SEA 1612C Instructions for use

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AUNIT

OFDATAMARINE

INTERNATIONAL

NC.

sEA

1612C

r161

zVU

r161zWX

AUTOMATIC

ANTENNA

TUNER

INSTBUCTION

AND

MAINTENANCE

MANUAL

@Copyright

1993,1994

SEA Inc.

All rightsreseryed.

SEAInc.

70302201h

sr, s.w.

Mountlake

Terrace,

Washington

98049

(425) 771-?182*

FAX: (42s)771-2650

MAN-1612C

Revision

July2001 -G---

- - - r-

I r - --

- * - --

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* p -- r -

--I-!5t

IMPORTANT

NOTICE

TOINSTALLERS

The 1ffi2D is designed

to be weatherproof

whenproperly

installed.Be sure

allfasteners

aretight

andcable

entries

sealed. No warranty

claims

willbe allowed

for water

damage

to the contents.

2.1

2.2

TABLE

OFCONTENTS

1.1

1.2

1.3

1.4

PAGE

GENERAL

INFORMATION... .....1

. 1

Overall Description

............ .......-.......1

Electrical

Configuration ..-.............1

-2

Mechanical

Configuration ...............1-2

Weather

Housing

.1..;1...........| ..............1

-4

SPECIFICATIONSAND PARTSFURNISHED........,.....,....2.1

Specif

ications............ ......2-

Parts Furnished............... .2-2

PR|NC|PLEOF OPERAT!ON...-... .......,....3

- 1

Networks........... ..................3

Schematic

Diagrams ......3

AutoTuneOperation ...........3

-1

Vswr Detector ..................3

FrequencyCounter... ............3

PhaseDetector .................3

TheControl

Computer............... ............3

Initialization

And Fireup ...............3

-4

lnformation

Flead .............3

Information

Write...... ,.....3

TheProgr:am.............. .............3

INSTALLATION

PFOCEDURE ....4.

Mechanicat

Considerations..... .............4

-1

Electrical

Conslderations.,-...... .........-.4

-2

Electrical

Checkout.............. ............4

TROUBLESHOOTING....... ....--.-..-5

- 1

COUPLER

WILL

NOT

TUNE

. NOREI-AY

ACTION .-.........5

-1

RELAYS

OPERATE

BUTNO

TUNE ....5

-2

C,OUPLER

TUNES

BUT

NOMEMORY ..5

-3

TUNEB

WILL

NOTDEMAND

ruNE............... .....,,5.3

SCHEMATIC

AND CIRCUIT

BOARD

LAYOUT

SEA 1612CCOMPONENT

PARTSLIST

3.1

3.2

3.3

3.4

3.5

3.6

3,7

3.8

3.9

3.10

3.11

4.1

4.2

4.3

5.1

5.2

5.3

5.4

LISTOF

FIGURES

FIG.

# FIGURE

MME

1.3 Outlineand

Mounting

Dimensions.-...

3.1 Network

Configurations .....,.....3-2

6,1 Antenna

TunerSchematic

(ASY-1616-01)

6.2 Circuit

BoardLayout

1.1

GENEHAL

INFORMATION

OVERALLDESCRIPTION

The SEA 1612C is a fully automatic

antenna

tuning unit,

designedfor the MF-HFspectrum

and compatible

with a wide

variety of antenna systems. This product features an

advanced microprocessor-based

tuning algorithrn which

allows it to tune up on normal voice signals from the

associated transmitter

and also includes a "learning"

algorithm

which allows the controlcomputerto remember

which network

constants

are required

for a given operating

frequency. The memoryfeature

permits

the antennatuner,

once the "learning"

operation

is completed,to retune

a given

frequencyin approximately

20 milliseconds. This is less

than the time required

to say "hello". Antenna tuner

operation

is completely

automatic

and requiresno operator

intervention. lf the antennasystem

is altered

or replaced,

the tuner will automatically

"relearn"

the requirednetworks.

During the learning

period,

operation

is somewhat

slower

and, depending on the particular frequency/antenna

combination,

up to 5 seconds

may be requiredto achieve

matched

condition. When the antenna

has been properly

malched,

the tunersignalsthiscondition

by pulling

a control

line low. The controlsignalmay be used to operate

an "all

tuned" indicator

at the operators'

T-Fl position. Such an

indicator

is provided

in the SEA 222, SEA 322 and SEA 225

radiotelephones.

TheSEA1612C

alsoincludes

a "DEMAND

TUNE"function

and

'TUNE

LOCKOUT"

capability.

The "DEMAND

TUNE"

function

allowsthe user to forcethe

antenna tuner to retune on demand. This permits

"overwriting"

previously

stored tuneup information

when

desired.

The'TUNE LOCKOUT"

feature

is useful

when

two or more

transmitters

are co-located,

or when it is desirable

inhibitthe

AUTO

TUNE

function

foranyreason.

1-1

E.G.:when twoantennas

arein close

proximity,

it is possible

thattransmitting

on oneantenna

may

cause

considerable

to be coupled

into

theadjacent

antenna.

This

can

cause

the

tuner

to reset,

disturbing

the operation

of the radiotelephone.

such

cases,

the

"TUNE

LocKour'' feature

ofthesEA 1612c

can

be used

to prevent

the

SEA

1612C

from

entering

thetune

mode until the radiotelephone

it is associated

with is

actually

transmitting.

,2 ELECTRICAL

CONFIGURATION

The sEA 1612c matches

the compleximpedance

of the

antennasystem

to a nominal

50 ohms

by-'selecting."the:..,proper

network

from

a possible

combination

of 64 values

of input

32 values

of output

c and

s1z values

of series

L. Network

configuration

is automatically

determinedduring

the tune

cycleand may

be either

a Pl network

or either

of two types

of L network. wheneverpossible,

the L network

will be

selectedf

or maximum

eff

iciency. Tuneup is entirery

automatic

andmay

be accomplished

on voice

signals,

making

it unnecessary

to provide

a "low power

tune"modein the

trans

mitter.

1.3

Thevarious

RF sensors

in the SEA

function

down to power

levels

featuremakesthe SEA 1612C

equipment

such as the SEA 225

circuitry

to reduce

the output

power

hish

VSWR.

MECHANICAL

CON

FIGU

RATION

1612Caredesigned

10 to 20 watts. This

compatible

with radio

which is equippedwith

levelin the presence

All of the circultry

of the SEA 1612Cls contained

on printed

circuit

board PCB-1616-01. This printed

circuitboard is

mounted

on an aluminumshield

plate

with six 6-32 stainless

steelscrews. The shield

plate

is heldin the molded

weather

housingwlth four 10-24

stainlesssteel screws. (Figure

1.3

shows the outline

and mounting

dimensionsof the molded

weatherhousing.)

The printed circuit board is solder-masked

which helps to

prevent

corrosionand moisture

problems.

1-2

12.6"

A l,rt f D t 'ra.\ftt( tfIED{ IFN}L

6S8 @r{rtuNrc^TroNg

EIF| T'

16:1'

[+osmm]

lztzmm

f-11;" t2eemml--l

[

"*"]

SEA

1612C

ANTENHA

TUNER

OUTLINE

& MOUNTING

DIMENSIONS

FIGURE

1,3

1-3

1.4

Both the so-239 RF connector

and the six pin interface

connector

strip are mounted

on the printed

circuit board

itself. The interface

connector

acceptswire ends directly,

eliminating

any requirement

for special

lugsor lugging

tools.

A PL-259

type

FIF

plug

must

be fitted

to thecoaxiar

feedline.

WEATHER

HOUSING

The sEA 1612c

antenna

tuneris housed

in a weatherproof

molded case designed

to withstand

the environmental

conditions

encountered

aboard

ship when mounted

on the

weather

decks. The internal

constructionis designed

withstand

the shock and vibration of marine service.

corrosion-resistant

hardware

and passivated

alroys are

employed

throughout.

stufflng

glands

for the RFand Dc cablesare provided

on the

lower edge of the weather

housing,

along with a 1t4-ZO

stainless

steel

ground

stud. The antenna

connectsto the

ceramic

insulator

on thetopof theweather

housing.

I.5

SPECIAL

MODELS

OFTHE

16I2C

The

l6l2Cis

avaitable

thefollowing

two

optional

configurations:

thcl6lZW

and

thc

l6lZWX.

Thel6l2W isai6t2C

with

gas

filled

spark

gap

tubcinstalled

onrhe

printed

circuit

boardassembly.

This

part

willshuntexcessivcly

highvoltages

tothe

ground

plane(near

lightning

strikes)

toprevent

darnagetothcRFsensors.The

l612WX

al6l2W with

relay

assemblythat

shorts

the

antennaoutput

connector

ground

when

then

power

tothe

couplcr

switched

OFF.Pleasecontact

the

factory

foradditional

information.

1-4

2. SPECIFICATIONS

ANDPARTS

FURNISHED

2.1 SPECIFICATIONS

Frequency

Range 1.6to30.0MHz

RF Power

Capability 150wattsPeak

EnvelopePower

(PEP)

Input

lmpedance 50ohms

VSWR <2:1

PowerRequirements 13.6

VDC

negative

ground

OperatingCurrent 2 Ampsmax.

Tuning

Time "Learn

Mode",

typically

less

than5

seconds

"Educated

Mode",approximately

milliseconds

Recommended 23-75

ft. (7-23

meters)1.6-30

MHz

Antenna

Length I ft. (2.7

meters)whip3-30

MHz

Mounting Any position

EnvironmentalTemp.

Range -30"C

to +60oG

Size in:

15X12X

3.9

mm:

381

X304.8

X99

Weight 10 1bs./4.5

kgs.

CaseConstruction Molded

Weatherproof

Control

Cable No.

20Gauge,

3 to5 conductors,

shielded

(not

supplied)

2-1

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