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Marker Beacon in lower cowl

 
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dpharker(at)worldnet.att.
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PostPosted: Tue Dec 11, 2007 6:45 pm    Post subject: Marker Beacon in lower cowl Reply with quote
Planning on glassing in a 40 “ bare 22 gauge wire in bottom of 7A cowl for use as marker beacon antenna. One concern is that the antenna is not perfectly flat.

Anyone done this before?

Thanks

Don Harker
N767DH
Finishing
[quote][b]

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carl.froehlich(at)cox.net
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PostPosted: Tue Dec 11, 2007 7:04 pm    Post subject: Marker Beacon in lower cowl Reply with quote
It need not be flat, or straight. It need not be bare wire for that matter. Use a BNC bulkhead fitting at the firewall and a short piece of coax in the cowl side BNC connector, then transition from the center conductor of the coax to your wire. The coax shield need not extend past the connector and is not connected to anything. The coax just makes it easy to use a BNC connector to disconnect the antenna for cowl removal.

If you have a ham friend have him/her check the antenna for resonance at 75 MHZ. In free air a ¼ wavelength antenna (as your’s will be) at this frequency is 37.5 inches. If you don’t have a ham friend to check, then just use 38” or so. This is really not critical for marker beacon use.

Carl Froehlich
RV-8A (375 hrs)
RV-10 (wings)


From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Donald Harker
Sent: Tuesday, December 11, 2007 9:44 PM
To: rv-list(at)matronics.com
Subject: Marker Beacon in lower cowl


Planning on glassing in a 40 “ bare 22 gauge wire in bottom of 7A cowl for use as marker beacon antenna. One concern is that the antenna is not perfectly flat.

Anyone done this before?

Thanks

Don Harker
N767DH
Finishing
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http://www.matronics.com/contribution
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[quote][b]

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wdleonard(at)gmail.com
Guest
PostPosted: Tue Dec 11, 2007 8:30 pm    Post subject: Marker Beacon in lower cowl Reply with quote
Don,

I did something very similar to what Carl describes and it works adequate though is not as sensitive as most certified installations I have flown... Could be the RST receiver, but I blame my makeshift antenna and the interference from all the metal parts around the engine.

I did the same with my nav antenna and it worked OK, though not great. I recently changed it out for a wing-tip archer antenna an it seems to get a much more stable nav signal.
--
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net

On Dec 11, 2007 7:03 PM, Carl Froehlich < carl.froehlich(at)cox.net (carl.froehlich(at)cox.net)> wrote:
Quote:

It need not be flat, or straight. It need not be bare wire for that matter. Use a BNC bulkhead fitting at the firewall and a short piece of coax in the cowl side BNC connector, then transition from the center conductor of the coax to your wire. The coax shield need not extend past the connector and is not connected to anything. The coax just makes it easy to use a BNC connector to disconnect the antenna for cowl removal.

If you have a ham friend have him/her check the antenna for resonance at 75 MHZ. In free air a ¼ wavelength antenna (as your's will be) at this frequency is 37.5 inches. If you don't have a ham friend to check, then just use 38" or so. This is really not critical for marker beacon use.

Carl Froehlich
RV-8A (375 hrs)
RV-10 (wings)


From: owner-rv-list-server(at)matronics.com (owner-rv-list-server(at)matronics.com) [mailto:owner-rv-list-server(at)matronics.com (owner-rv-list-server(at)matronics.com) ] On Behalf Of Donald Harker
Sent: Tuesday, December 11, 2007 9:44 PM
To: rv-list(at)matronics.com (rv-list(at)matronics.com)
Subject: Marker Beacon in lower cowl


Planning on glassing in a 40 " bare 22 gauge wire in bottom of 7A cowl for use as marker beacon antenna. One concern is that the antenna is not perfectly flat.

Anyone done this before?

Thanks

Don Harker
N767DH
Finishing
Quote:




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http://www.matronics.com/contribution


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[quote][b]

- The Matronics RV-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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