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One antena two radios how

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bertrv6(at)gmail.com
Guest

Posted: Fri Jan 04, 2008 7:16 am Post subject: One antena two radios how

Hi:



I posted a message asking what is the best to have two radios, one

antena..



    I got one reply, with good info.   I would like to hear some other

comments.   Any one out there has two  radios, and one antena, what is the

best way to do this. If so,

     Pros and cons...



        thanks



           bertrv6a



 do not archive

shempdowling(at)gmail.com
Guest

Posted: Fri Jan 04, 2008 7:49 am Post subject: One antena two radios how

There was an article on this in Kitplanes a few years ago where they made a push and twist setup to disable one radio at a time.  I remember them saying you cant share an antenna.

  

 Shemp

 in dire need of a paint job



 

 On 1/4/08, Bert Murillo <bertrv6(at)gmail.com (bertrv6(at)gmail.com)> wrote: [quote]--> RV-List message posted by: "Bert Murillo" <bertrv6(at)gmail.com  (bertrv6(at)gmail.com)>



Hi:



I posted a message asking what is the best to have two radios, one

antena..



   I got one reply, with good info.   I would like to hear some other

comments.   Any one out there has two  radios, and one antena, what is the 



[b]

Gary.A.Sobek

Joined: 09 Jan 2006
Posts: 217
Location: SoCAL USA

Posted: Fri Jan 04, 2008 8:57 am Post subject: One antena two radios how

http://www.romeolima.com/RV8/IdeasProducts.htm#PRODUCT:%20%20King%20Antenna%20Adapter



Not sure which one but something like:

http://www.sinctech.com/catalog/family.aspx?id=104



Very few people go this route as it is not cost effective.  A 2nd antenna is less money.



My suggestion would be to to your LOCAL avionics shop and HIRE them for help.



Gary A. Sobek



"My Sanity" RV-6 N157GS O-320 Hartzell, 



2,073 + Flying Hours So. CA, USA 



_________________________________________________________________

Watch “Cause Effect,” a show about real people making a real difference

Gary.A.Sobek

Joined: 09 Jan 2006
Posts: 217
Location: SoCAL USA

Posted: Fri Jan 04, 2008 9:14 am Post subject: One antena two radios how

http://www.repeater-builder.com/antenna/w1gan-duplexer.pdf



The HAM 2 Meter band is FM just above the aviation AM band.  Stuff that works with their 2 meter band should work on our aviation frequencies. Be careful as some ham equipment call diplexers a duplexer when splitting 2 M and 70 cm signals. Diplexers that are used with repeaters SHOULD work. 



Gary A. Sobek



"My Sanity" RV-6 N157GS O-320 Hartzell, 



2,073 + Flying Hours So. CA, USA 

_________________________________________________________________

Watch “Cause Effect,” a show about real people making a real difference

dale1rv6(at)comcast.net
Guest

Posted: Fri Jan 04, 2008 9:16 am Post subject: One antena two radios how

I agree with Gary. Plus: Using one antenna for 2 radios negates the full redundancy benefit. If antenna, switch or final lead fails, both radios are useless. Why pay for a 2nd radio and not get full redundancy??? Please answer this question.  

Dale  

   

         

  

From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of RV6 Flyer

 Sent: Friday, January 04, 2008 11:50 AM

 To: rv-list(at)matronics.com

 Subject: RE: One antena two radios how  

  

   

http://www.romeolima.com/RV8/IdeasProducts.htm#PRODUCT:%20%20King%20Antenna%20Adapter

 

 Not sure which one but something like:

 http://www.sinctech.com/catalog/family.aspx?id=104

 

 Very few people go this route as it is not cost effective.  A 2nd antenna is less money.

 

 My suggestion would be to to your LOCAL avionics shop and HIRE them for help.

 

 Gary A. Sobek 

 "My Sanity" RV-6 N157GS O-320 Hartzell, 

 2,073 + Flying Hours So. CA, USA 

 

 

       

  

Watch “Cause Effect,” a show about real people making a real difference. [url=hw]Learn more[/url]    	  Quote: 	
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        [quote][b]

n5lp(at)warpdriveonline.c
Guest

Posted: Fri Jan 04, 2008 10:47 am Post subject: One antena two radios how

In amateur radio the term diplexer refers to a device that allows one  

antenna to be used on two different bands, not a very difficult  

task.  For repeater use with one antenna and one band a duplexer is  

used.  A duplexer is tuned to use only one transmit frequency and one  

receive frequency.  It has to do that because it uses filters to  

eliminate almost all of the transmit frequency from the receiver and  

to eliminate almost all other frequencies from the transmitter. It is  

critically tuned for those two frequencies only and will not work on  

any other frequencies.



Oh, and duplexers for VHF are huge, think around the size of a  

kitchen trash can, and they are also very heavy, typically using  

several large metal cylinders.



Larry Pardue



On Jan 4, 2008, at 10:07 AM, RV6 Flyer wrote:



 	  Quote: 	
		   http://www.repeater-builder.com/antenna/w1gan-duplexer.pdf



 The HAM 2 Meter band is FM just above the aviation AM band.  Stuff  

 that works with their 2 meter band should work on our aviation  

 frequencies. Be careful as some ham equipment call diplexers a  

 duplexer when splitting 2 M and 70 cm signals. Diplexers that are  

 used with repeaters SHOULD work.



 Gary A. Sobek

 "My Sanity" RV-6 N157GS O-320 Hartzell,

 2,073 + Flying Hours So. CA, USA

 Watch “Cause Effect,” a show about real people making a real  

 difference.

Tailgummer(at)aol.com
Guest

Posted: Fri Jan 04, 2008 4:33 pm Post subject: One antena two radios how

In a message dated 1/4/2008 9:00:44 A.M. Pacific Standard Time,  rv6_flyer(at)hotmail.com writes:

  	  Quote: 	
		  http://www.romeolima.com/RV8/IdeasProducts.htm#PRODUCT:%20%20King%20Antenna%20Adapter



Not    sure which one but something    like:

http://www.sinctech.com/catalog/family.aspx?id=104



Very few    people go this route as it is not cost effective.  A 2nd antenna is less    money.



My suggestion would be to to your LOCAL avionics shop and HIRE    them for help.



Gary A. Sobek 

"My Sanity" RV-6 N157GS O-320    Hartzell, 

2,073 + Flying Hours So. CA, USA 



      Watch â€œCause Effect,â€ a show about real people making a real difference. Learn more  	  Quote: 	
		  



="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List

.matronics.com/">http://forums.matronics.com

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



	
	


 

   I use the Icom equivalent for my HANDHELD (3rd radio...back-up com).  This required no special skills to install, and serves its purpose quite  elegantly.

  I found it VERY cost effective and serves me well. 

   John D'Onofrio   (Tailgummer(at)aol.com (Tailgummer(at)aol.com))



Start the year off right.  Easy ways to stay in shape in the new year. 

  [quote][b]

Doug Gray

Joined: 10 Jan 2006
Posts: 112
Location: Sydney, Australia

Posted: Fri Jan 04, 2008 5:34 pm Post subject: One antena two radios how

Mark Sletton previously posted a link to a very good solution, here it

is again.



http://www.aerocraftparts.com/ItemForm.aspx?item=SA-010&Category=0e9a8a4d-66d7-4057-a46d-e9f3baaa4e5a



BTW isn't adding a second antenna only slightly better (less risky to

the radio) than wiring the two antenna feedlines together?  Coupling

from one antenna transmitting into the second is very likely to torch

the receiver in the second.



Doug Gray

(another HAM...)

n5lp(at)warpdriveonline.c
Guest

Posted: Fri Jan 04, 2008 6:00 pm Post subject: One antena two radios how

On Jan 4, 2008, at 6:27 PM, Doug Gray wrote:



 	  Quote: 	
		  

 BTW isn't adding a second antenna only slightly better (less risky to

 the radio) than wiring the two antenna feedlines together?  Coupling

 from one antenna transmitting into the second is very likely to torch

 the receiver in the second.



The two antenna solution has been used very successfully for many  
	


decades.  Good to get the best separation possible.



Larry Pardue

carl.froehlich(at)cox.net
Guest

Posted: Fri Jan 04, 2008 7:05 pm Post subject: One antena two radios how

Close antennas (within reason), one transmitting while the other is

receiving, will degrade the receiving system while the other is

transmitting, but there is not sufficient energy transfer to do damage.



With sufficient spacing you can have the pilot talking on one radio while

the copilot is talking to someone else on the second radio.  Some audio

panels on the market support this set up (Garmin GMA 340 for example).

There is a Lancair at the airpark with both husband and wife retired airline

pilots.  They frequently operate this way to split up the communication load

during IFR.  This capability is not possible with the single antenna shared

between two radios system.



If you only plan on talking and receiving on one radio at a time, wide

spacing is not a critical factor. 



Carl Froehlich 

RV-8A (375 hrs)

RV-10 (wings)

KV4U



--

dav1111(at)erfwireless.ne
Guest

Posted: Sat Jan 05, 2008 3:50 am Post subject: One antena two radios how

I installed a Bob Archer splitter and during the first 150+  hours it worked great on a two radio one antenna install.  However  apparently the splitter went bad and to degraded the transmit on both radios to  the point that the tower could not understand my request of "ready to depart  35L"

  

 This was after getting clearance to taxi from ground to the  runway.  After doing a 180 to return to the ramp, the tower said "N710RV (I  have 12 inch letters) if you are departing Centennial and NOT returning you are  cleared to depart 35L"

  

 After returning to home base I removed the inline splitter and  either radio worked just fine on the single antenna.  I now have a second  antenna.

  

 Russ Daves

 N710RV - RV-10

 N65RV - RV-6A Sold

 N742PZ - RV-Co-Builder

 N____RV - RV-7 Waiting on Fuselage

    [quote][b]

gmcjetpilot

Joined: 04 Nov 2006
Posts: 170

Posted: Sat Jan 05, 2008 3:05 pm Post subject: One antena two radios how

 	  Quote: 	
		  From: Tailgummer(at)aol.com (Tailgummer(at)aol.com) 

Subject: Re: One antenna two radios how

  From Tailgummer's link this ITEM is what you need, 

and its $690.00

  http://www.aerocraftparts.com/ItemForm.aspx?item=CI601

There is no advantage of duplex off one antenna IMHO 

except the 0.30 mph drag you save at top speed. 

My situation is I have a #1 panel com. I can access the 

BNC connector on the floor and connect a coax jumper to 

my handheld if needed. Other wise my handheld uses its 

rubber duckie antenna & the audio is routed to the 

intercom. Its great for getting ATIS while #1 is on ATC. The 

handheld is temp mounted off the side of the panel, just 

  for reciving. If I want to transmit with it I have to connect 

  the  external antenna to get max range and than connect 

  the head set direct to the radio. This would be an emergency 

  if #1 failed.

A second antenna like a FOIL TAPE antenna in the wind 

screen, to improve the handhelds reception could be done 

with no drag penalty or long wing tip coax runs (cost and 

weight).

  I don't recommend a foil tape as a primary antenna for 

transmission & reception. ANY THING SHORT of a WHIP 

externally mounted 1/2 wave ground plane antenna is NOT 

going to be as good, ever compared to an internal antenna.

The rubber duckie does good job, especially for ATIS 20 

out. Hanging off the side of the panel, the antenna is just 

above the side rail. 

For two panel mounted VHF radios PUT in two antennas.

I fly Boeing aircraft and we have TWO HF radios into one 

antenna. However you have to select one radio to  transmit on. 

Also when you switch radios you have to KEY the mic and 

wait for it to switch & tune the antenna. You hear a tone 

for a few seconds. When the tone stops the switch and 

tuning has taken place. If you don't switch radios the 

switch/tune tone does not come back. If it detects a new 

radio or freq it will go through the switch tune process again. 

I'm going to guess the HF radio, duplex switcher & antenna 

cost more than our whole airplanes do.

  Go with a second antenna and be done with it.

  G

        [quote][b]

Tailgummer(at)aol.com
Guest

Posted: Sat Jan 05, 2008 7:38 pm Post subject: One antena two radios how

In a message dated 1/5/2008 3:07:09 P.M. Pacific Standard Time,  gmcjetpilot(at)yahoo.com writes:

  	  Quote: 	
		     >From: Tailgummer(at)aol.com (Tailgummer(at)aol.com) 

 	  Quote: 	
		  Subject: Re:    One antenna two radios how

    
	


   From Tailgummer's link this ITEM is what you need, 

and its    $690.00

    

   http://www.aerocraftparts.com/ItemForm.aspx?item=CI601

 

There    is no advantage of duplex off one antenna IMHO 

except the 0.30 mph drag    you save at top speed. 

 

My situation is I have a #1 panel com. I    can access the 

BNC connector on the floor and connect a coax jumper to    

my handheld if needed. Other wise my handheld uses its 

rubber duckie    antenna & the audio is routed to the 

intercom. Its great for getting    ATIS while #1 is on ATC. The 

handheld is temp mounted off the side of the    panel, just 

   for reciving. If I want to transmit with it I have to connect 

   the external antenna to get max range and than connect 

   the head set direct to the radio. This would be an emergency 

   if #1 failed.

 

A second antenna like a FOIL TAPE antenna in    the wind 

screen, to improve the handhelds reception could be done 

with    no drag penalty or long wing tip coax runs (cost and 

weight).

    

   I don't recommend a foil tape as a primary antenna for 

transmission    & reception. ANY THING SHORT of a WHIP 

externally mounted 1/2 wave    ground plane antenna is NOT 

going to be as good, ever compared to an    internal antenna.

 

The rubber duckie does good job, especially for    ATIS 20 

out. Hanging off the side of the panel, the antenna is just    

above the side rail. 

 

For two panel mounted VHF radios PUT in    two antennas.

 

I fly Boeing aircraft and we have TWO HF radios    into one 

antenna. However you have to select one radio to transmit on.    

Also when you switch radios you have to KEY the mic and 

wait for it to    switch & tune the antenna. You hear a tone 

for a few seconds.    When the tone stops the switch and 

tuning has taken place. If you don't    switch radios the 

switch/tune tone does not come back. If it detects a new    

radio or freq it will go through the switch tune process again.    

I'm going to guess the HF radio, duplex switcher & antenna    

cost more than our whole airplanes do.

    

   Go with a second antenna and be done with it.



   G

   

 	  Quote: 	
		  



="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List

.matronics.com/">http://forums.matronics.com

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



	
	


 

 Please allow me to clarify, Mr gmcjetpilot, but http://www.aerocraftparts.com/ItemForm.aspx?item=CI601

 was  not my link.  My post was with regard to using a HANDHELD as a  3rd (read: emergency backup) transceiver.  An  example is the ICOM "ANTSB" which sells for $69.95 from Chief aircraft (among  other sources):. http://www.chiefaircraft.com/cgi-bin/air/hazel.cgi/hzpi/u/HzSt02068SnM1JBhoe/hazel.cgi?action=serve&item=/Aircraft/Radios/Icom2.html   not the $690.00 as you quoted.

   This particular external antenna adapter  was reviewed by  Avionics West and recommended by them as an alternate method to extend the range  of the ICOM handheld:  http://www.avionicswest.com/portablevhfadapter.html#1115.

   MY particular radio setup includes a belly mounted bent whip (COM 1)  and a Bob Archer experimental antenna (COM 2)... which, by the way, works just  fine.  MY setup utilizes the external antenna adapter for my HANDHELD,  rather than installing yet one more bent whip (or other type) antenna.  I  can't imagine that for the kind of flying RV's do that any more redundancy is  really needed.

   My post was not to infer that using this type of external  antenna adapter was meant to be used instead of a dedicated second  antenna.



Start the year off right.  Easy ways to stay in shape in the new year. 

  [quote][b]

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