DRAKE SPR-4 Spezifikationen PDF herunterladen (Seite 21)

ALIGNMENT

5.1

REMOVING COVERS

Remove the AL-4 Loop Antenna if it is in use.

Remove the top three screws

each

side

of the SPR-4 and remove the top

cover

by pulling up on the

rear and then on the front of the cabinet.

Remove the remaining screws

from the bottom

cover

and lift the SPR-4 from

out

of the bottom cover.

5.2

TROUBLE SHOOTING

Careful

consideration

has been given in the design of the SPR-4 to

keep-

ing maintenance problems to a minimum.

you

experience

difficulty

recommend that

you

return the unit to your Drake dealer or write direct to

our Customer Service Department describing your problem in detail.

In-

clude

full

information concerning

external

connections,

control

settings ,

antenna used , serial number, etcetera.

DO NOT RETURN EQUIPMENT TO THE FACTORY

WITH-

OUT

PRIOR AUTHORIZATION !

The voltage and parts location

charts

which follow should be

valuable

in isolating service problems .

However, no attempt should be

made to service the SPR-4 unless

you

are

thoroughly

familiar with

elec-

tronic

circuitxy and transistor and printed circuit servicing technique.

CARE SHOULD BE TAKEN NOT TO DISTURB THE

LEAD

DRESS IN THE SPR-4 SINCE THIS. IS CRITICAL IN

SEVERAL CIRCUITS.

5.3

ALIGNMENT INSTRUCTIONS

Alignment of the SPR-4 requires the use of the following equipment.

1. A stable R

.F . signal generator with variable output that

can

ac-

curately set to

any

frequency in the range from 50 kHz to 3 0 MHz

A voltmeter having an

input

impedance of 11 Megohms or greater,

such

as a VTVM.

3. The following accessory

crys

tals

40.59

MHz

for29.5

30.0MHz

reception

39.59

MHz

for28.5

29.0MHz

reception

25.09

MHz

for14.0

14.5MHz

reception

14.59

MHz

for 3.5

4.0MHz

reception

12.59

MHz

for 1.5

2.0MHz

reception

19 -

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 65 66

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