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
F
TUNE
SCAN
NOTCH TONE
SCAN
MEM
6.0
4.0
AM/
SYNC
FM
2.3
1.8 LSB USB
0.5
AUTO CW RTTY
BANDWIDTH
MODE
LIST
2
A - B
3
SEEK
4
TIME
5
CARR
6
CLK
7
LAMP
8
BEEP
9
F
DEL
0
V M
M V
SQUELCH
PASSBAND
OFFSET
VOL RF
MIN
0
-
+
R8B Communications Receiver
1 3 5 7 9 20 40 60
S UNITS DECIBLES
SIGNAL
M/KHz
MEM
1
CLR
kHz
MHz
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 1000 independ-
ent receive memories. In addition, these memories are
stored in a battery backed-up memory chip to ensure
memory retention during 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 scanning methods.
Finally, a built-in RS-232 compatible interface allows com-
plete digital control of the receiver including memory and
scanning functions.
The R8B 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 sideband 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.
Introduction - General Description 1
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