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Re: [OM] IMG: Airport Observations

Subject: Re: [OM] IMG: Airport Observations
From: Ken Norton <ken@xxxxxxxxxxx>
Date: Mon, 17 Dec 2012 21:19:26 -0600
I was just Doing a little research and I think that's a multiband
(30-500MHZ) antenna. Unlike typical tuned antennas, it actually has
multiple antennas inside. For reduced range and mobility they can be kept
in the lowered position, but can be unclipped. CAP in that part of the
country uses repeaters (and simplex) in the 140-150MHz range. By using a
multi-band antenna, only one antenna is required for terrestrial, aviation
and military communications. The elements inside are usually dipole to
avoid the need for a ground-plane.

On Monday, December 17, 2012, Jim Nichols wrote:

> Hi Mike,
>
> I think I have finally worked it out.  The CAP uses a couple of frequencies
> around 26.6 Mhz for searches.  At this frequency, a half wavelength is 17.6
> feet, or about the length of the van.
>
> Jim Nichols
> Tullahoma, TN USA
> ----- Original Message -----
> From: <usher99@xxxxxxx <javascript:;>>
> To: <olympus@xxxxxxxxxxxxxxxxx <javascript:;>>
> Sent: Monday, December 17, 2012 7:28 PM
> Subject: [OM] IMG: Airport Observations
>
>
> > 150 MHz:
> >
> > f * λ = c
> >
> > λ = 2.0 meters (approx)
> >
> > Looks that long perhaps.
> >
> > Not on my car regardless, Mike
> > --
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>
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>

-- 
Ken Norton
ken@xxxxxxxxxxx
http://www.zone-10.com
-- 
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