DRAKE SPR-4 Spezifikationen PDF herunterladen (Seite 26)

6.1

6.1.1

6. ACCESSORIES

MCDEL SCC-4 CRYSTAL CALIBPATOR

GENERAL DESCRIPTION

6.1.2

6.1.3

The SCC-4 is a 100 kHz crystal controlled oscillator that

injects

into the

receiver a

harmonic

every 100 kHz throughout the SPR-4 frequency

cover-

age .

INSTALLATION

Remove the top row of 3 screws on each side of the SPR-4 cabinet.

Dis-

connect the power

cord,

internal speaker

cable

and remove cabinet top.

Install the SCC-4 by inserting it into the socket marked CALIBRATOR at

the left rear of the SPR-4

chassis.

Replace the cabinet top, power

cord,

and speaker

cable.

OPERATION

The calibrator is switched on by placing the accessories switch on the

front panel in the CAL position.

6.1.4

CIRCUIT DESCRIPTION

Transistor Q2 and the 100 kHz

crystal

form the oscillator which drives the

harmonic

amplifier Q1.

Harmonics

of 100 kHz are generated by the wave

shaping diode

CRl.’

The amplified 100 kHz

harmonics

are coupled to the

SPR-4 antenna

input

through C2.

6.1.5

SERVICE DATA

A voltage

chart

,schematic

and a circuit board layout, Figure 7

are

provided for servicing the SCC-4.

6.1.6

ALIGNMENT

The SCC-4

factory aligned, but due to shock and vibration

during

shipment, or normal long term drift,

adjustment is sometimes

necessary .

Tum on the receiver and the calibrator and allow it to warm up for at

least 30 minutes

Tune

in a standard frequency station such as WWV

Carefully adjust the ceramic trimmer capacitor located on top of the

cali-

brator circuit board for zero beat .

This completes

all

necessary

align-

ment.

6.2

6.2.1

MODEL 5-NB NOISE BLANKER

GENERAL DESCRIPTION

The 5-NB is a solid state noise blanker for use with the SPR-4 Receiver.

The 5-NB works by muting the receiver for the

duration

of the noise

24 -

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 65 66

Kommentare zu diesen Handbüchern

Keine Kommentare

DRAKE SPR-4 Spezifikationen Seite 26

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Empfänger DRAKE SPR-4