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pacomment [2007/04/26 13:26]
n5na
pacomment [2007/05/20 20:45] (current)
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 It has been my experience, with over 30 years a Ten-Tec owner, that this design works great. I have never damaged a PA in all these years, nor do I personally know anyone who has. Of course there have been some Ten-Tec designs that did not automatically include current limiting. Take note of a circuit difference between the Pegasus and the Jupiter for example... or study the schematics of the Century 21, and Century 22 and you will see a few strays from this design philosophy. Nevertheless,​ the Triton Series, all the Omni'​s,​ the Corsairs, and probably the Deltas (I need to confirm this) when used with the appropriate Ten-Tec power supply had the current limiting protection required. It has been my experience, with over 30 years a Ten-Tec owner, that this design works great. I have never damaged a PA in all these years, nor do I personally know anyone who has. Of course there have been some Ten-Tec designs that did not automatically include current limiting. Take note of a circuit difference between the Pegasus and the Jupiter for example... or study the schematics of the Century 21, and Century 22 and you will see a few strays from this design philosophy. Nevertheless,​ the Triton Series, all the Omni'​s,​ the Corsairs, and probably the Deltas (I need to confirm this) when used with the appropriate Ten-Tec power supply had the current limiting protection required.
  
-Problem is that some put their Ten-Tec'​s on a power meter and don't see 100 watts output (who knows what meter they are using), now Ten-Tec specifications do not specify 100 watts exactly. Some rigs may only put out 90 watts on some bands, yadda, yadda. ​Durring ​alignment the output stages are adjusted for a particular current draw at resonance on a particular band. The output is then checked on all bands to see if it is within published specifications. If not then there isn't sufficient gain withing the transistors and they need replacing. Unfortunately,​ I know hams who have changed the internal settings of the transceiver to allow their rig to output more power (yes, it can be done... Don't ask) and then defeat the current limiting to keep their power supply from shutting down. Worse yet, they use a different power supply brand and then they may have a combination for real problems. In particular I am +Problem is that some put their Ten-Tec'​s on a power meter and don't see 100 watts output (who knows what meter they are using), now Ten-Tec specifications do not specify 100 watts exactly. Some rigs may only put out 90 watts on some bands, yadda, yadda. ​During ​alignment the output stages are adjusted for a particular current draw at resonance on a particular band. The output is then checked on all bands to see if it is within published specifications. If not then there isn't sufficient gain withing the transistors and they need replacing. Unfortunately,​ I know hams who have changed the internal settings of the transceiver to allow their rig to output more power (yes, it can be done... Don't ask) and then defeat the current limiting to keep their power supply from shutting down. Worse yet, they use a different power supply brand and then they may have a combination for real problems. In particular I am 
 thinking about power supplies like the Astron 35 or 50 series that can easily damage an output unless there is some way to limit the current supplied. thinking about power supplies like the Astron 35 or 50 series that can easily damage an output unless there is some way to limit the current supplied.
  

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