DRAKE L7 Manual do Operador descarregar pdf (Página 19)

CHAPTER

OPERATION

CAUTION

DO NOT

turn on the L 7 Amplifier with the

cabinet removed because the high voltage

inter-lock shorts out the

B+ and will damage

Power Supply components.

DO NOT

operate

the Linear Amplifier until

has been

connected

a 50 Ohm antenna or a 50 Ohm

Dummy Load. Be sure that the correct jumper

connections described in Chapter 2 have

been made in both the Linear Amplifier and

the Power Supply for the line voltage to be

used.

3-1. GENERAL

Figure

3-1

identifies and describes all front panel

controls and indicators referred

in these tuning

and operating procedures. Perform the appro-

priate tuning procedures described below prior

operation.

For all modes of operation, the L 7is tuned up with

a single RF frequency driving

and

with

the

Mode switch in CW position. The exciter may be

tuned up on CW into the antenna

connected

the

amplifier by depressing the

STBY switch. The

exciter should be checked

be sure that

itis

tuned

up when driving the L 7 since the antenna

wn-

nected

the amplser may not be exactly 50

Ohms.

3-2. TUNING PROCEDURE

After the exciter has been tuned up,

turn

the

exciter to standby andrelease

theSTBY switch on

the

Set the Mode switch (red rocker switch)

CW position. The light that indicates high plate

voltage for SSB operation should be off, and the

OPR light should be on.

The Drake TR

and some other exciters utilize

transmitting AGC, sometimes called

ALC, during

all modes of operation. During tune up, transmit-

ting AGC will have

be defeated either by un-

plugging the transmitting AGC

connector, or by

turning the AGC control fully counterclockwise.

All Drake Transmitters and Transceivers except

the TR

and

2NT

(which has no transmitting

AGC) switch off AGC in

TUNE,

CW and

modes. It is not necessary

defeat AGC exter-

nally on Drake Transmitters, other than

theTR-7.

3-3. CW AND RTTY TUNING

Preset the front panel controls on the L

follows:

a. Mode switch

CW.

b. Band switch

desired band.

c. Meter switch to

3000

WAm

FWD.

d. STBY switch

"operate" (out).

LOAD

fully counterclockwise

zero.

f. PLATE wntrol in the arc provided for the

desired band.

Turn

AGC control fully counterclockwise.

h. ON-OFF switch

ON.

Turn on the exciter and increase the exciter output

while not exceeding

0.400 Amperes plate current.

Tune the

PLATE

control for a dip in plate current.

Alternately adjust the

LOAD

and PLATE controls

while

increasing

the exciter power in small incre-

ments until maximum

output occurs at 0.565

plate Amperes. Because of variations in line vol-

tage

graph (figure

3-2)

supplied which corre-

lates plate voltage and plate current for

1000

Watts DC plate input power and should

used

be sure that the amplifier

operating at or under

the maximum legal input power.

case maxi-

mum legal input cannot be obtained because of

low exciter power, tune for maximum forward

Watts at maximum exciter power.

3-4.

SSB

AND AM TUNING

Preset the front panel controls on the L7 as

follows:

a. Mode switch

CW.

b. Band switch

desired band.

c. Meter switch to IG (grid current).

d. LOAD control fully counterclockwise

zero.

Plate wntrol in the arc provided for the desired

band.

Turn AGC control fully counterclockwise.

STBY switch

"operate" (out).

h. ON-OFF switch

ON.

NOTE

Substitute

250

grid current for 200

succeeding

test

'Amperex 8802/%500Z

tubes are installed in the amplifier.

Turn on the exciter and increase the exciter output

while not exceeding

0.400

Amperes plate current

and tune the PLATE control for a dip in plate cur-

rent. While increasing the exciter power, maintain

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