[Antennas] Need a little help
Dave Shrader
[email protected]
2002年4月17日 10:41:58 -0400
T8 is at the Tennadyne web site for full details.
http://www.tennadyne.com/specs&prices.htm
Boom is 18 feet, Longest element is 38 feet, turning radius is 20.9
feet.
Gain is 5.8 dBd [7.94 dBi].
My maximum VSWR on any frequency, ANY FREQUENCY, between 13.5 MHz to 33
MHz is 1.6 to 1.
Dave, W1MCE
anthony costa wrote:
>> can someone tellm me the dimention's of the t8?
> ----- Original Message -----
> From: "Dave Shrader" <[email protected]>
> To: "Michael Taylor" <[email protected]>
> Cc: <[email protected]>
> Sent: Sunday, April 14, 2002 8:31 PM
> Subject: Re: [Antennas] Need a little help
>> > Mike,
> >
> > I've used the Tennadyne T8 at 40 feet and am absolutely 100% pleased
> > with it. There is an excellent reason why the USAF and US State Dept.
> > use LPs ... they work great! I'm a retired USAF contractor. I'm going to
> > 70 feet this summer as optimum.
> >
> > EZNEC (demo) at 70 feet gives some relative elevation solutions for 20
> > meters. No skywarmers on 15 and 10.
> >
> > You will have multiple forward lobes and a skywarmer on 17 and 12
> > meters. But significant over the horizon lobes for VG performance.
> >
> > 20 meter summary
> >
> > 70 feet gives 2 lobes in the forward direction, a low angle and an
> > intermediate angle.
> >
> > 35 feet gives 1 lobe but at a intermediate angle.
> >
> > 60 feet gives 2 lobes, 1 low and the second a skywarmer.
> >
> > 90 feet gives 3 lobes, 1 low angle, 1 intermediate and 1 skywarmer.
> >
> > 70 feet puts the energy over the horizon not overhead.
> >
> > Note: EZNEC is a computer program that calculates antenna performance.
> > The effect of ground is approximated and the effect of nearby objects is
> > not modeled. But, it gives a visual on how the antenna SHOULD/COULD
> > perform [well maybe <grin>].
> >
> > Michael Taylor wrote:
> >
> > > I am wondering if the gain in performance justifies going from 60 to 90
> feet. The antenna covers 13-30 MHz and the 40 meter band.
> > >
> > > AL1N
> > - - -
> >
> > Your moderator for this list is:
> > Larry Wilson KE1HZ [email protected]
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> >