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bcone1381
Joined: 25 Apr 2017
Posts: 42
Location: Southeast Michigan
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 Posted: Fri Mar 13, 2020 10:05 am Post subject: Antenna separation question |
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I am installing two Dipole antennas internally in my experimental aircraft project. These dipole antennas are 43 inches long and have no ground plane. The main antenna will be used by the Communications radio and the second will be used by the ELT. Both will be mounted vertically.
Is there a best practice separation standard in mounting these two antennas? I'l like to install both of them in the vertical stabilizer a few inches apart.
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nuckolls.bob(at)aeroelect
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| Posted: Sat Mar 14, 2020 11:46 am Post subject: Antenna separation question |
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At 01:05 PM 3/13/2020, you wrote:
| Quote: | --> AeroElectric-List message posted by: "bcone1381" <bcone1964(at)gmail.com>
I am installing two Dipole antennas internally in my experimental aircraft project. These dipole antennas are 43 inches long and have no ground plane. The main antenna will be used by the Communications radio and the second will be used by the ELT. Both will be mounted vertically. |
Is this a vhf only ELT? If it
includes 406MHz capability, then
you're advised to use the stock,
dual band antenna recommended for
the ELT.
| Quote: | | Is there a best practice separation standard in mounting these two antennas? I'l like to install both of them in the vertical stabilizer a few inches apart. |
This would be too close to expect
insignificant interaction.
Recommend you consider the built in
antenna for the VHF Comm and a
ground plane vertical whip for the
ELT.
Much more likely to achieve optimum
performance.
Bob . . .
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ceengland7(at)gmail.com
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| Posted: Sat Mar 14, 2020 12:39 pm Post subject: Antenna separation question |
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On 3/14/2020 2:41 PM, Robert L. Nuckolls, III wrote:
| Quote: | At 01:05 PM 3/13/2020, you wrote:
| Quote: | --> AeroElectric-List message posted by: "bcone1381" <bcone1964(at)gmail.com> (bcone1964(at)gmail.com)
I am installing two Dipole antennas internally in my experimental aircraft project. These dipole antennas are 43 inches long and have no ground plane. The main antenna will be used by the Communications radio and the second will be used by the ELT. Both will be mounted vertically. |
Is this a vhf only ELT? If it
includes 406MHz capability, then
you're advised to use the stock,
dual band antenna recommended for
the ELT.
| Quote: | | Is there a best practice separation standard in mounting these two antennas? I'l like to install both of them in the vertical stabilizer a few inches apart. |
This would be too close to expect
insignificant interaction.
Recommend you consider the built in
antenna for the VHF Comm and a
ground plane vertical whip for the
ELT.
Much more likely to achieve optimum
performance.
Bob . . . |
And with the dipole in the tail, the ELT ant could be fit farther forward inside the fuselage (for separation) with its own 1/4 wave ground plane.
Charlie
 Virus-free. www.avast.com [url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2] [/url]
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