Re: Topband: Spitfire.......one more question

2013-11-17 Thread Grant Saviers
And one more question - ON4UN in V5 states that the Spitfire will lose a few db of gain due to ground losses. How does one calculate near field ground losses? What software is needed? A related question is a general one for antennas with near ground horizontal elements - e.g. Bruce & delta

Re: Topband: Spitfire.......one more question

2013-11-17 Thread Eduardo Araujo
Many thanks Tomexcellentas usual. Unfortunately it is impossible to avoid the question. Good F/B is what I have with little gain which could coincide with your modeling. Which could be the element dimension your modeling suggest to improve gain? Making the director longer to in

Re: Topband: Spitfire.......one more question

2013-11-17 Thread Tom W8JI
<< You better have a good HV relay for that! In my case I have a relay installed at the corner of the elemen

Topband: Spitfire.......one more question

2013-11-17 Thread Eduardo Araujo
Hi Topbanders, I am preparing my next move with the spitfire. I have one more question (for those with modeling tools?). In order to detune the elements to allow omnidirectional radiation from the vertical, authors suggested to ground the elements where they are switched from director to refle