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Click to enlarge pic
Picture : RL DRAKE Company
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| The R8 communications
receiver is a microprocessor controlled, synthesized, all mode, world band receiver with
continuous coverage capability from 100 kHz through 30 MHz. The R8 offers excellent
sensitivity, selectivity, high dynamic range and offers features for the most demanding
shortwave reception. Conveniently located front panel controls allow for rapid operator
programming and ease of use 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 pro-vides a range of five commonly used bandwidths.
These bandwidths 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 feedback 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.
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 electronically move interfering
signals out of the receiver’s passband thus utilizing the high degree of
selectivity provided by the High-Q, 8-pole IF filter.
Other built-in reception aids include selectable AGC, noise blanker (NB), RF
preamplifier for enhancing weak signals, RF attenuator for further improvement of strong
signal handling capabilities, adjustable RF gain, NOTCH, TONE and SQUELCH controls.
A CLOCK (CLK)/TIMER capability allows for unattended recording of a desired program.
A programmable memory area allows for 100 independent receiver set up memories. In
addition, these memories are stored in an electronically erasable 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 scanning methods.
Finally, a built-in RS-232 compatible interface allows complete digital control of the
R8 including memory and scanning functions.
SPECIFICATIONS |
 | A seven character alphanumeric liquid
crystal display provides for customized display of frequency. Display also indicates
status of selected operating parameters. |
| Direct entry of mode and bandwidth selection via keypad
for easy and quick selection of receiver operating parameters. |
| Synchronous detector for improved quality of received
AM signals, especially under severe fading conditions |
| Wide frequency coverage (100 kHz to
30,000 kHz). Additional VHF bands (35-55 MHz and 108-174 MHz) with optional VHF converter. |
| Five built-in bandwidths for reception of signals under
virtually any conditions |
| Non-volatile memory for information retention during
power outage. |
| 100channel memory capacity for storing of frequency,
band, and mode data |
| Selectable kHz or MHz modes for entering and displaying
frequency. |
| Multiple scan function, for scanning by carrier, time,
or seek modes of frequency or selected memories. |
| Two operating VFO's for increased flexibility and
convenience |
| Built-in pre-amp and attenuator for improved reception
of extremely weak signals, as well as very strong signals |
| Built-in noise blanker for reduced electrical
interference |
| Pass Band offset for reduction of nearby interfering
signals while maintaining maximum intelligibility |
| Selectable AGC delay for improved reception of fading
signals. |
| Built-in multi-voltage power supply for operation in most parts of the world on
nearly any type of power line voltage |
| RS232C serial interface for remote control of receiver
functions. Responds with signal level report |
| Two clock timers |
| Sequential tuning through all memory preset channels |
| Built-in speaker |
| PLL synthesized |
| Multiple antenna inputs |
| Connections for an external speaker and tape recorder |
| Made in the U.S.A. |
SPECIFICATIONS
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Frequency Range : 0.1-30 MHz
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Modes : AM, LSB, USB,RTTY. CW, FM
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Sensitivity: SSB, CW : Less than 0.5 uV
0.130 MHz (10dB S+N/N) : Less than 0.25uV, 1.8-30 MHz (preamp on)
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| Sensitivity: AM : Less than 1.5 u V
0.1-30 MHz (10dB S+N/N) : Less than 0.8 uV 1.8-30 MHz (1000 Hz, 30% mod) : (preamp on)
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| Sensitivity: FM : Less than 0.5 u V
1.8-30 MHz (12 dB SINAD)
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| Frequency Stability : +-10ppm,-10° to
50° C
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| Frequency Accuracy : Better than +- 100
Hz, - 10° to 50° C
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| Selectivity: AM, LSB, USB,RTTY. CW :
6 KHz @ -6 dB, less than 12 KHz @-60dB
4 KHz @ -6 dB, less than 8 KHz @-60dB
2.3 KHz @ -6 dB, less than 4.5 KHz @ -60 dB
1.8 KHz @ -6 dB, less than 3.6 KHz @ -60 dB
500 Hz @ -6 dB, less than 1.5KHz@-60dB
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| FM Only :
12 KHz @ -6 dB, less than
25 KHz @ -60 dB
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| Ultimate Selectivity : Greater than 95 dB
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| Image Rejection : Greater than 80 dB, 0.1
MHz to 30 MHz
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| IF Rejection :
Greater than 80 dB, 45 MHz
Greater than 100 dB, 50 KHz
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| Dynamic Range : Greater than 90 dB,
0.1-30 MHz @ 20 KHz spacing
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| IP3 - Intercept Point :Greater than +5
dBm @ 20 KHz spacing greater than -20 dBm @ 5 KHz spacing
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| 1st IF : 45 MHz
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| 2nd IF : 50 KHz
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| AGC :Threshold: 0.8 uV, Attack time: 1mS, Release time: SLOW: 2 Sec, FAST:
300 mSec, Less than 4
dB change in audio output for 100 dB input change ref. AGC threshold
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| Ant 1, Converter : 50 ohms unbalanced
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| Ant 2 : 50 or 500 ohms unbalanced
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| Notch Filter Attenuation : AF type, 40 dB
min. Depth (500-5000 Hz)
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| External Speaker Output : 2.5 W, 4 ohms @
less than 10% distortion
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| Recorder output : 300 mV, 4.7K ohms
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| Demod output : 300 mV, 4.7K ohms
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| AC Power Requirements : 100/120/200/240
VAC, +-10% 50 or 60 Hz, 40 Watts nominal
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| DC Power Requirements : 11-16VDC @ 2A
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| Operating Temperature : - 10° to +50°
Celsius
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| Weight : 13 Ibs. (5.9 Kg)
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| Size : Width 13 1/8" (33.4 cm),
Height 5 1/4’ (13.4 cm) including feet, Depth 13" (33 cm), including front knobs
and rear connectors
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ACCESSORIES
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1590
VHF converter with frequency coverage of 35-55 MHz and 108-174 MHz.
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Complementary styled
MS-8 external speaker.
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R8PC
communications software package written for IBM XT/AT and compatibles to allow
enhanced operation.
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CAUTION: The optional VHF Converter accessory should be
installed by a
qualified service technician to prevent personal injury or damage to the equipment.
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