View Single Post
  #1   Report Post  
Old March 23rd 10, 01:24 AM posted to rec.radio.amateur.antenna
Joel Koltner[_2_] Joel Koltner[_2_] is offline
external usenet poster
 
First recorded activity by RadioBanter: Dec 2007
Posts: 133
Default Measuring antenna loss: Heat balance?

I know that many people think G3LHZ is a little bit off his rocker, but out of
curiosity... what he suggests on slide 15 he
http://frrl.files.wordpress.com/2009...heuristics.pdf -
- is that a valid approach to measuring antenna efficiency? -- Use a thermal
camera to note how much an antenna heats up with a given input power, find out
how much DC power it required to heat it to the same temperature (the
antenna's loss), and -- poof! -- antenna efficiency = (input power-loss)/input
power?

What are the significant loss mechanisms that he's not accounting for? (He
claims his matching network isn't getting at all hot.)

Thanks,
---Joel