Century 21 Model 570

Description

Medium power solid state cw transceiver covering 80 - 10 meters. Double direct conversion receiver. Built-in AC power supply.

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Accessories

  • Keyer Model 670
  • Calibrator Model 276
  • Crystal for 21.0 - 21.5 MHz Model 271
  • Crystal for 28.0 - 28.5 MHz Model 272
  • Crystal for 28.5 - 29.0 MHz Model 273
  • Digital Mod Kit Model 274
  • DC Circuit Breaker Model 1170

Specifications

General

  • Frequency Coverage: 3.5 to 4.0; 7.0 to 7.5; 14.0 to 14.5; 21.0 to 21.5; 28.0 to 28.5; 28.5 to 29.0 MHz. (Crystal not supplied for 28.5 to 29.0 MHz, but available as accessory, Model 273.) Note - Early models only included crystals for 3.5, 7, and 14 MHz bands. Crystals for 21 Mhz and 28 Mhz bands were available as optional Models numbers 271 and 272.
  • VFO Frequency Stability: less than 20 Hz change per degree Fahrenheit, averaged over a 40o change from 70o to 110o, after 30 minute warmup. Less than 20 Hz change from 105 to 125 VAC line voltage.
  • Direct Frequency Readout: Marked in 5 kHz increments from 0 - 500 kHz, MHz markings for each band displayed.
  • Tuning Rate: Approximately 17 kHz per revolution of main tuning knob.
  • Power Requirements: 105 - 125 VAC, 50-60 Hz. 10 watts receive, 100 watts transmit.
  • Semiconductors: 25 transistors, 26 diodes, 5 integrated circuits.
  • PC Boards: 4 plug-in types, 6 integral.
  • Construction: Rigid aluminum chassis and sub-panels. Aluminum case. Grey front panel, black textured vinyl cover.
  • Dimensions: HWD 6.125" x 12.5" x 12"
  • Weight: 15.5 lbs

Receiver

  • Sensitivity: 1 uV or less for 10 dB S+N/N.
  • Selectivity: Three position; 0.5, 1.0, and 2.5 kHz.
  • VFO Frequency: 5.0 to 5.5 MHz. Double Direct Conversion.
  • Antenna Input: 50 ohms, unbalanced.
  • Audio Output: 1 watt @ 8 ohms, less than 2% harmonic distortion. Built-in speaker; PHONES jack.
  • Offset Tuning: Approximately +/- 5 kHz, defeatable with ZERO BEAT switch.

Transmitter

  • DC Input Power: 70 watts
  • RF Output Power: 25-30 watts, typical.
  • Output Impedance: 50 - 75 ohms, unbalanced.
  • T/R Switching: Full break-in cw with PIN diode switch.

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