Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision Last revision Both sides next revision | ||
|
570 [2007/02/19 20:13] n5na |
570 [2018/10/31 21:20] n5na [Mods & Tips] |
||
|---|---|---|---|
| Line 4: | Line 4: | ||
| ===== 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 ===== | ||
| + | *[[https://web.archive.org/web/20080402235822/http://www.io.com:80/~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]] | ||
| + | *[[http://p1k.arrl.org/cgi-bin/topdf.cgi?id=73688&pub=qst|Semi-Break-In for the Century 21 - Hints & Kinks, QST, 1979, December]] (Must be an ARRL member and logged in to view.) | ||
| + | |||
| + | ===== 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 ===== | ||
| Line 9: | Line 31: | ||
| ***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. | ||
| Line 26: | Line 49: | ||
| ==== Transmitter ==== | ==== 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. | ||
