DRAKE SPR-4 Especificações descarregar pdf (Página 29)

6.3

When the mode switch is in the AM or USB position, shorting the RTTY

jack

will have no

effect.

INSTALLATION

This modification should be made by a

competent

technician.

If you need

help or want the RY-4 to be installed by

one

of our factory authorized

service centers or by the factory service

technicians

, please

call

write

our Customer Service Department .

Disconnect the speaker

cable,

the line

cord

, and remove the SPR-4 cabi-

net.Mount the circuit board in the location

shown

in Figure 12 using

a No. 4 sheet metal screw with a No. 4 lockwasher between the screw-

head and the mounting foot. Some early SPR-4 Receivers

may

not have

the hole in the

chassis.

In this case, mount the circuit board foot under

the No. 6 nut on the

PTO

spade bolt as shown in Figure 12.

Mount the phono

jack

(with nut,

lockwasher

and ground lug on the inside

of the

chassis)

in the hole

to the grounding screw on the rear apron

of the

chassis.

Connect the .01 disc capacitor between the phono

jack

and the ground lug.

Solder only the ground lug.

connect

the 3 wires

between the terminals on the RY-4 circuit board and the terminals on the

BF0

board as shown in Figure 13.

Use bare wire and sleeving .

D 0

N 0 T

use

any

more heat than necessary when soldering the termi-

nals as the circuit boards

may

be damaged.

Connect the 3

color

coded

wires between the RY-4 circuit board terminals

and switch S-14R as shown in Figure 13

Connect the white/yellow

wire

from

the RY-4 circuit board to the installed phono

connector.

Dress

this wire

along

the wiring harness

Solder

all

connections.

The

BF0

transformer T-17, must be adjusted for 50 kHz. Place the mode

switch in the USB position and the RF gain control fully clockwise. The

position of the

crystal

selector, range switch, and preselector is unim-

portant.Connect a clip

lead

with a

series

blocking capacitor of 1000 pf

between the terminal on T-15 and the 10 K resistor of the SCC-4

crystal

calibrator .See Figure

and Figure 12

Adjust the slug in T-17 for

zero beat.Remove the clip lead and replace the cabinet, If an SCC-4 is

not available, follow the B.F.O. alignment in “5

-3.1”

and make certain

the RTTY

jack

on the rear of the SPR-4 is not connected to ground.

6.3.3 OPERATION

Reception of standard shift (850 Hz) RTTY signals is accomplished by

placing the mode switch in

position

and

shorting

the

RTTY

jack

with

an external switch provided by the user. Reception of narrow shift

(

170 Hz ) RTTY signals is accomplished by placing the mode switch in CW

position and shorting the RTTY

jack

with an external switch.

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