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Centaur 411 HF, Quick Start Manual, Page: 1 / 7

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Product Review Column from 

QST

 Magazine

Copyright © 1997 by the American Radio Relay League Inc. All rights reserved.

June 1997

Ten-Tec Centaur Model 411 HF Linear Amplifier

AOR AR7030 Communications Receiver

Radio Shack Model 21-527 Digital SWR/Power Meter

Summary of Contents for 411 HF

Page 1: ... QST Magazine Copyright 1997 by the American Radio Relay League Inc All rights reserved June 1997 Ten Tec Centaur Model 411 HF Linear Amplifier AOR AR7030 Communications Receiver Radio Shack Model 21 527 Digital SWR Power Meter ...

Page 2: ...with a nominal 550 mA of plate current and approximately 1700 V of plate voltage at full load The Centaur can operate satisfactorily from either 120 or 240 V ac input A four inch muffin type fan moves 100 CFM of air across the three output tubes so the amplifier runs quite cool much cooler than my Collins 30L 1 which has four 811As in the output but a rather insubstantial looking cooling fan The e...

Page 3: ...ggle switch next to the POWER switch selects STBY standby or OPR operate By following the directions Figure 1 The Ten Tec Centaur Model 411 spectral display during two tone intermodu lation distortion IMD testing Third order products are approximately 39 dB below PEP output and fifth order products are approximately 45 dB down The amplifier was being operated at 600 W output at 14 02 MHz Expanded ...

Page 4: ...mories You can save and load up to three receiver setups in the special setup memories A B or C Want to listen to music on a shortwave broadcast band Select AM or synchronous AM set the tone controls memorize a few frequencies and you are ready to go SSB your choice Preset the filter bandwidth to 2 0 kHz the mode to USB or LSB and memorize the settings Want to change from one preset to another or ...

Page 5: ...preamp on 96 dB preamp off 100 dB preamp on approximately 98 dB 3 5 MHz preamp off 94 dB preamp on 98 dB 14 0 MHz preamp off 97 dB preamp on 97 dB Third order intercept Preamp off 27 dBm preamp on 1 0 MHz preamp off 13 9 dBm preamp on 12 5 dBm approximately 17 dBm 3 5 MHz preamp off 19 9 dBm preamp on 18 7 dBm 14 0 MHz preamp off 28 1 dBm preamp on 22 0 dBm Second order intercept point Preamp off ...

Page 6: ...tch in different filters while in synchro nous mode to help dodge interference Qualitatively there was a little less noise apparent on synchronous AM detection than on ordinary AM detection but the audio quality was the same Tuning was a snap Just get close press the button for Snc and the AR7030 will automatically tune in the signal Turn the tuning dial to look else where and the radio will autom...

Page 7: ...nsor which takes up a bit more space than the digital control box The remote sensor has a mounting bracket The control box has threaded holes in each side that appear to be designed to accommodate a mounting bracket but none was supplied I subjected the meter to power levels from about 0 5 W to 600 W Readings in the average power setting the power up de fault were confusing Unless it was read ing ...

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