Yaesu FC-902 Manuale utente

INSTRUCTION

MANUAL

FC-902

YAESU

MUSEN

CO.,

LTD.

TOKYO,

JAPAN

THE

FC-902

ANTENNA

COUPLER

The

FC-902

antenna

coupler

designed

for

low

and

medium

power

applications

the

amateur

bands

from

160

through

meters.

It is

designed

minimize

the

adverse

effects

high

SWR

coaxial

line

wire

antenna

which

may

result

difficulty

tuning

transmitter

designed

work

into

resistive

ohm

load.

The

FC-902

comes

equipped

with

three

UHF-type

female

coax

receptacles,

and

threaded terminal

single-wire

antenna.

The

front

panel

controls

include

bandswitch

for

selecting

proper

impedance

values

for

matching,

TUNE

and

LOAD

controls

for

adjustment

the

capacitive

coupling,

and

POWER

SWR

switch

for

setting

the

meter

sensitivity

for

the

power

being

used.

The

ANT

SELECT

switch

chooses

among

any

four

antennas

matched,

and

desired

feed

antenna

directly

through

the

coupler

the

trans-

mitter

without

any

matching

done

the

coupler,

position

the

BAND

switch

will

accomplish

this.

High-quality

low-loss

components

are

used

throughout

the

FC-902

antenna

coupler,

and-the

matching

function

performs

means

your

transmitter

will

always

''see"'

the

resistive

termination

was

designed

for.

The

inherent

selectivity

the

FC-902

matching

circuitry

helps

attenuate

harmonics,

too,

thus

reducing

harmonic-related

TVI

out-of-band

emission,

FC-902

SPECIFICATIONS

FREQUENCY

COVERAGE

Input

impedance

Max.

variation

load

impedance

Maximum

transmitter

power

Power

meter

calibration

scales

Insertion

loss

Rear

panel

antenna

connections

Dimensions

Weight

SWR

calibration

160mL

1.8-2.0

MHz

160mH

1.9-2.4

MHz

80m

3.5

-4.0

MHz

40m

7.0-7.5

MHz

30m

10.0-10.5

MHz

20m,

14,0-14.5

MHz

lim

18.0-18.5

MHz

15m

21.0-21.5

MHz

12m

24.5-25.0

MHz

10m

28.0-29.7

MHz

50-75

ohms

ohm

in:

10-250

ohms

ohm

in:

18-300

ohms

500

PEP

ohms

250

500

0,5

max.

coaxial

"UHF"

type

single

wire

terminal

208

(L.)x152(H)x324(D)

mm.

6.5

kg.

4:1SWR

FRONT PANEL

CONTROLS

TUNE

The

TUNE

control

dual

capacitor

provide

capacitive

adjustment

the

coupling

between

the

transmitter

and

the

impedance

established

the

BAND

switch

and

the

LOAD

control,

The

TUNE

and

LOAD

controls

are

adjusted

for

minimum

SWR.

BAND

switch

The

BAND

switch

selects

the

inductance

required

accomplish

matching

the

band

question,

The

operator

should select

the

BAND

switch

position

which

best

covers

the

portion

the

band

being

used,

The

DIREGT

position

the

BAND

switch

connects

the

transmitter

directly

the

antenna,

bypassing

the

FC-902

matching

circuitry,

but

permitting

measurement

the

SWR

the

line

that

point.

SWR

SET

This

control

used

calibrate

the

SWR

METER:

the

SWR

may

read

accurately

adjusting

the

SWR

SET

control

for

full

deflection

the

FWD

POWER

meter

with

the

POWER

SWR

switch

the

SWR

SET

position.

LOAD

The

LOAD

control

connected

variable

capacitor

which

adjusts

the

coupling

between

the

antenna

feedline

and

the

impedance

presented

the

BAND

switch

inductor

and

the

TUNE

control.

ANT

SELECT

This

switch

selects

the

antenna

matched.

The

operator

has

the

choice

one

three

coax-fed

antennas

single

wire

antenna.

POWER

&SWR

switch

This

switch

used

select

the

proper

sensitivity

the

FWD

POWER

raeter

for the

power

being

used,

and

provide

calibration

for

the

measurement

SWR,

FWD

POWER

meter

The

FWD

POWER

meter

reads

the

output

power

three

scales

watts,

250

watts,

and

500

watts

maximum.

SWR

meter

When

calibrated,

this

meter

provides

accurate

measurement

SWR

for

purposes

adjusting

the

LOAD

and

TUNE

controls

for

the

best

match,

COUPLER

UNIT

2500)

(500)

REAR

PANEL

CONNECTIONS

ANT

These

three

female

UHF

-type

connectors

will

the

coaxial

feedline

from

the

antenna.

well,

dummy

load

such

the

YAESU

YP-150

may

attached

one

these

connectors

for

tuning

test

purposes.

WIRE

This

threaded

terminal

accepts

single-wire

antenna

such

the

"Windom"

type.

GND

This

terminal

should

connected

good

earth

ground

provide

path

ground

for

stray

currents,

and

reduce

“RF

the

shack"

and

ground

loops,

etc.,

that

may

make

antenna

matching

difficult.

This

particulary

important

the

case

certain

types

single-wire

antennas.

INPUT

The

INPUT

connector

another

female

UHF

receptacle

for

connection

between

the

FC-902

and

the

output

connector

the

transmitter

transceiver,

COAXIAL

CABLE

ord

HEED

TRANSCEIVER/

TRANSMITTER

YP-150

anta

anni]

“3

asta

witt/on>wyput

ant

10)

(9)

COAXIAL

CABLE

COAXIAL

CABLE

The

reader

referred

Fig.

which

contains

the

approximately

correct

positions

the

BAND,

LOAD,

and

TUNE

controls

for

ohm

load

impedance,

such

that

presented

dummy

load.

dummy

load

extremely

useful

for

tuning

transmitter

preparation

for

adjustment

matching

antenna.

the

control

positions

shown

Fig.

are

utilized

conjunction

with

ohm

dummy

load,

only

very

minor adjustments

the

TUNE

and

LOAD

controls

will

necessary

for

perfect

match.

course,

50-ohm

dummy

load

should

require

matching

for

perfect

match

50-chm

transmitter

output,

but

this

information

presented

because

the

control

positions

Fig.

represent

useful

starting

points

for

matching

unknown

impedances.

‘The

following,

then,

step-by-step

procedure

for

the

matching

antenna

feedline

that

has

not

been

matched

previously.

Tune

the

transmitter

the

normal

way

into

50-ohm

dummy

load

(if

ohm

coax

used

between

the

transmitter

and

the

FC-902)

other

resistive

ohm

termination.

Reduce

the

gain

control

the

transmitter

minimum,

and

place

the

transmitter

"standby"

for

the

moment,

Place

the

BAND,

LOAD,

and

TUNE

controls

the

positions

indicated

Fig.

for the

frequency

which

the

line

matched.

Place

the

ANT

SELECT

switch

the

position

which

corresponds

the

rear

panel

connector

the

antenna

matched.

Place

the

POWER

SWR

switch

the

SWR

SET

position,

and

place

the

SWR

SET

knob

the

12:00

position.

desirable

make

preliminary

matching

adjustments

with

little

transmitter

output

power

possible.

Place

the

transmitter

the

"transmit"

condition,

and

slowly

advance

the

output

level

until

deflection

the

FWD

POWER

meter

observed.

Adjust

the

SWR

SET

control

line

the

meter

needle

the

FWD

POWER

meter

with

the

SWR

SET

position

the far

right

end

the

FWD

POWER

meter,

using

the

minimum

power

necessary

accomplish

this.

With

the

needle

the

SWR

SET

mark

the

FWD

POWER

meter,

the

SWR

meter

will

accurately

read

the

SWR.

Adjust

the

TUNE

control

for

minimum

reading

the

SWR

meter.

necessary,

adjust

the

SWR

SET

control

and/or

trans-

mitter

power

ensure

proper

calibration.

Once

the

"dip"

has

been

found

using

the

TUNE

control,

move

the

LOAD

control

either

the

left

right,

small

amount.

Adjust

the

TUNE

control

for

"dip"

again,

and

the

SWR

improves

(again,

make

sure

that

you

are

reasonably

well

calibrated)

move

the

LOAD

control

slight-

the

same

direction.

Again

"dip"

the

TUNE

control,

and

continue

this

procedure

until

further

improvement

noted.

the initial

direction

adjustment

the

LOAD

control

worsened

the

SWR,

move

equal

direction

from

the

starting

point

THE

OPPOSITE

DIRECTION

and

the

above

procedure

with

sive

adjustment

the

TUNE

and

LOAD

controls.

suce

———

Once

the

initial

procedure

has

been

followed

yield

near-

perfect

match,

the

POWER

SWR

switch

may

placed

the

position

which

most

closely

corresponds

the

transmitter

output

power

expected.

The

transmitter

may

then

adjusted

for

full

power

(some

adjustment

the

transmitter

load

and

tune

controls

may

necessary

during

matching

adjustments),

and

the

FC-902

LOAD

and

TUNE

controls

may

adjusted

yield

zero

deflection

the

SWR

meter.

When

the

POWER

SWR

switch

not

calibrated

with

the

SWR

SET

controls,

the

SWR

meter

will

not

accurately

read

the

SWR,

but

will

indicate

minimum

reflected

power.

NOTES

ANTENNA

MATCHING

very

important

that

the

maximum

time

limits

during

tune-up

conditions

for

the

transmitter

are

not

exceeded.

This

particularly

important

when

the

transmitter

being

used

at full

power.

should

noted

that

any

matching

performed

the

FC-902

the

shack

will

have

effect

the

losses

due

SWR

the

coaxial

line

between

the

FC-902

coupler

and

the

antenna,

The

operator

should

consult

one

the

popular

antenna

handbooks

determine

whether

not

matching

between

the

coaxial

line

and

the

antenna

must

performed

the

antenna.

For

exemple,

100-foot

length

RG8A/U

coax

typically

has

loss

(with

1:1

SWR

between

and

antenna)

less

than

MHz.

this line

operated

with

3:1

SWR

due

low

high

antenna

impedance,

the

loss

due

SWR

will

increase

roughly

0.5

dB,

imperceptible

degradation

compared

the

1:1

condition.

this

case,

attempts

reduce

the

3:1

SWR

the

antenna

end

would

serve

useful

purpose

far

reducing

losses

the

coax,

through

matching

with

the

FC-902

would

improve

the

ance

presented

the

transmitter

output

cirenitry.

However

500-foot

length

the

above

cvax

were

used

instead

only

100

feet,

somewhat

than

1dB

loss

would

occur

the

coax

due

the

3:1

SW,

possibly

justifying

further

matching

attempts

the

anteara,

Whea

using

transceiver

such

the

FT-301D

which

has

protection

for the

output

transistors

against

high

SWR,

can

seen

that

the

matching

action

the

FC-902

will

ensure

that

ohm

load

presented

the

output

circuitry,

thus

ensuring

full

transmitter

power.

may

useful

for

the

operator

record

notebook

the

proper

TUNE

and

LOAD

positions

for

particular

anteana

for

qaick

fabricate

reace,

Alternatively,

apptopriate

labels

may

and

applied

the

FC-902

front

panel

showing

the

tions

the

TUNE

and

LOAD

controls.

proper

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