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Picture : RL DRAKE DSR-2
Instruction Manual
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The DSR-2, MSR-2, and the MSR/FMP succeeded the DSR-1 and
MSR-1. These units contained gold plated switch contacts to minimize contact failure in
the salty air.
Bill Frost
Service Manager
R.L. DRAKE Company
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Continuous coverage 10 kHz to 30 MHz |
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Digital synthesizer frequency control |
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Nixie tubes frequency displayed to 10Hz |
This receiver is a commercial grade communications receiver
employing the most up to date solid state devices and circuitry. It provides continuous
coverage from 10 kHz to 30 MHz with the received frequency displayed on a digital readout
to the closest 100 Hz. All frequency injections of the receiver 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 this receiver. The generous
use of dual gate MOS-FET transistors in this receiver’s circuitry contributes to its
superior inter modulation, wide AVC dynamic range and overload performance. The front panel
controls allow the operator to Select frequency, AM or SSB detector, I.F. bandwidth, AF
gain, BF0 pitch, fast or normal AVC, manual RF gain, and Drake’s highly effective
series gate noise blanker. Independent sideband (ISB) is a built-in feature of the
receiver. Separate IF. crystal filters, I.F. amplifier, detector and audio output circuits
allow two simultaneous communications channels (USB and LSB) to be employed on one
frequency assignment, doubling the information receiving capacity. The receiver may be
powered from 120 or 240 VAC, 50 to 420 Hz. An inverter is available, as an accessory, for
operating the receiver from a 12 or 24 VDC source.
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 Iine 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 Rejection: Greater
than 60 dB relative to 1 uV below 10 MHz. Greater than 50 dB relative to 1 uV above
10 MHz. |
| Block-ing: 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-width: 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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