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Colyn Case
Joined: 12 Oct 2009
Posts: 13
Location: Thetford Center
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 Posted: Thu May 28, 2020 9:29 am Post subject: coax switches for sharing an antenna |
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I'm adding a second transponder to my carbon airplane and am out of places to mount a second antenna. I would only be using one transponder at a time so I am thinking of using a coax switch to select which transponder gets the antenna. I'm not sure if these are built for my application, namely a transceiver vs. a transmitter. Here's an example of one I am considering. Anything I need to look out for here?
...and what does "latching" mean?
https://www.mouser.com/datasheet/2/404/CCR-33S_CR-33S_LATCHING-1228654.pdf
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Colyn Case
colyncase@earthlink.net |
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user9253
Joined: 28 Mar 2008
Posts: 1922
Location: Riley TWP Michigan
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| Posted: Thu May 28, 2020 2:59 pm Post subject: Re: coax switches for sharing an antenna |
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A switch will fail someday. Or a transponder will inadvertently be turned on
without an antenna connected. A transponder could be damaged. I suggest
that a second antenna be installed even if the location does not comply with
the manufactures suggested spacing. It will not hurt to locate a transponder
antenna closer to a com antenna than recommended because they operate at
considerably different frequencies.
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Colyn Case
Joined: 12 Oct 2009
Posts: 13
Location: Thetford Center
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| Posted: Thu May 28, 2020 6:41 pm Post subject: Re: coax switches for sharing an antenna |
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It's complicated. to be that close to the com antenna I would have to be physically mounted in the metal that forms its ground plane.
Does the transponder blow up if its side of the switch is open?
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Colyn Case
colyncase@earthlink.net |
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Colyn Case
Joined: 12 Oct 2009
Posts: 13
Location: Thetford Center
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| Posted: Thu May 28, 2020 6:47 pm Post subject: Re: coax switches for sharing an antenna |
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nvm. i see there's a risk there...
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Colyn Case
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Colyn Case
Joined: 12 Oct 2009
Posts: 13
Location: Thetford Center
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| Posted: Thu May 28, 2020 8:04 pm Post subject: Re: coax switches for sharing an antenna |
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Wait. Does a transponder ever transmit without receiving anything?
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Colyn Case
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cluros(at)gmail.com
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| Posted: Thu May 28, 2020 8:05 pm Post subject: coax switches for sharing an antenna |
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I think most transponders have a supression line that is used to make sure only one can transmit at a time. No switching required.
On Thu, May 28, 2020, 19:52 Colyn Case <colyncase(at)earthlink.net (colyncase(at)earthlink.net)> wrote:
| Quote: | --> AeroElectric-List message posted by: "Colyn Case" <colyncase(at)earthlink.net (colyncase(at)earthlink.net)>
It's complicated. to be that close to the com antenna I would have to be physically mounted in the metal that forms its ground plane.
Does the transponder blow up if its side of the switch is open?
--------
Colyn Case
colyncase(at)earthlink.net (colyncase(at)earthlink.net)
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cluros(at)gmail.com
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| Posted: Thu May 28, 2020 8:51 pm Post subject: coax switches for sharing an antenna |
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Squawk Ident?
On Thu, May 28, 2020, 21:10 Colyn Case <colyncase(at)earthlink.net (colyncase(at)earthlink.net)> wrote:
| Quote: | --> AeroElectric-List message posted by: "Colyn Case" <colyncase(at)earthlink.net (colyncase(at)earthlink.net)>
Wait. Does a transponder ever transmit without receiving anything?
--------
Colyn Case
colyncase(at)earthlink.net (colyncase(at)earthlink.net)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=496565#496565
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