Note
Ham Radio, Sep 1971, p. 5.
QST, Oct 1971, p. 129.
Popular Electronics, Jan 1972, p. 114.
QST, Apr 1974, p. 105 (DSR-2--sometime before this date)
QST, Jun 1974, p. 127. ("new" with specs)
QST, Jan 1975, p. 103.
QST, Apr 1976, p. 70.
QST, Jan 1980 p. 115. (DSR-2)
BASIC POINTS
Continuous coverage 10 kHz to 30 MHz
Digital synthesizer frequency control
Frequency displayed to 100 Hz
All solid state
AM, SSB, CW, RTTY, ISB
Series balanced gate noise blanker
Rack or desk mount
SPECIFICATIONS
Frequency Range: 10 kHz to 30.0 MHz.
Modes of Operation: USB, LSB, CW, RTTY, AM, and ISB.
Frequency Readout: Complete to 100 Hz on six Nixie tubes.
Frequency Selection: 10 MHz, 1 MHz, 0.1 MHz switch selected; 0 to 0.1 MHz, contentiously variable.
Frequency Stability: Drift does not exceed 150 Hz in any 15 minute period with a temperature change of 70ºC per hour over a range of 0 to 40ºC.
Sensitivity: Less than 0.5 uV for 10 dB SlNAD at 2.4 kHz SSB. Less than 1.0 uV for 10 dB SlNAD at 6 kHz AM
Image Rejection: Greater than 70 dB relative to 1 uV *
Blocking: Greater than 100 dB relative to 1 uv.
Cross Modulation: Greater than 90 dB relative l o 1 uv.
Intermodulation: Greater than 80 dB relative to 1 uV.
Opposite Sideband Suppression: Greater than 60 db at 500 Hz into the opposite sideband.
IF Bandwidth: 6 kHz. 2.4 kHz. 1.2 kHz. 0.4 kHz;
Selectivity @ - 6 dB: 6 kHz. 2.4 kHz. 1.2 kHz. 0.4 kHz: @ -60 dB: 11.5 kHz. 4.3 kHz. 2.4 kHz. 0.8 kHz;
Optional filters available for other bandwidths.
I.F. Outputs: 50 mV into 50 ohms at 1st I.F.: 5.05 MHz and 2nd I.F. 50 kHz.
AGC: Audio output rises less than 3 dB for RF input change of 1 uV to 100 uV; Attack time 100 microseconds; Release time 750 milliseconds (Slow AGC). 25 milliseconds (Fast AGC).
Antenna Input impedance: 10 kHz to 500 kHz. 1000 ohms; 500 kHz to 30 MHz. 50 ohms.
Audio Output: 3 watts at 5% maximum distortion into 3.2 ohm load; 1 volt
into 600 ohm output line: 3.2 ohm unbalanced and two 600 ohm
balanced outputs. ISB output is one of the two 600 ohm balanced
outputs.
Audio Hum and Noise: Greater than 60 dB below rated output.
BFO: Derived from standard clock or variable over a ±3 kHz range from front panel.
Power Requirements: 115/230 VAC 2 10% single phase 50-420 Hz 15 watts. 12 or 24 VDC supply optional.
References
Ham Radio, Nov 1971, p. 106.
