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1. 07:43 AM - Re: Antenna Question (Peter Pengilly)
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| Subject: | Antenna Question |
Only one Archer antenna is required, use antenna splitters.
I don't see a huge problem with a VOR/ILS antenna and a transponder antenna
close to each other, but would avoid if possible.
Because the frequencies are reasonably far apart and not on a harmonic there
should be little interaction. Txpdr duty cycle is very short so any
interference should be minor, but using different wing tips would minimise.
Peter
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
<owner-aeroelectric-list-server@matronics.com> On Behalf Of tomcostanza
Sent: 14 March 2022 07:17
Subject: AeroElectric-List: Antenna Question
--> <Tom@CostanzaAndAssociates.com>
Building an RV-7a with fiberglass wingtips. Had planned to use one Bob
Archer VOR antenna (AeroElectric connection chapter 13) in each wingtip.
For reasons I won't get into, I'm going to use a uAvionics tailBeaconX
transponder (250 W). For those that don't know, it has an integral antenna.
It's meant to replace the tail light, but again for reasons I won't get
into, I'm going to put it in one of the wingtips.
1) Would I be better to put the 2 Bob Archer antennas in the other wingtip?
2) Put the transponder and one Bob Archer antenna in the same wingtip?
3) Neither?
If #2, although the frequency of the xponder is 10x the freq of the VOR, the
2 antennas would only be inches apart. Seems like a bad idea to have a 250
watt transmitter that close to any antenna regardless of the frequency, but
I defer to those who know. I'm sure the two Bobs have forgotten more than
I'll ever know about antennas.
Thanks.
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Clear Skies,
Tom Costanza
-- in year 17 of a 3 year project
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http://forums.matronics.com/viewtopic.php?p=506321#506321
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