DRAKE SPR-4 Spezifikationen PDF herunterladen (Seite 23)

minal on the R.F. amplifier board at the left top corner, looking into

the bottom of the SPR-4 and front pane1

facing

you.

This terminal

has coax

connected

Care should be taken not to short this

point to ground because Q4

will

ruined,

2. Preset the balance pot on the 1st mixer board fully clockwise.

Set the signal generator to 5645 kHz and adjust its level for a slight

AVC deflection.

4. Place the mode switch in LSB and adjust C 115, the outer trimmer

capacitor on the mixer oscillator board

for

zero beat .

Place the mode

switch

in USB and adjust C 113, the inner trimmer

capacitor on the mixer oscillator board for zero

beat.

Set the signal generator to 5650 kHz, the mode switch to LSB and

adjust T8 and then

for maximum AVC.

7. Set the generator to 5645 kHz and adjust the mixer balance pot for

minimum AVC deflection (most positive going ).

PRESELECTOR AND INJECTION ALIGNMENT

The settings of’the range,preselector,

crystal

selector, and PTO will

be indicated before

each

adjustment. Set the audio gain at 12

o’clock, the RF gain fully clockwise, mode switch to LSB, notch to

OFF, and accessory switch to

NORM .

Install the accessory crystals listed at 5.3.3 on Page 19. Plug the

47 ohm resistor into the antenna

jack,

J2.

Tum the preselector control fully clockwise and

check

the shield

cans

marked Tl ,

T2,

T3,

T4,

T5, and T6 for proper slug engagement.

The distance from the

top of the slugs to the top of the white coil

forms should be

9/16”

T2 and T4

may

differ from this figure by

1/32”

on receivers from the factory.

These s lugs

may

be left alone for

“Touch

up”

alignment .

For

complete alignment, set

all

slugs to

9/16”..

Turn the preselector control fully counterclockwise and set

the pointer on zero.

Tune

in the calibrator signal or an unmodulated signal generator

loosely coupled to the 47 ohm antenna load at 30.0 MHz (range

switch on

with 40.5 9 MHz

crystal, dial

on 500.

)

Rough tune

all

H band trimmers for maximum

S-meter

reading

and/or

maximum AVC

deflection.

Tune

in the calibrator or a signal generator at 28.7 MHz and repeak

the preselector for maximum AVC deflection .

Tune

the H band R .F .

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