RadioBanter - View Single Post

February 7th 04, 04:10 AM

On 07 Feb 2004 03:46:51 GMT, oUsama (Yuri Blanarovich)
wrote:
I used the knowledge to design more efficient mobile antenna for 160.

What design did you start with and at what efficiency?

What design did you end up with and at what efficiency?

If you understand the current distribution along the loaded antenna, then you
can maximize it for better efficiency (roughly proportional to the area under
the current curve).

What was the improvement in efficiency?

Hi Yuri,

Marketing claims are cheap and I need only pick up a copy of People
Magazine off the newsstand to read them for free.

I've already played the game through modeling using the exact methods
described at your page. Results were less than 1dB; average
difference ran towards 0.5dB. Since that time, the argument has
bloomed to include coils the size of a cadillac on 3/4 wavelength
structures to no greater efficiency gained. I've also seen this
described in terms of half cycles of instantaneous variable phase
*net* current moving in opposite directions through a resistor!
Heating and cooling? ;-)

So, what gets responded to, the efficiency or Cecil's goofball claims?

73's
Richard Clark, KB7QHC