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Com Antenna Install

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lwhitlow

Joined: 15 Jan 2006
Posts: 76
Location: Valparaiso Indiana

Posted: Sat Apr 11, 2009 7:36 pm Post subject: Com Antenna Install

Hi All



Attached is a picture of my COM antenna. To be mounted in the reinforced portion of the turtledeck on the upper rear of the Baggage area on my Zenith 601XL



Question is How do I hook it up??  Crimp a ring terminal on to the center conductor of the RG-400 and attach that with the nut to the bottom of the antenna, and attach another ring terminal to the shield and connect it to WHERE???



Help me or gurus of the RF

Larry

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Com Antenna

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n8zg(at)mchsi.com
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Posted: Sun Apr 12, 2009 3:24 am Post subject: Com Antenna Install

Larry - 

It's not the best we know how to do, but if you're dead-set on this

device...



Strip the outer jacket off the RG-400 and un-braid the shield.  Pull the

shield wire to one side, twist and crimp on a terminal.  Attach the shield

to a screw thru the aircraft skin near the antenna base.



Antennas similar to the COMANT CI-122 are much more user-friendly.



neal



=====================

Hi All



Attached is a picture of my COM antenna. To be mounted in the reinforced

portion of the turtledeck on the upper rear of the Baggage area on my Zenith

601XL



Question is How do I hook it up??  Crimp a ring terminal on to the center

conductor of the RG-400 and attach that with the nut to the bottom of the

antenna, and attach another ring terminal to the shield and connect it to

WHERE???



Help me or gurus of the RF

Larry

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mike109g6(at)insideconnec
Guest

Posted: Sun Apr 12, 2009 7:14 am Post subject: Com Antenna Install

Larry,

The RG-400 has an insulated solid core wire that uses a particular connector 

as explained in the AeroElectric manual.  The antenna that you show uses a 

ring terminal for attachment.  Better ask Bob on this one.

Mike H



---

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ceengland(at)bellsouth.ne
Guest

Posted: Sun Apr 12, 2009 11:50 am Post subject: Com Antenna Install

The shield wire should connect to the skin (that will serve as your ground plane) somewhere close & convenient to the antenna. You could make your reinforcement plate big enough to bend a tab on one edge, or add a tab under one of the rivets, to bolt the shield eyelet to. Just be sure that you have good electrical contact from shield-eyelet-bolt-tab-doubler-skin. If you don't mind an extra connector showing, use a screw through the skin-ring terminal to reduce odds of ground loss.

Charlie

From: lwhitlow  <ldwhitlow(at)comcast.net>

To: aeroelectric-list(at)matronics.com

Sent: Saturday, April 11, 2009 10:36:40 PM

Subject: Com Antenna Install

 --> AeroElectric-List message posted by: "lwhitlow" <ldwhitlow(at)comcast.net (ldwhitlow(at)comcast.net)>

Hi All

Attached is a picture of my COM antenna. To be mounted in the reinforced portion of the turtledeck on the upper rear of the Baggage area on my Zenith 601XL

Question is How do I hook it up??  Crimp a ring terminal on to the center conductor of the RG-400 and attach that with the nut to the bottom of the antenna, and attach another ring terminal to the shield and connect it to WHERE???

Help me or gurus of the RF

Larry

Read this topic online here:

[url=http://forums.matronics.com/viewtopic.php?p 38744#238744]http://forums.matronics.com/viewtopic.php?p 38744#238744[/url]

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun Apr 12, 2009 6:08 pm Post subject: Com Antenna Install

At 10:36 PM 4/11/2009, you wrote:

 	  Quote: 	
		  



Hi All



Attached is a picture of my COM antenna. To be mounted in the 

reinforced portion of the turtledeck on the upper rear of the 

Baggage area on my Zenith 601XL



Question is How do I hook it up??  Crimp a ring terminal on to the 

center conductor of the RG-400 and attach that with the nut to the 

bottom of the antenna, and attach another ring terminal to the 

shield and connect it to WHERE???



Help me or gurus of the RF


	


   This style of antenna was used in QUANTITY at Cessna and

   other single engine aircraft way back when. By "way back"

   I mean the times when these radios were the best we knew

   how to do.

http://aeroelectric.com/Pictures/Radios/P1012765.JPG



http://aeroelectric.com/Pictures/Radios/P1012780.JPG



   The antennas fell in disfavor mostly because they were

   difficult to keep stationary. They would "spin" in the

   insulator and often break the center conductor connection.

   Secondly, they were labor intensive to install compared

   to their factory built descendants. About the time

   these radios . . .



http://aeroelectric.com/Pictures/Radios/P1012763.JPG



   were the best we knew how to do, the single whisker

   mounted on a ceramic feed-thru was pretty much

   history. You can still buy this style antenna. Several

   versions offer a large ring terminal to install under

   the skin and over the hole that mounts the antenna

   insulator. Definitely NOT gas-tight to the skin.

   If your kit came with this terminal, pitch the

   terminal.



   I've been fiddling with a DIY comm antenna fabrication

   technique that ends up with a base that looks like this.



   http://aeroelectric.com/Pictures/Antenna/DIY_Comm_Antenna.jpg



   The materials are common hardware and CB radio accessory

   store items. This design offers a coax connector to

   attache the feed line, good anti-rotation features by

   virtue of the two screws through grounding tabs and

   the opportunity to get a gas-tight ground connection

   (#8 screws tightened down really good).



   For your application, consider the technique shown

   here:



http://aeroelectric.com/Pictures/Antenna/Figure_13-8.pdf



   Prepare your coax connections thusly:



http://aeroelectric.com/articles/shldwire/shldwire.html



   Make the shortest practical connection between

   the antenna and coax . . . i.e. minimize length

   of exposed center conductor and braid pigtail.



   SWR of antenna installed thusly? Adequate. Performance?

   Also adequate. Cost of ownership? Remains to be seen.

   These have the potential for being more problematic

   than their modern factory built counterparts.

        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun Apr 12, 2009 6:09 pm Post subject: Com Antenna Install

At 02:45 PM 4/12/2009, you wrote:

 	  Quote: 	
		  The shield wire should connect to the skin (that will serve as your 

ground plane) somewhere close & convenient to the antenna.


	


  <snip>



 	  Quote: 	
		  If you don't mind an extra connector showing, use a screw through 

the skin-ring terminal to reduce odds of ground loss.



Charlie


	


    Right on!

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun Apr 12, 2009 6:09 pm Post subject: Com Antenna Install

At 10:12 AM 4/12/2009, you wrote:

 	  Quote: 	
		  

<mike109g6(at)insideconnect.net>



Larry,

The RG-400 has an insulated solid core wire that uses a particular 

connector as explained in the AeroElectric manual.  The antenna that 

you show uses a ring terminal for attachment.  Better ask Bob on this one.

Mike H


	


  Oh yeah. Larry, be sure to use RG400 for this

  install, it has a stranded center conductor.

  RG142 is identical in performance but has a

  solid center conductor.



  Thank's for reminding me Mike!

        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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