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570 [2007/02/19 20:10] n5na created |
570 [2008/09/19 21:45] n5na |
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===== Description ===== | ===== Description ===== | ||
Medium power solid state cw transceiver covering 80 - 10 meters. Double direct conversion receiver. Built-in AC power supply. | Medium power solid state cw transceiver covering 80 - 10 meters. Double direct conversion receiver. Built-in AC power supply. | ||
+ | |||
+ | ===== Reviews ===== | ||
+ | *[[http://www.eham.net/reviews/detail/503|eHam]] | ||
+ | *[[http://p1k.arrl.org/cgi-bin/topdf.cgi?id=70763&pub=qst|Product Review, QST, 1977, December]] (Must be an ARRL member and logged in to view.) | ||
+ | |||
+ | ===== Mods & Tips ===== | ||
+ | *[[http://www.io.com/~n5fc/c21_pto.htm|Rebuilding the Century 21 PTO / Vernier]] by N5ESE | ||
+ | *[[570humfix|Hum Fix]] | ||
+ | *[[http://personalpages.tds.net/~k8ai/|K8AI Century 21 Repair Page]] | ||
+ | |||
+ | ===== Sales Information ===== | ||
+ | {{570_01_78.jpg?100|}} | ||
+ | |||
+ | ===== 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 ===== | ===== Specifications ===== | ||
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***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]]. | ***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 40<sup>o</sup> change from 70<sup>o</sup> to 110<sup>o</sup>, after 30 minute warmup. Less than 20 Hz change from 105 to 125 VAC line voltage. | ***VFO Frequency Stability:** less than 20 Hz change per degree Fahrenheit, averaged over a 40<sup>o</sup> change from 70<sup>o</sup> to 110<sup>o</sup>, 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. | ***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. | ***Power Requirements:** 105 - 125 VAC, 50-60 Hz. 10 watts receive, 100 watts transmit. | ||
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==== Receiver ==== | ==== 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. |