[Antennas] Vertical Rrad, capacity hat formulae request

Thu, 11 Mar 2004 10:35:33 -0600

Download EZNEC demo from W7EL and model the antenna?

73, George W5YR
Fairview, TX
[email protected]
http://www.w5yr.com

----- Original Message ----- 
From: "tttt ccccc" <[email protected]>
To: <[email protected]>
Sent: Thursday, March 11, 2004 9:48 AM
Subject: [Antennas] Vertical Rrad, capacity hat formulae request

> I'd be grateful for the formula to calculate Rrad for vertical monopoles
> greater
> 
> than 90 degrees long.
> 
> 
> Also, do the standard "surge impedance" and "short circuit at the top of
> the
> 
> antenna" formulae hold up if the antenna is more than 90 degrees long?
> 
> 
> I'd also be grateful for the formula (ae) to calculate the effect of
> adding top loading
> 
> wires at 90 degrees to an exsisting top loading wire.  And the formula
> that would
> 
> account for adding a "rim" wire about these wires.  
> 
> 
> Yet another query:
> 
> I'm looking into a 5/8 wave ground-mounted vertical and would be
> appreciate any
> 
> starting point values for the resonating and matching reactances.
> 
> Be Well,
> 
> Tim  K3HX
> 
> 
> 
> Can't find it in the ARRL Publishing Company's Antenna  Book and the
> nomograph
> 
> printed therein appears  inaccurate.
> 
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