DRAKE SPR-4 Spezifikationen PDF herunterladen (Seite 24)

and mixer trimmers for maximum AVC deflection. Detune T6 by

grasp-

ing a metal screwdriver shaft and touching it to the rotor contact of

S4R,

and tune the rear H band injection trimmer for maximum AVC

deflection.Detune

by touching the rotor contact of S8F and

tune

the front H band injection trimmer for maximum AVC deflection.

Tune

the G through C bands with the following set-up, tuning the R.F.

and mixer trimmers first, followed by the injection trimmers taking

care

to use the loading techniques described in 5

(above

)

The

identification and location of the trimmers

can

be found in Figure

and Figure

Calibrator or Signal Generator

BAND Frequency in MHz.

Preselector Setting

21.5

14.0

6.0

3.8

1.9

9.0

7.5

4.0

R.F. slug tops flush with

white coil form

R.F. slug tops flush with

white coil form

BANDS A and B ALIGNMENT

Remove the 47 ohm antenna load and tune in the calibrator

a signal

generator at 300 kHz on Band A and set’the preselector to exactly 6

on its

scale.

If a signal generator is used, a 10 pf coupling capacitor

should

connect

the generator to the antenna

jack.

Adjust the slugs of

shield

cans

and T4 for maximum AVC deflection.

On Band B tune in the calibrator or signal generator at 1600 kHz and

tum the preselector control fully clockwise and rough

tune

all

B band

trimmers for maximum AVC deflection.

Retune to 1400 kHz and

care-

fully peak the signal with the preselector

control.

Tune

the B

band

R.F.,

mixer, and injection trimmers

(

properly loaded

)

for maximum

AVC deflection.

The accessory crystals used especially for

align-

ment

may

now be removed.

5.3.4

NOTCH

FILTER

ALIGNMENT

Tune

in the calibrator or signal generator on LSB for a zero beat and set

the notch knob to, 3 o’clock.

The notch slug should be as far

into

the

coi1 as it

will

go without engaging the stop.

If it isn’t , rotate the notch

knob to its

OFF detent

, loosen the notch knob setscrew and tighten it in

the OFF position.

Return the knob to the 3 o’clock position and adjust the

notch slug for maximum AVC voltage (positive

going)

. Switch to AM, set

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