DRAKE R8B Owner's Manual download pdf (Page 7)

A PASSBAND OFFSET control also aids in reducing or

eliminating interfering signals by electronically shifting the

receiver's IF frequencies without disturbing the operating

frequency. This action allows the operator to electroni-

cally move interfering signals out of the receiver’s pass-

band thus utilizing the high degree of selectivity provided

by the High-Q, 8-pole IF filter.

Other built-in reception aids include selectable AGC

speed, dual antenna inputs, noise blanker(NB), RF pream-

plifier for enhancing weak signals, RF attenuator for further

improvement of strong signal handling capabilities, ad-

justable RF gain, NOTCH, TONE and SQUELCH controls.

Two independent, real time clocks provide a local and

alternative time selection. Also provided is a two event

timer.

A programmable memory area allows for 440 independ-

ent receive memories. In addition, these memories are

stored in an electronically eraseable memory chip which

does not require a battery backup and is thus impervious

to power line failure. Any of these memories may be

altered by the operator and re-stored. These memory

channels may be accessed manually or by various scan-

ning methods.

Finally, a built-in RS-232 compatible interface allows com-

plete digital control of the receiver including memory and

scanning functions.

The R8A communications receiver is a microprocessor

controlled, synthesized, all mode, world band receiver

with continuous coverage capability from 100 through

30,000 kHz. The receiver offers excellent sensitivity, selec-

tivity, high dynamic range and offers features for the most

demanding shortwave reception. Conveniently located

front panel controls allow for rapid operator program-

ming and ease of use. Operating mode and correspond-

ing bandwidth are quickly selected by front panel but-

tons. The selectable AC input allows for operation around

the world. In addition, a DC input is provided for mobile

operation.

A High-Q, 8-pole, electronically switched IF filter provides

a range of five commonly used bandwidths. These band-

widths are automatically selected by mode, however

any bandwidth may be selected at the touch of a button.

The front panel liquid crystal display provides visual feed-

back to the operator of the current status of the receiver.

The seven digit frequency display allows tuning resolution

to 10 Hz accuracy.

In the AM mode, a selectable synchronous detector

(SYNCHRO) allows for enhanced reception by eliminating

or reducing distortion due to fading signals and allowing

the passband to be shifted toward one sideband, to

reject interference, without causing audio distortion.

5 General Description

BW

AUTO

6.0 4.0

2.3 1.8

0.5

MODE

AM SYNC

LSB USB

CW FM

RTTY

SCAN

MEM

LIST

A-B

SEEK

TIME

CARR

MEM

TUNE

VFO A = B

A = B

PRE ATTN

ANT 1 2 VHF

 

AGC S F

NOTCH

NB N W

NAME



12 ON OFF

TIMER

STEP

CLK/FREQ

LOCK

TUNE

SCAN

NOTCH TONE

SCAN

MEM

6.0

4.0

AM/

SYNC

2.3

1.8 LSB USB

0.5

AUTO CW RTTY

BANDWIDTH

MODE

LIST

A - B

SEEK

TIME

CARR

CLK

LAMP

BEEP

DEL

V M

M V

SQUELCH

PASSBAND

OFFSET

VOL RF

MIN

0

R8A Communications Receiver

1 3 5 7 9 20 40 60

S UNITS DECIBLES

SIGNAL

M/KHz

MEM

CLR

kHz

MHz

1 2 3 4 5 6 7 8 9 10 11 12 ... 42 43

Comments to this Manuals

No comments

DRAKE R8B Owner's Manual Page 7

Comments to this Manuals

Related products and manuals for Receiver DRAKE R8B