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CHAPTER Ill

OPERATION

3-1.

FRONT

PANEL

CONTROLS.

(Figure

1-1)

VSWR

SET

Control:

Varies

the

sensitivity

of

the

VSWR

sensing

circuitry.

Meter:

Displays

either

forward

power

in

watts

or

VSWR

as

selcted

by

meter

switches.

VSWR

SET

Switch:

Used

to

calibrate

the

meter

for

VSWR

measure

ments.

VSWR

READ

Switch:

Causes

meter

to

indicate

VSWR.

200

and

2000

Watt

Switches:

Causes

meter

to

indicate

forward

power,

either

200

or

2000

watts

full

scale.

ANTENNA

Switch:

Selects

the

desired

antenna

and

grounds

all

unused

antenna

terminals.

Positions

are

provid-

ed

for

Dummy

Load

(which

can

also

be

used

for

an

additional

antenna

or

as

a

grounding

posi-

tion

for

antennas

1

through

4),

2

coaxial-fed

antennas

(1,2)

and

two

long-wire

antennas

(3,4

without

accessory

balun).

With

accessory

B-1000

balun,

balanced

feedline

capability

or

1:l

and

41

match

to

long-wire

antennas

are

available.

BAND

Switch:

Selects

the

fixed

capacitors

and

inductors

for

each

band.

In

the

DIRECT

position,

bypasses

the

matching

network

and

connects

the

RF

through

the

meter

circuitry

directly

to

the

antenna

selected.

REACTIVE

Tuning:

Tunes

out

the

series

reactive

component

of

the

antenna

impedance.

Reactive Range

Switch:

Switches

in

additional

fixed

capacity to

provide

additional reactive

tuning

range.

RESISTIVE

Tuning:

Varies

the

resistive

component

of

the

MN-2700

output

impedance

to

match

the

series

resistive

component

of

the

load.

Resistive

Range

Switch:

Switches

in

additional

fixed

capacity

to

provide

additional

resistive

tuning

range.

3.2

REAR

PANEL

CONNECTIONS.

(Figure

3-2)

XMTR

Jack:

50-239

socket

for

input

from

the

transmitter

DL

Jack:

50-239

socket

for

the

connection

of

a

dummy

load

(or

another

coaxial

fed

antenna).

ANT

1-and

ANT

2:

50-239

sockets

for

2

separate

coaxial

fed

antennas.

LW3

and

LW4:

Screw

terminals

for

two

longwire

antennas,

when

used

without

the

accessory

balun

(1:l

im-

pedance

ratio

to

matching

range

of

network).

Numbers

correspond

to

ANTENNA

selector

switch

position.

3.3.

USE

OF

THE

DRAKE

B.1000

ACCESSORY

BALUN

Installation:

Remove

the

three

screws

at

terminals

marked

LW3,

LW4,

NC

and

then

reinstall

these

screws

through

the

holes

in

the

balun

board

to

the

matching

terminals

on

the

MN-2700.

Also,

in-

stall

the

two

mounting

screws

in

the

other

two

corners

of

the

balun

board

to

the

MN-2700.

Balanced

Feedlines:

The

two

wires

of

the

balanced

feeders

are

con-

nected

on

the

top

of

the

balun

board,

under

the

heads

of

terminal

screws

marked

BAL

and

BALlLW(1:l

or

4:l).

The

ANTENNA

selector

switch

is

placed

in

position

3

when

this

antenna

system

is

used.

Long-Wire

Antenna

Using

Balun:

(Cannot

be

used

when

balanced

feeders

are

at-

tached.)

Connect

the

longwire

to

the

terminal

marked

BALILW

(1:1

or

41).

In

ANTENNA

switch

position

3,

the

antenna

will

be

matched

with

a

1:l

impedance

ratio.

In

position

4,

the

antenna

will

be

matched

with

a

4:l

impedance

ratio,

providing

for

a

higher

impedance

range

matching

capability.

It

is

absolutely

necessary

to

have

a

good

RF

ground.

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