Today's Message Index:
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1. 08:09 AM - Re: VOR/LOC/GS antenna question (Robert L. Nuckolls, III)
2. 10:48 AM - Re: VOR/LOC/GS antenna question (fasilpereira)
Message 1
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| Subject: | Re: VOR/LOC/GS antenna question |
At 12:04 PM 5/8/2023, you wrote:
><fasilpereira@yahoo.com>
>
>I'm installing a GNS-430W on my composite aircraft. I already have 2
>VOR antennas that are currently not in use because I didn't had any
>NAV radio installed.
>
>I just realized that the GNS-430W requires an input for both VOR/LOC
>and GS. The common solution for this is to install a Diplexer on a
>NAV antenna to break the signal 2 outputs, one output for VOR/LOC
>and other for GS. I have seen that some users reports a loss in VOR
>range due to the diplexer and I'm worried about it because the VORs
>are far from each other here where I live.
Yes, 'diplexers' are a signal splitting network
that routes energies from a common antenna to two
or more receivers. A well crafted VOR-LOC/GS splitter
should not seriously affect the performace of either
system. Advertised losses through such devices
are generally on the order of 1.0 dB or less.
https://tinyurl.com/2uams5xp
On the other hand, there are VOR-LOC power
'dividers' that optimize the function of TWO
VHF receivers on a single antenna. Of necessity,
these devices route 1/2 of the power from the
antenna to each receiver. Hence, a 3+ dB loss
of signal to each receiver.
>I'm considering to plug one antenna to the VOR/LOC input of the GNS and
>the other to the GS. I'm not sure if I'll need to add a diplexer to the
>GS cable and if I do, can I leave the VOR connector of the diplexer open?
Don't need one. The 'barefoot' VOR/LOC
antenna is quite efficient when operated
at the third harmonic of it's fundamental
design frequency 108-118 MHz. GS signals
cover range of 329-335 MHz.
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
Message 2
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| Subject: | Re: VOR/LOC/GS antenna question |
Bob,
So I understood that I can connect the spare VOR/LOC antenna that I have direct
to the GS BNC in the back of the GNS and that will work just fine, with no need
of any additional device between. Is that correct? I thought a 1 pF capactitor
could be required, but I was not sure....
Thanks again,
Fabricio
--------
Fabricio Pereira
Engineer / Pilot
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http://forums.matronics.com/viewtopic.php?p=510773#510773
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