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                           AeroElectric-List Digest Archive
                                      ---
                     Total Messages Posted Wed 05/10/23: 2
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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  _____________________________________


Time: 08:09:24 AM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: 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  _____________________________________


Time: 10:48:54 AM PST US
Subject: AeroElectric-List: Re: VOR/LOC/GS antenna question
From: "fasilpereira" <fasilpereira@yahoo.com>


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


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=510773#510773


 

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