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Icom External Antenna
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zeprep251(at)aol.com
Guest

Posted: Fri Aug 10, 2012 11:35 am Post subject: Icom External Antenna

This is actually covered in a March post from Boyd Young, but I need some more particulars if you don't mind.Looks like RG58, but what lengths do I start with before tuning with the SWR meter Boyd?

 Thanx G.Aman 

  

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jackinkeywest

Joined: 20 Mar 2012
Posts: 36
Location: Key West, FL

Posted: Fri Aug 10, 2012 12:03 pm Post subject: Icom External Antenna

For a 1/4 wave antenna in the VHF Airband (118.0-136.0 MHz) about 20" will put you in the middle of the spectrum (127.0 MHz).



Good luck.



Jack in Key West

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undoctor

Joined: 21 Oct 2008
Posts: 212
Location: Bethelhem, PA

Posted: Fri Aug 10, 2012 12:21 pm Post subject: Icom External Antenna

undoctor

Joined: 21 Oct 2008
Posts: 212
Location: Bethelhem, PA

Posted: Fri Aug 10, 2012 12:37 pm Post subject: Icom External Antenna

frankf(at)flying-models.c
Guest

Posted: Fri Aug 10, 2012 12:42 pm Post subject: Icom External Antenna

One other item I'd like to find out is the best and maybe easiest way to 

suppress ignition noise. Is it necessary to go the full gamut and use 

resistor plugs, cap, and ignition lead shielding? Will strobes also add 

to the noise?



Frank Fanelli



On 8/10/2012 4:01 PM, Lockamy, Jack CIV Atlantic Targets Marine Ops, 

AD.5.3.3 / Key West Det wrote:

[quote] For a 1/4 wave antenna in the VHF Airband (118.0-136.0 MHz) about 20" will put you in the middle of the spectrum (127.0 MHz).



 Good luck.



 Jack in Key West

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byoungplumbing(at)gmail.c
Guest

Posted: Fri Aug 10, 2012 3:51 pm Post subject: Icom External Antenna

This is  actually covered in a March post from Boyd Young, but I need some more  particulars if you don't mind.Looks like RG58, but what lengths do I start with  before tuning with the SWR meter Boyd?

Thanx G.Aman 



  

 i started plenty  long..  i think about 25 inches,   on both legs, the inner  connector, and braid...    my ham radio club has an antenna  analizer,  and i used it to figure the final legnths...  i will have  to measure the next time i go to the airport.

  

 boyd

  

 do not  archive

   [quote][b]

zeprep251(at)aol.com
Guest

Posted: Fri Aug 10, 2012 4:49 pm Post subject: Icom External Antenna

Thanks Boyd,

 I wondered if I could use the same SWR meter that I had for CB?

 G.A.

  

  

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zeprep251(at)aol.com
Guest

Posted: Fri Aug 10, 2012 4:54 pm Post subject: Icom External Antenna

Frank,

 I'm fighting the same issue with the Jabiru.Resistor plugs made no difference.Shutting the engine off helps the most.

 G.Aman

  

  

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Dana

Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA

Posted: Fri Aug 10, 2012 5:35 pm Post subject: Icom External Antenna

At 04:39 PM 8/10/2012, Frank Fanelli wrote:

  	  Quote: 	
		  --> Kolb-List message posted by: Frank Fanelli <frankf(at)flying-models.com>



 One other item I'd like to find out is the best and maybe easiest way to suppress ignition noise. Is it necessary to go the full gamut and use resistor plugs, cap, and ignition lead shielding? Will strobes also add to the noise? 	


 You can use resistor plugs, OR resistor caps.  Use both together and you can fry your ignition.  Shielding always helps.  For me, the combination of resistor plugs and the "ANL" setting (automatic noise limiter) on the radio is all I need.  Strobes can add noise, but I don't notice any from mine.



 -Dana

 

 --

 Congress shall make no law....What part of NO didn't you understand?   

    [quote][b]

byoungplumbing(at)gmail.c
Guest

Posted: Fri Aug 10, 2012 8:57 pm Post subject: Icom External Antenna

Thanks Boyd,

I wondered if I could use the same  SWR meter that I had for CB?

G.A.



 	  Quote: 	
		  >>>>>>>>>>>>>

  
	


 i am doubtfull....  cb is around 50  mhz,,,  aircraft centers at 127 mhz,,,    i dont think it  will cover that mhz spread.( check the owners/ tech  manual)  

  

    check   arrl.org,,  and  see if there is a ham radio club in your area,,  can probabley get some  help for free.

 \\\

  

  

 boyd

   [quote][b]

zeprep251(at)aol.com
Guest

Posted: Sat Aug 11, 2012 3:00 am Post subject: Icom External Antenna

Thanks again Boyd,will let you know how it works out. 

 G.A.    do not archive

  

  

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sat Aug 11, 2012 10:33 am Post subject: Icom External Antenna

Frank,

I'm fighting the same issue with the Jabiru.Resistor plugs

made no difference.Shutting the engine off helps the most.

G.Aman

 

A large "capacitor" about 21,000 mf always worked best for

me, 447, 582, and the 912 series engines.



john h

Del Norte, Colorado

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sat Aug 11, 2012 10:35 am Post subject: Icom External Antenna

You can use resistor plugs, OR resistor caps.  Use both

together and you can fry your ignition 

-Dana

--

 

Rotax 912 series engines use resistor plugs and caps.



john h

Del Norte, Colorado

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

zeprep251(at)aol.com
Guest

Posted: Sat Aug 11, 2012 4:13 pm Post subject: Icom External Antenna

John,Where is the best location for the capacitor?

 G.Aman

  

  

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undoctor

Joined: 21 Oct 2008
Posts: 212
Location: Bethelhem, PA

Posted: Sat Aug 11, 2012 6:07 pm Post subject: Icom External Antenna

Matt, Kolbers,

     

     I tried to send a reply twice a couple of days ago and both came     through with nothing in the message window.  

     I sent the same reply to myself and it came through OK, so it seems     there's a problem with the list.  I'm also 

     getting replys to subjects when I hadn't gotten the original post,     so I seem to be missing some posts.

     

     I was responding to Boyd about lots of static on his Icom; I was     unreadable to others with my Icom when 

     I transmitted, although I could hear others just fine.  I was told     that the problem was that when I pushed 

     the button on the Icom to talk I was transmitting both through the     Icom handheld mic as well as the mic

     on my headset, and that if I got a Push To Talk button it would only     pick up through my headset.  I bought

     a PTT and now it works as it should.

     

     FWIW

     Dave Kulp

     Bethlehem, PA

     FireFly 11DMK

     

     

     On 8/11/2012 8:10 PM, Gary Aman wrote:

     

     [quote]John,Where is the best location for             the capacitor?

             G.Aman

                      

           

           -----Original             Message-----

             From: John Hauck <jhauck(at)elmore.rr.com> (jhauck(at)elmore.rr.com)

             To: kolb-list <kolb-list(at)matronics.com> (kolb-list(at)matronics.com)

             Sent: Sat, Aug 11, 2012 2:33 pm

             Subject: RE: Icom External Antenna

             

                             	  Quote: 	
		  --> Kolb-List message posted by: "John Hauck" <jhauck(at)elmore.rr.com (jhauck(at)elmore.rr.com)>



 

Frank,

I'm fighting the same issue with the Jabiru.Resistor plugs

made no difference.Shutting the engine off helps the most.

G.Aman

 

A large "capacitor" about 21,000 mf always worked best for

me, 447, 582, and the 912 series engines.



john h

Del Norte, Colorado



get="_blank">http://www.matronics.com/Navigator?Kolb-List

tp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	
             

                        

                 	  Quote: 	
		  

	
     [b]

rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Sat Aug 11, 2012 6:42 pm Post subject: Icom External Antenna

What is the nature of your noise, a high pitched squeal is the alternator, a low pitched buzz is the ignition. The alternator will respond to the cap. Place it in the DC + line coming from you regulator going to the battery. Both sides of the wire are through the + terminal on the cap, the - terminal should go to engine ground. For ignition noise you need an inductor coil, you can probably find these from the custom car stereo shops. 



Rick Girard



On Sat, Aug 11, 2012 at 7:10 PM, Gary Aman <zeprep251(at)aol.com (zeprep251(at)aol.com)> wrote:

 [quote]John,Where is the best location for the capacitor?

  G.Aman

  

  

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_________________
The smallest miracle right in front of you is enough to make you happy....

byoungplumbing(at)gmail.c
Guest

Posted: Sun Aug 12, 2012 6:44 am Post subject: Icom External Antenna

What is the nature of your noise, a high pitched squeal is the alternator,  a low pitched buzz is the ignition. The alternator will respond to the cap.  Place it in the DC + line coming from you regulator going to the battery. Both  sides of the wire are through the + terminal on the cap, the - terminal should  go to engine ground. For ignition noise you need an inductor coil, you can  probably find these from the custom car stereo shops.  



 Rick Girard

 

 	  Quote: 	
		  >>>>>>>>>>>>>>>>>>

  
	


 good reply rick

  

 if you add a capacitor between the inductor coil  and the radio.  that will be like belt and suspenders.   and the  closer you can put this to the radio.  the less chance you will have for  inductance interference  getting into the wire after the  filters.

  

 boyd 

   [quote][b]

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sun Aug 12, 2012 3:01 pm Post subject: Icom External Antenna

John, Where is the best location for the capacitor?

G.Aman

 



Gary A/Kolbers:



On the 12VDC side of the regulator/Rectifier.  Attach to

positive and negative.



john h

mkIII

Del Norte, CO

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

phactor9

Joined: 16 Jun 2011
Posts: 78

Posted: Sun Aug 12, 2012 3:27 pm Post subject: Icom External Antenna

Isn't that the same as attaching it across the positive terminal of the key ignition and negative battery terminal (or ground)? So that the cap is across the battery positive and negative terminals, but only when the master is on?

  

 

--- On Sun, 8/12/12, John Hauck <jhauck(at)elmore.rr.com> wrote:



  	  Quote: 	
		  

From: John Hauck <jhauck(at)elmore.rr.com>

Subject: RE: Icom External Antenna

To: kolb-list(at)matronics.com

Date: Sunday, August 12, 2012, 6:59 PM



 --> Kolb-List message posted by: "John Hauck" <jhauck(at)elmore.rr.com (jhauck(at)elmore.rr.com)>

John, Where is the best location for the capacitor?

G.Aman





Gary A/Kolbers:



On the 12VDC side of the regulator/Rectifier.  Attach to

positive and negative.



john h

mkIIvigator?Kolb-List" sp;--> http://f=             - List Contributionsp;                     &bsp;--> 



	
 [quote][b]

Dana

Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA

Posted: Sun Aug 12, 2012 3:35 pm Post subject: Icom External Antenna

At 02:33 PM 8/11/2012, John Hauck wrote:

  	  Quote: 	
		  --> Kolb-List message posted by: "John Hauck" <jhauck(at)elmore.rr.com>



 

  You can use resistor plugs, OR resistor caps.  Use both

 together and you can fry your ignition 

 -Dana



 Rotax 912 series engines use resistor plugs and caps. 	


 I stand corrected.  I guess it's a matter of what the ignition is designed for.  It IS a problem on some 2-strokes, though.



 -Dana

 --

 Don't steal.  The IRS hates competition. 

    [quote][b]

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