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(Night Ranger) wrote in message om...
If you know anything at all about legitimate radio antenna theory then the following CB antenna is worth a chuckle. I don't know if this guy is clueless or just dishonest, but which ever it is you definitly do not want him repairing your CB radio. Star Gun Mobile Beam Antenna (laugh) http://cbrepairs.com/index.htm I've actually seens someone driving down the road with one of those contraptions on the roof. I think it was a VW Jetta... Quite a site! |
#53
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In , Lancer
wrote: snip The current distribution for the coil isn't uniform, (input current output current). So it won't evenly dissipate heat, it will be hotter where the greatest current flow is. Good point. snip ..... In fact, coils with very high Q are very poor radiators. No, but an antenna with a high Q coil is more efficient, due to the lower loss in the coil. I think that was intended to mean, "....an antenna with a high Q coil is more efficient than an antenna with a low Q coil,....", which isn't exactly true. There are many helical antennas in use. As inductors they have very low Q, yet they are more efficient radiators than some antennas with high Q loading coils, and far more efficient radiators than the coils themselves. Don't forget that resistive loss is -only one- of the factors that determine radiation resistance. Again I point out that those huge loading coils have significant eddy current and reflective losses due to the fact that they are so large and are mounted with the axis perpendicular to the roof of the vehicle. And if that roof is ferrous (as most of them are), that's just like adding a solid iron core to an HF air-core coil -- bad news. Although increasing the conductor diameter (and therefore the overall size of the coil) is a basic technique to achieve a higher Q, it is nonetheless 'basic' and fails to account for all other relevant factors in the intended application, even factors that can negate any improvement that would be expected from the bigger coil. Besides that, they are ugly. But if someone want's to drive a vehicle that looks like it collided with George Jetson's space buggy then that's their problem, not mine. -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
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