EZNEC gives similar results -- a 40-2CD at 69 feet has a radiation angle of
27 degrees, while the same antenna at 79 feet has a radiation angle of 24
degrees. Three degrees wouln't be worth the work to me. However, if you can
get a 40-2CD to 110 feet, the angle comes down to 17 degrees. That would
probably be worth it.
73, Dick WC1M
> -----Original Message-----
> From: W3YY [mailto:w3yy@cox.net]
> Sent: Saturday, October 16, 2004 3:40 AM
> To: TowerTalk List
> Subject: Re: [TowerTalk] Tower height increments
>
>
> Warren -
>
> Using HFTA and modeling a 2-el 40-m beam over flat ground,
> the lobe moves from an elevation angle of about 29 deg at
> 69ft to 25 deg at 79ft. It's probably not worth going
> through a lot of extra work to obtain this change.
>
> 73, Bob - W3YY
>
> ----- Original Message -----
> From: <WarrenWolff@aol.com>
> To: <towertalk@contesting.com>
> Sent: Saturday, October 16, 2004 7:15 AM
> Subject: [TowerTalk] Tower height increments
>
>
> > Greeting fellow TTalkers,
> >
> > I have an interesting question.
> >
> > Does anyone know what happens to the radiation lobes for a
> 40 meter
> > yagi when it height above the ground is changed from 69 feet to 79
> > feet? It boils down to whether or not the extra 10 feet is really
> > worth it --- or
> the
> > potential hassle from a City Engineer for the extra 10 feet.
> >
> > Regards, Warren Wolff; W5KKW
> >
> >
> > _______________________________________________
> >
> > See: http://www.mscomputer.com for "Self Supporting Towers",
> > "Wireless
> Weather Stations", and lot's more. Call Toll Free,
> 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
>
>
>
>
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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