DRAKE SPR-4 Spécifications télécharger pdf (Page 22)

accessory

crystal for

reception

WWV

standard frequency trans-

mission that is most reliably received in your

area.

See Page 33

to determine crystal frequency required. This

crystal is not required if SPR-4 does not have an SCC-4 Crystal Cal-

ibra tor .

A 47 ohm

1/2

watt composition resistor

connected

across

a phono

plug

to serve as an antenna load.

scale

with accurate

1/32

inch divisions.

7. An alignment tuning wand such as General Cernent GC 8273 or

Walsco 25 16.

5.3.1

50 kHz I.F., B.F.O.,

and 50 kHz LC

Filter

Alignment

The settings of the range, preselector, crystal selector, and PT0

con-

trols

are unimportant for this portion of the alignment . 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.

Connect a VTVM to the AVC

line .

This line is accessible at the ter-

minal on the 1st I. F. board with the two white/green tracer wires

at-

tached .

Connect a 50.0 kHz unmodulated signal generator to Gate 1

(pin

Q10

which

the terminal on

T9,

right

side

and

closest

to the

front pane1 when looking into the bottom of the SPR-4 and front

pane1

facing

you.

Set the generator level SO that slight AVC deflection (negative

going)

can

be observed and adjust

T17

for

zero

beat.

Adjust T-15 and then T16 for maximum deflection of AVC voltage.

Set the signal generator to precisely 50.8 kHz and put the mode

switch on CW and tune L11, L12, L13,

and L14 for maximum AVC

deflection.Repeat tuning L11 through L14 until no further improve-

ment

can

be obtained.

5.3.2

5645 kHz

Alignment

1. With the receiver set up as in 5.3.1,

connect

the signal generator

to the

junction

of R27 and

C90.

This point is accessible at the

ter-

-20-

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 65 66

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DRAKE SPR-4 Spécifications Page 22

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