Collins 51S-1 
Tube 5670 (1), 6AK6 (1), 6AU6 / 7543 (2), 6BA6 (4), 6BF5 (1), 6DC6 (1), 6EA8 (5), 12AX7 (2) Semiconductor 1N1492 (3), 2N388 (1), 2N6373 (4), 1N34A (4) BEHIND THE FRONT PANEL  
Specifications ・FREQUENCY RANGE : 200 KHz to 30 MHz in thirty 1 MHz segments ・MODES : Selectable USB, LSB, CW or AM. ・POWER REQUIREMENTS: 51S-1/51S-1F 115/230 vac, 50-400 Hz; power consumption is approximately 125 watts 51S-1B 115 vac, 50-400 Hz; power consumption is approximately 125 watts 51S-1A/51S-1AF 28 VDC, 4.5 A ・HARMONIC AND OTHER SPURIOUS RESPONSE: Image rejection better than 50 dB from 2 to 25 MHz and better than 40 dB from 25 to 30 MHz Internal spurious signals below 1 uv equivalent antenna input Other spurious signals better than 70 dB except for 4.8 to 5.2 MHz (better than 40 dB) ・AUDIO NOISE LEVEL : Not less than 40 db below 1 watt ・CALIBRATOR : 100 kHz crystal oscillator ・FREQUENCY STABILITY: Following a 20-minute warm-up and for a temperature change of from 0 to 50 deg C: Within 885 Hz at tuned frequencies between 2 and 7 MHz ; within 36 PPM (+/- 400 Hz) at 7 MHz to 27 PPM (+/- 400 Hz) at 30 MHz. Not more than 100 Hz with 10% line voltage variation. ・CALIBRATION ACCURACY : Within 400 Hz after nearest 100 kHz point calibration ・BACKLASH : Not more than 150 Hz. ・VISUAL DIAL ACCURACY : 200 Hz on all bands. ・SENSITIVITY : AM mode 3.0 uv for 10 db signal-plus-noise-to-noise ratio (2 to 30 MHz). 15.0 uv for 10 db signal-plus-noise-to-noise ratio (0.5 to 2.0 MHz). 20.0 uv for 10 db signal-plus-noise-to-noise ratio (0.2 to 0.5 MHz). 5.0 uv for 10 db signal-plus-noise-to-noise ratio, 55G-1 Preselector (0.2 to 2.0 MHz). SSB/CW mode 0.6 uv for 10 db carrier on - carrier off (2 to 30 MHz). 3.0 uv for 10 db carrier on - carrier off (0.5 to 2.0 MHz). 4.0 uv for 10 db carrier on - carrier off (0.2 to 0.5 MHz). 1.0 uv for 10 db carrier on - carrier off, 55G-1 Preselector (0.2 to 2.0 MHz). ・SELECTIVITY SSB (3.5 dB points, mechanical filter): 2.75 kHz (optional filter 2.40 kHz). CW (6.0 dB points, mechanical filter): 800 Hz nominal (optional filter 250 Hz). AM (6.0 dB points, IF transformers): 5.0 kHz nominal; 22.0 kHz (60 dB points). ・Q-MULTIPLIER NOTCH REJECTION : Better than 40 dB ・VARIABLE FREQUENCY OSCILLATOR : 70K-7 permeability tuned oscillator (PTO) ・ANTENNA INPUT IMPEDANCE : 50 ohms nominal, unbalanced ・AUDIO OUTPUT LEVEL : 1 watt at AGC threshold, 3 watts maximum. ・AUDIO OUTPUT REQUIREMENTS : Speaker: 3-4 ohms / 600 ohms. Phone Patch : 600 ohms ・AUDIO BALANCED REMOTE LINE OUTPUT : 600 ohms ・AUDIO FREQUENCY RESPONSE (AM) : 200 to 2500 Hz (+/- 6 dB) ・AUDIO DISTORTION : Not more than 10% at 1 watt ・AMBIENT TEMPERATURE : 0-50 degC ・AMBIENT HUMIDITY RANGE : 0%-90% ・ALTITUDE : 0-10,000 ft ・PROTECTIVE DEVICES : Fuse in ac line ・SIZE : Receiver with feet : 14 3/4" W, 7 3/4" H, 14" D (37.47 cm W, 19.69 cm H, 35.56 cm D) ・WEIGHT : 28 lbs. (12.7 kg). BACK TO HOME |