[TowerTalk] HF LOG-PERIODIC ANTENNAS Comments Please

[Joe Subich, K4IK]

> Not sure what you are saying about the C-4XL regarding linear 
> loading and helical hairpin.

Mechanical problems with breakage (and apparently stretching) 
of the alumoweld wire in ice/wind.  Similar self-detuning of 
the unsupported "helical hairpin" apparently due to vibration 
and/or thermal cycling. 

> BTW, does your SteppIR cover 7 MHz?  I thought that was only 
> covered on the new MonstIR.

My three element SteppIR will have the same 7 MHz capability 
as a C4 ... and it will have 10 MHz capability as well.  It 
is my own design and will be the subject of a magazine (and/or 
possibly web) article.  

Only the MonstIR has "gain" capability on 7/10 MHz at the 
present time.  SteppIR are working on other solutions to 
7/10 MHz capability in a smaller footprint/lower performance 
product but they have not completed their work or publicly 
announced any details. 

73, 

   ... Joe, K4IK