| Index | Thread | Archive | Jul-2000 | Archive | Send |
 |
  |
 |
   |
|
  |
|
antenna can have a poor pattern, even if the traps are very low loss. He goes to careful detail to lay out some number of possible design screwups related to traps. A trapped beam's forward gain could be the same as a dipole at same frequency and height. If there is no significant heat loss, then that power has to go SOMEWHERE. The beam pattern has to start to revert to that of the dipole or something with obvious power radiating to sides and/or rear. The trapped beam in the tribander study that has taken the heat (pun intended) has no such pattern degradation. It's pattern is as good as any other in the study. HEAT is the only answer. If you summarize the forest from all the trees in LB's usual detailed and thorough analysis, loss of gain vs. a dipole means two things, either/or, or in combination: pattern degradation due to screwed up design and/or heat loss. That's all there is. - - . . . . . . - - . . . . - - . . - . . 73, Guy k2av@contesting.com Apex, NC, USA ----- Original Message ----- From: Natan Huffman <force12e@lightlink.com> To: F12Reflector <force12talk@qth.com> Sent: Monday, July 17, 2000 2:23 PM Subject: [Force 12 Talk] Trap Losses versus heat > thanks to Jim Reid KH7M for finding L.B. Cebik's explanation as to why the > absence of heat can still mean loss. > .... see long prior post... -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force 12 Web site: http://www.qth.com/force12 Submissions: send to Force12Talk@qth.com To unsubscribe: send a blank e-mail to Force12Talk-leave@qth.com Force12Talk Message Archive: http://www.qth.com/force12/list/force12talk For problems with the list, contact force12@qth.com |
This Thread
|
This Author (Jul-2000)
|