DRAKE SPR-4 Spezifikationen PDF herunterladen (Seite 3)

1.1

1.2

1.2.1

1. GENERAL DESCRIPTION

FEATURES

The SPR-4 is an

a11

solid-state communications receiver which

can

te

programmed with accessory crystals to

cover

150 kHz to 30 MHz. The

SPR-4 receives AM, CW, SSB

(Upper

and lower

)

and

may

be powered

from 120 VAC, 240 VAC and 12 VDC.

SPECIFICATIONS

GENERAL SPECIFICATIONS

Frequency Coverage

:

Can be programmed with accessory crystals for 23

ranges

(each

tuning a 500 kHz band

)

from

.5

to 30 MHz plus 150 to 500

kHz.

Generous PTO

dial

overtravel allows additional 50 kHz or more off

each

end of range.Crystals

supplied

with the receiver allow coverage

on these ranges

;

150

-

500 kHz

.5

-

l.0MHz

1.0

-

1.5 MHz

6.0

-

6.5 MHz

7.0

-

7.5 MHz

Modes of Operation:

Selectivity: AM

SSB

CW

RTTY

9.5

-

10.0

MHz

11.5

-

12.0

MHz

15.0

-

15.5

MHz

17.5

-

18.0

MHz

21.5

-

22.0MHz

AM, CW, SSB (Upper and lower

)

,

and RTTY with

RTTY adapter.

4_8kHz@6dB,

l0.0kHz@60dB

2.4kHz@6 dB,

7.2 kHz

@

60 dB

.44

kHz

@

6 dB,

2.7kHz@

60dB

With

RTTY

adapter, RTTY

can

be received in SSB

(

lower

)

or CW

.

Sensitivity: SSB , CW, and RTTY:

.2

5 microvolt for 10 dB S +

N/N

.

AM

:

.5

microvolt with 30% modulation for 10 dB S +

N/N

.

Intermediate Frequencies

:

1st IF 5645 kHz, 2nd IF 50 kHz.

Frequency Stability: At room temperature, drift for

a11

causes (including

+ 10% change in supply voltage) is les s than

+-

100 Hz.

-

Automatic Volume Control: AVC is used on

a11

modes. Time constants

are selected for the optimum effectiveness on

each

mode. Audio output

is held constant

to

6 dB

over

a 100 dB range of

input

signals.

Input

Impedance:

50 ohms approximately , on ranges C

-

H. On ranges

A and B,

input

is high

impedance

and plug in loop antenna is low

imped-

ance.

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