Re: Re: Antenna Length Calculation...was: "your mail"

[KSMITH1@mailgw.sanders.lockheed.com]

Dan Masi wrote, in part, with edited inclusions:

> Phil said:
> 
> > 
> > The ideal length is a 1/4 wavelength, minus a tad.  For VHF/FM
> > reception, say 
> > of a 93MHz station, the calculation (in metres) is something like:
> >  
> > Speed of light:         300,000,000 
> >                         -----------   /  4    (quarter wave)
> > Frequency:               93,000,000          
> > 
> > So the ideal length is around 80cm, or about 20.5 inches. 

The error is here; 80 cm is 31.5 inches (English (!) units) 

Kurt said:
 
> So, with 93.0 mHz we get: 2808/93.0 =  30.1935483871
> 
> I think it will be safe to drop most of the digits after the 
> decimal...hehheh.  So, for 93.0 mHz we're talking about just over 30 
> inches.

Dan said:

>Kurt, what was wrong with Phil's calculation?  He calculated,
>correctly, that 1/4 wavelength of a 93Mhz signal, in free space,
>is about 20 inches. 
[aka 30 real inches]

>Dan Masi, minister of propagation of non-Audi content


***                 ...Kirby    (Kirby A. Smith)                 ***
***                      2 X 1988 90q                            ***
***              ksmith1@mailgw.sanders.lockheed.com             ***
***              [=]   kirby.a.smith@lmco.com                    ***
***  Opinions expressed herein are entirely those of the author. ***