[BC] Elevated radials

[Cowboy]

On Wednesday 27 June 2012 12:27:21 am Mike McCarthy wrote:
> It's a ratio thing.  What is 1/4" at 450 is 450x that at 1Mhz.  Which translates to nearly 5' at 1500, 9'-4". at 1MHz and nearly 18ft. at 560.  BIG steel...
> 
> MM
> 
> On 6/26/2012 9:05 PM, James B. Potter wrote:
> >Okey-dokey. So, before I open my text on or about pages 112-113 (thank you for saving me the research time), I understand that fatter towers or even wires at VHF and UHF are necessarily shorter than 234/MHz in order to resonate, and are broader in BW=lower Q. Yes? No? 
> 

 Pretty much, but also mitigated by mutual coupling,
 operating impedances, current distribution, and the like.

 Think of it as how much is the difference in percent of a wavelength, 
 then narrow that with mutual coupling, network Q, etc.

 A 24 inch tower is humungous at VHF, and tiny at MW.

 Is an 18 foot face at 560 really cost effective when compared to
 the cost of broad banding in the ATU design ?

-- 
Cowboy