DRAKE SPR-4 Spezifikationen PDF herunterladen (Seite 31)

pins

Late SPR-4’s have a 12

1/2

watt resistor between T-6 and the

pre-

mixer

board

Cut the resistor

lead

from T-6 and remove the resistor. Route

the coax

cable

along

the wiring harness and install the phono fitting on the

end of the

cable

in the large hole near the

center

of rear

chassis

apron

shown in Figure 17

The nut and the flat washer should be on the

outside

of the

chassis

Remove the SPR-4

S-meter

lamp

bracket by squeezing the

sides

of the

bracket.

Remove the lamp bracket from the crystal selector frame by

removing the mounting screw.Locate the audio transformer mounting

feet

over

the two

holes

in the top of the

chassis

which are in front of the

crystal selector.

The black transformer lead should be

facing

the front

panel

Mount the audio transformer by inserting number six screws

through the

chassis

holes

from the bottom and into the speed nuts on the

transformer.

Route the two transformer leads through the rectangular

chassis

hole..

Push the pin on the black wire into the clip on the

head-

phone

jack.

Some early SPR-4 Receivers do not have this clip. In this

case, solder the black wire to the headphone terminal

closest

to the RF

and audio gain

controls

Route the red wire along the wiring harness to

the rear of the

chassis

and mount the phono fitting in the

3/8

inch

hole

directly below the speaker

jack..

Some early SPR-4 Receivers

may

have a

1/4

inch hole in this location.

In this case,

enlarge

the

1/4

inch

hole

3/8

inch..

Replace both lamp

brackets

will

be necessary to adjust the injection trimmers after the TA-4 instal-

lation .

See “5.3,

Paragraph

3” for the required

accessory

crystals for

tuning the injection trimmers .

Tune

in the signals in the chart below

from a signal generator or the crystal calibrator and peak

the preselector for maximum

S-meter

reading. Detune T6 by grasping a

metal screwdriver shaft and touching it to the rotor contact of

S4R

and

tune

the rear most injection trimmer for the band under alignment for max-

imum AVC deflection or

S-meter

reading .

Detune

by touching the

rotor contact of S8F and

tune

the front injection trimmer for maximum AVC

deflection or

S-meter

reading.

BAND

FREQUENCY IN MHz

28.7

MHz

21.5

14 .o

6.0

3.8

1.9

1.6

6.4.3 OPERATION

The TA-4 is activated by circuits in the Drake T-4/T-4B/T-4X/T-4XB

Transmitters ,

therefore operation of the TA-4 is performed at the

trans-

ceive

switch on these transmitters .

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 65 66

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