frequency at the “RX FREQ” prompt followed by . This frequency

ENT

must be in the range of 490.0 KHz to 29999.9 KHz.

At the “TX FREQ” prompt, enter the transmit frequency followed by . If both the transmit and receive frequency are the same you can press . If the frequency being

ENT

entered is receive only, press The transmit frequency must be in the range of

1600.0 KHz and 29999.9 KHz.

3 FNC

ENT

2182

After entering the transmit frequency, you will need to select the “MODE” of operation. Press the or key at the “PRESS+-” prompt.

Press the key when the required mode

ENT

is displayed.

Under normal operations, USB is used for all marine communicatio ns.

If the frequency entered (transmit or receive) is outside the radio’s specified range, the display will show “ILLEGAL” and return to normal radio operations.

+ 74 hidden pages

SEA 235 Operator's Manual

Specifications and Main Features

Frequently Asked Questions

User Manual