DRAKE L7 Manual del operador descargar pdf (Pagina 9)

1-1.

GENERAL DESCRIPTION

TheR

L.

Drake Model L

7

Linear Amplifier offers

con.tinuoas 2000 Watts PEP on SSB, and 1000

Watts

DC

on CW,

AM

(controlled carrier) and

RTFY

operation covering the ham bands 160

through

15

meters. Non-amateur frequencies

between

1.8

and

21.5

MHz

may be covered with

mdi5cation of the input circuit.

The

L7

uses

2

zero-bias triodes in a Class

B

gmunded-grid circuit configuration that utilizes

RF

negative feedback for lower odd-order distor-

tion products.

As

shipped from the factory, these

tubes

will

be

one of the following listed parts,

which

are interchangeable but which are fur-

nished

in

pairs only:

Amperex 8802/3

-

5002

Amperex

8163

Eimae

3

-

4002

Eimac 3

-

5002

The

tnbes

are cooled by a quiet, dual-speed inter-

nal

&we.

A

transmitting AGC circuit controls the exciter

gain

to

allow the highest average power without

peak

clipping. Aninternal changeover relay feeds

CHAPTER

1

INTRODUCTION

the antenna through when theL

7

is

turned off. A

pair of relay

contacts bias the output tubes

to

cut-

off, eliminating unwanted

heat

and diode noise

when receiving. Twometers indicate plate

current,

grid current, plate voltage,

RF

output power, and

RF reflected power. The separate solid state Power

Supply requires no warm-up

period

and provides

excellent dynamic and static

vol-e regulation.

1-2.

MANUAL COVERAGE

This manual

is

presented

in

5

chapters with sup-

porting illustrations and is arranged for the con-

venience of the operator and

service

technician as

follows:

Chapter

1

Introduction (self explanatory).

Chapter

2

Installation. Describes the procedure8

to

be followed prior

to

operation.

Chapter

3

Operation. Illustrates and describes

front panel controls and describes

tune-up and operation

in

SSB, CW,

RTTY, TUNE and

AM

modes.

Chapter

4

Theory of Operation. Describes all

critical circuits and networks.

Chapter

5

Maintenance. Provides maintenance

instructions, troubleshooting and

parts ordering information.

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