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Antenna for hand-held transceiver on panel

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craig(at)craigandjean.com
Guest

Posted: Fri Jun 09, 2006 8:43 am Post subject: Antenna for hand-held transceiver on panel

Like a lot of people I'm saving space on my panel to hang a hand-held

transceiver as a back-up radio. The question is what to do about the

antenna. The simple approach would be to just mount it such that the rubber

ducky antenna sits almost entirely above the glare shield. How well does

that work in terms of transmission and receiving performance?



Alternatively I'd wire the antenna to the main radio such that the lead

could be switched to the BNC on the top of the hand-held. So far the

simplest design (and the one with the least RF loss) that I can think of

would be a female BNC bulkhead connector which leads to the panel radio. The

lead from the antenna would end in a short pigtail of coax with a male BNC

connector. To switch radios you would move the pigtail from the BNC bulkhead

to the BNC on the top of the hand-held. Note that to minimize losses the

bulkhead connector would not be the type with a BNC female on both sides of

the panel. Instead the side inside of the panel crimps directly on to the

coax (Digikey ACX1032-ND, Amphenol 112505).



Most of these ideas come from

http://www.aeroelectric.com/articles/commtap/commtap.html



Comments? What other approaches have others taken?



-- Craig

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aerobubba(at)earthlink.ne
Guest

Posted: Sat Jun 10, 2006 3:31 am Post subject: Antenna for hand-held transceiver on panel

Hi Craig-



 

 	  Quote: 	
		  Comments? What other approaches have others taken?

 
	


I've got a permanently mounted socket / switch unit from iCom.  The panel

mount radio and antenna coax are permanently mounted to it, and I have a

length of feedline for the handheld that terminates in a plug.  If I should

need the handheld, all I do is plug it's feedline into the socket.  The

panel mount is disconnected from the antenna, and the handheld is now on

line.  Very neat and simple.  No making or breaking of BNC connex while

flying the plane.  



I got mine through Pacific coast avionics.   



Glen Matejcek

aerobubba(at)earthlink.net

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trigo(at)mail.telepac.pt
Guest

Posted: Sat Jun 10, 2006 4:12 am Post subject: Antenna for hand-held transceiver on panel

Glen

  

 I think I didn't quite understand your setup. Let  me ask.

  

 > 

 	  Quote: 	
		   I've got a permanently mounted  socket / switch unit from iCom.  

  
	


 You mean a power socket,  right?

  

 > The panel

 	  Quote: 	
		   mount radio and antenna coax  are permanently mounted to it, and I have a

 length of feedline for the  handheld that terminates in a plug.  If I should

 need the handheld,  all I do is plug it's feedline into the socket.  The

 panel mount is  disconnected from the antenna, and the handheld is now on

 line.   Very neat and simple.  No making or breaking of BNC connex while

  flying the plane.  

 


	


 You say "no making or breaking of BNC  connex while flying the plane", but you said " the panel mount (radio) is  disconnected from the antenna". Is it something like Bob has in the Aeroelectric  connection, a panel mounted antenna plug, or am I missing  something?

  

 Carlos

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brian

Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

Posted: Sat Jun 10, 2006 7:31 am Post subject: Antenna for hand-held transceiver on panel

On Jun 9, 2006, at 12:38 PM, Craig Payne wrote:



 	  Quote: 	
		   

 <craig(at)craigandjean.com>


	


 	  Quote: 	
		   ...simplest design (and the one with the least RF loss) that I can  

 think of

 would be a female BNC bulkhead connector which leads to the panel  

 radio. The

 lead from the antenna would end in a short pigtail of coax with a  

 male BNC

 connector. To switch radios you would move the pigtail from the BNC  

 bulkhead

 to the BNC on the top of the hand-held. Note that to minimize  

 losses the

 bulkhead connector would not be the type with a BNC female on both  

 sides of

 the panel. Instead the side inside of the panel crimps directly on  

 to the

 coax (Digikey ACX1032-ND, Amphenol 112505).


	


Don't worry about losses at 120MHz using multiple BNC connectors. You  

won't be able to measure, let alone perceive, the loss. If it is more  

convenient to terminate the coax in a male BNC and then use a dual- 

female bulkhead 'barrel' connector, do so.



Case in point, I always put a pair of male BNC connectors with a  

female barrel connector in-between in every coax to every radio,  

usually someplace convenient to get to. That makes it easy to  

temporarily insert test equipment in the line. The losses, even at  

transponder, DME, and GPS frequencies, are inconsequential.



Brian Lloyd                         361 Catterline Way

brian-yak AT lloyd DOT com          Folsom, CA 95630

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)



I fly because it releases my mind from the tyranny of petty things . . .

— Antoine de Saint-Exupéry

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_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery

Dale Ensing

Joined: 11 Jan 2006
Posts: 571
Location: Aero Plantation Weddington NC

Posted: Sat Jun 10, 2006 8:58 am Post subject: Antenna for hand-held transceiver on panel

...." a permanently mounted socket / switch unit from iCom..........a

length of feedline for the handheld that terminates in a plug.

Glen Matejcek



Glen,

Is there a Icom part number for this socket/switch/feedline? Checked their

web site and found nothing like your description.

Dale Ensing

do not achieve

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_________________
Dale Ensing
RV-6A
Aero Plantation
Weddington NC

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