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COMMUNICATIONS RECEIVER
Click to enlarge pic
Picture : RL DRAKE Company
|
 | Continuous coverage 10 kHz to 30 MHz |
| Digital synthesizer frequency control |
| Nixie tubes frequency displayed to 10Hz |
| 19" Rack Mounted |
The R. L. Drake model MSR-1 receiver is a commercial grade communications
receiver employing the most up to date solid
state devices and circuitry offering continuous coverage from
10 kHz to 30 MHz. The received frequency is indicated by six NIXIE tubes to 100
Hz. All frequency injections of the MSR-1 are
controlled by a phase locked digital synthesizer which allows
incremental frequency selection in 10, 1, and 0.1 MHz steps. The remaining 0 to
0.1 MHz is continuously adjustable by a
highly stable variable oscillator from the fine tuning knob
on the front panel. Modular construction on easily accessible printed circuit
boards is used throughout the MSR-1. The
large use of dual gate MOS-FET transistors in the MSR-1 circuitry
contributes to its superior intermodulation, AVC, wide dynamic range and
overload performance. The front panel
controls allow the operator to select frequency, AM or SSB product
detector, I. F. bandwidth, AF gain, BFO pitch, fast or slow AVC, manual RF gain
and the highly effective Drake series gate
noise blanker. ISB (Independent Sideband) is a built-in feature
of the MSR-1. Separate I.F. crystal filter, I.F. amplifier, and audio output
circuits allow two simultaneous communication
channels to be employed on one frequency assignment, doubling
the information receiving capacity. Consideration
in the design of the MSR-1 has been given to special requirements. Space is
available in the MSR-1 for additional circuit boards
to provide customized performance on special
order. The Drake MSR-1 is the best commercial grade digital synthesized receiver
available in its price range - upholding the R. L.
Drake Company’s philosophy, "More Performance and Lower Cost Through
Engineering."
SPECIFICATIONS
| Frequency Range: 10
kHz to 30.0 MHz . |
| Frequency Read-out: Complete
to 100 Hz on SIX NIXIE tubes. |
| Frequency Selection: 10 MHz
1 MHz 0.1 MHz switch selected .0 to 0.1 MHz continuously variable. |
| Modes of
Operation: USB. LSB, CW, RTTY. AM, ISB |
| Frequency Stability: Frequency
drift less than 200 Hz in any 8 hour period at constant ambient temperature between 0° to
40° C and +-10% variation from nominal line voltage after 1/2 hour warm up. |
| BFO: Derived from 5 MHz
standard oscillator or variable +-3 kHz from front panel. |
| Sensitivity: 0.01-0.5 MHz:
Less than 4 uV for 10 dB SINAD at 2.4 kHz SSB mode. Less than 25 uV for 10 dB SINAD at 6
kHz AM mode with 30% modulation. 0.5-30 MHz: Less than 0.3 uV for 10 dB SINAD at 2.4 kHz
SSB mode Less than 2.0 uV for 10 dB SINAD at 6 kHz AM mode with 30% modulation. |
| Image Rejec-tion: Greater
than 60 dB relative to 1 uV below 10 MHz. Greater than 50 dB relative to 1 uV above
10 MHz. |
| Blocking: Greater than 100
dB relative to 1 uV |
| Crossmodulation: 70 dB
relative to 1 uV l Intermodulation: 70 dB relative to 1 uV . |
| lntermodulation: 70
dB relative to 1 uV . |
| Opposite Sideband Suppression: Greater
than 60 dB at 500 Hz into the opposite sideband. |
| I.F. Band-wldth: 6 kHz, 2.4
kHz, 1.2 kHz, 0.3 kHz; Selectivity @ - 6 dB: 6 kHz, 2.4 kHz, 1.2 kHz, 0.3 kHz; @ - 60 dB:
11.5 kHz, 4.3 kHz, 2.4 kHz, 0.6 kHz; Optional filters available for other bandwidths. |
| Automatic Gain Control: Audio
output rises less than 3 dB for RF Input change of 100 dB. Attack Time: 1 ms. Release
Time: 1 sec. (normal AGC), 100 ms (fast AGC). |
| Antenna Input Impedance: 10
kHz to 500 kHz 1000 ohms, 500 kHz to 30 MHz 50 ohms. |
| Audio Output: 2 watts at 5%
max. distortion into 4 ohm load. 4 ohm unbalanced and two 600 ohm balanced out-puts. ISB
output is one of the two 600 ohm balanced out-puts. |
| Audio Hum and Noise: Greater
than 60 dB below rated output. l Power: 120/240 volts +- 10% single phase 50-420 Hz 15
watts. |
| Dimensions: 5.5 in. H. x
13.375 in. W. x 15 in. D (14 cm H x 34 cm W x 38 cm D) 17 Ibs. (7.7 kg). |
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