[TowerTalk] Log Periodic Choice

[W5CPT]

Theoretically all the elements interact somewhat at all frequencies.  However the effect of the smaller elements on the lower frequencies and the inverse of that, being the largest elements on the higher frequencies is minimal. 

My T-6, 6 elements on a 12 foot boom compares favorably with a Tri-bander with an equal boom length.  What I lose in not having 3 full dedicated elements tuned to the band of interest, I make up in no trap loss.  And I get gain in all 5 bands where the closest you can come to that is unity on the WARC bands similar to a dipole.

I have given up trying to either believe or understand the published gain figures of commercial antennas because of the variations one could (and many do) employ to make their particular antenna more marketable.  The easiest way to understand it is:

The longer the boom, the higher the gain.  All the rest is embroidery.

I would tell you to read the published data and keep a bucket of skepticism along side while doing so.

We really need a new edition of the Beam and Vertical Antenna Comparisons that came out some time ago with the latest crop of air cooled dummy loads included  - ;^) -(big grin).

There are Yahoo Groups dedicated to many of the newer antennas and the Reviews on eHam that bear some examination, albeit with your bucket of which I spoke earlier.

Clint - W5CPT - Moderator of one of those groups - 



  ----- Original Message ----- 
  From: Mike 
  To: towertalk at contesting.com 
  Sent: Thursday, September 11, 2008 7:58 PM
  Subject: Re: [TowerTalk] Log Periodic Choice


  Clint, this maybe a silly question, but how many elements on each band.  I
  looked at the website, but I could not find.  Certainly a good price though.

  Mike

  -----Original Message-----


  The T-8 from Tennadyne.  18 Foot boom for $754 - Hard to beat.

  Clint - W5CPT - Moderator Tennadyne Yahoo Group -


    ----- Original Message ----- 
    From: Michael Ryan 
    Cc: towertalk at contesting.com 
    Sent: Thursday, September 11, 2008 7:30 PM
    Subject: [TowerTalk] Log Periodic Choice


    Let the games begin...
    I have a good friend with somewhat limited rotational space ( does that
  make
    sense? ...small yard ).  He has a yard that does not allow for long boom
    yagis, stacks, etc.  He would like to have a log periodic, something along
    the size and boom length of the Force 12 XR-5, Teledyne, etc.  Anyone have
    some suggestions for a mulit-band ( w/WARC ) band beams with a boom length
    under 20ft?  THANKS!  - Mike


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