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  Topic: Feeding a Log-Periodic antenna
rtso

Replies: 0
Views: 7912

PostForum: Questions Related to Antenna Theory   Posted: Sat Apr 16, 2011 6:30 am   Subject: Feeding a Log-Periodic antenna
For a Log-Periodic antenna, I have seen the feed at the smallest dipole.

What happens to the return loss if the feed is placed at the largest dipole, or somewhere in the middle?

What is the Zo o ...
  Topic: Cell Phones Affect Areas of the Brain, Study Shows
rtso

Replies: 4
Views: 23204

PostForum: News   Posted: Sat Apr 09, 2011 3:23 pm   Subject: Cell Phones Affect Areas of the Brain, Study Shows
I read somewhere that the limit was based on keeping the temperature rise of the brain below a certain limit, for a certain talk time.

1.35kg is the average human brain mass.
The human brain is 85 ...
  Topic: Paper Thin Flat Antenna
rtso

Replies: 2
Views: 12265

PostForum: Questions Related to Antenna Theory   Posted: Sat Apr 09, 2011 2:47 pm   Subject: TV signals are horizontally polarized - Why?
thanks BigSteve! Great answer!

You're right! I was thinking omni-directional would be in the useful sense, but in this case it's a technicality that lends itself to more marketing hype than anyth ...
  Topic: Paper Thin Flat Antenna
rtso

Replies: 2
Views: 12265

PostForum: Questions Related to Antenna Theory   Posted: Fri Apr 08, 2011 4:41 am   Subject: Paper Thin Flat Antenna
Maybe you've seen this advertised - an indoor, "paper thin" flat antenna for HDTV. It is only 9" x 11.5" and it is very flat. It got very good reviews on Amazon. Looks to be p ...
  Topic: 50 ohm Network Analyzer for 75 ohm HDTV antenna
rtso

Replies: 2
Views: 10010

PostForum: Questions Related to Antenna Theory   Posted: Fri Apr 08, 2011 4:21 am   Subject: 50 ohm Network Analyzer for 75 ohm HDTV antenna
Schubert - That was a great answer. Thank you very much!!
  Topic: 50 ohm Network Analyzer for 75 ohm HDTV antenna
rtso

Replies: 2
Views: 10010

PostForum: Questions Related to Antenna Theory   Posted: Mon Apr 04, 2011 4:37 am   Subject: 50 ohm Network Analyzer for 75 ohm HDTV antenna
If I have a TV antenna that is designed for 75 ohms, what do I have to do in order to get a proper measurement of S11? My Network analyzer is 50 ohms.
 
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