Topband: THE ITINERANT 160 METER ANTENNA PROJECT

[Jim WA9YSD]

TOM 

You said "3.) Use the largest counterpoise possible, and use one that does not 
concentrate current, zig-zag current all around, or produce unnecessarily 
high voltages." 
 
In 300 words or less please explain again Zig-zag current?

Stay on course, fight a good fight, and keep the faith. Jim K9TF/WA9YSD


________________________________
 From: Jim WA9YSD <wa9ysd at yahoo.com>
To: Top Band <topband at contesting.com> 
Sent: Sunday, August 5, 2012 7:59 AM
Subject: Re: THE ITINERANT 160 METER ANTENNA PROJECT
 

I have been clobbered every time I mention this.

Is there some one other than me that knows the following????

I had read in a Hand Book for the 1930's the 3 wire folded dipole and 2 wire folded dipole had a couple factor of 1. This would make this antenna the preferred driven element for a long yagi.

Folded dipoles are all so used when installations require long lengths of feed line.

Back when the Bazooka or Double Bazooka or other wise now known as coaxial antenna back around 1970 I think when I saw it in Ham Radio Mag.. Its coupling factor was around 0.9

No some had told me that later on the coupling fact was really Velocity Factor. Now how can the velocity factor gets interpreted as to how well a driven element couples when compared to gamma match elements or Dipole or a folded dipole or bazooka?

----See, "Ham Radio Techniques - 160-Meter Antenna Problems and Solutions," Ham Radio magazine,  Pg. 49, March 1990. A 3-wire version is also proposed to increase the radiation resistance by 9x. In the single and multi-wire folded versions the ground loss resistance remained constant. Note that Bill was obtaining his results from the K6STI antenna modeling software he was using. I am not familiar with that program's capabilities or accuracy and it is clear from the article he believed the results he obtained from it. It was the early days of NEC programs for PCs and many of us were just learning how to use and apply the antenna simulation programs. 

It is impossible
 to know the basis for his errors in this case. But Bill's contributions to amateur radio were vast and valuable and greatly overshadow this one slip-up. 

'73, Thomas - ac7a (Tucson) -----

 
Stay on course, fight a good fight, and keep the faith. Jim K9TF/WA9YSD