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Wiring 2 radios w/o audio panel

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sales(at)6440autoparts.co
Guest

Posted: Tue Aug 08, 2006 10:17 am Post subject: Wiring 2 radios w/o audio panel

Got a friend that wants to install a second radio in his C150 but does 

not want to install an audio panel. What kind of swicth or switches should 

he use to switch  between the radios to make this work ?



Randy

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brian

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

Posted: Tue Aug 08, 2006 1:32 pm Post subject: Wiring 2 radios w/o audio panel

On Aug 8, 2006, at 2:16 PM, 6440 Auto Parts wrote:



 	  Quote: 	
		   

 <sales(at)6440autoparts.com>



    Got a friend that wants to install a second radio in his C150  

 but does not want to install an audio panel. What kind of swicth or  

 switches should he use to switch  between the radios to make this  

 work ?


	


Does he want to use headphones, the loudspeaker, or both? Does he  

want to be able to listen to both radios at the same time or does he  

want to only hear the selected radio? Does he have an intercom? Once  

I have that information I can answer your question.



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

sales(at)6440autoparts.co
Guest

Posted: Tue Aug 08, 2006 2:41 pm Post subject: Wiring 2 radios w/o audio panel

Brian he wants to use headphones but no loudspeaker, he will 

only use one radio at a time, and he has a 2 place in panel intercom (he 

thinks it's Sigtronics but not sure without looking)



Thanks in advance Randy

---

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brian

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

Posted: Tue Aug 08, 2006 3:18 pm Post subject: Wiring 2 radios w/o audio panel

On Aug 8, 2006, at 6:39 PM, 6440 Auto Parts wrote:



 	  Quote: 	
		   

 <sales(at)6440autoparts.com>



            Brian he wants to use headphones but no loudspeaker, he  

 will only use one radio at a time, and he has a 2 place in panel  

 intercom (he thinks it's Sigtronics but not sure without looking)


	


Hmm. If it were me I would want to be able listen to comm 2 while  

using comm 1 to communicate. For example, I would want to listen to  

comm 2 to hear ATIS while continuing to monitor and communicate with  

ATC on comm 1.



And what about nav? Any of the radios have nav output?



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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bicyclop(at)pacbell.net
Guest

Posted: Tue Aug 08, 2006 4:41 pm Post subject: Wiring 2 radios w/o audio panel

Randy,



What I did was to use a DPST switch to move the mike and PTT leads (from

the intercom) between the 2 com radios. I labeled the switch XMIT and

put a Com 1 label on top and Com 2 underneath. I double check the switch

before transmitting to make sure I'm getting out on the radio I had

intended to use. If both Coms are at nearly the same frequency, I

sometimes get some weird feedback if I don't turn down the radio I'm not

transmitting on, but other than that it works fine.



I hooked the audio outputs together through 100 ohm resistors. I also

have a NAV radio hooked up the same way. Another guy I know didn't use

the resistors and it works fine for him. I use the individual volume

controls on the radios to listen to either or both. Very handy for

listening to ATIS or AWOS. I often leave Com 2 on guard or flight watch

on cross country flights and turn down if it interferes with flight

following and when entering the terminal area. 



I hooked up a failsafe headset jack directly to Com 1 in case the

intercom fails. I don't know if I needed to do that, but it seemed like

a good idea at the time. 



Pax,



Ed Holyoke



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sales(at)6440autoparts.co
Guest

Posted: Wed Aug 09, 2006 6:27 am Post subject: Wiring 2 radios w/o audio panel

Makes sense, let's set him up to listen both radio's. No NAV to be 

switched.



Randy



---

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brian

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

Posted: Wed Aug 09, 2006 10:29 am Post subject: Wiring 2 radios w/o audio panel

On Aug 9, 2006, at 10:28 AM, 6440 Auto Parts wrote:



 	  Quote: 	
		   

 <sales(at)6440autoparts.com>



          Makes sense, let's set him up to listen both radio's. No  

 NAV to be switched.


	


Someone else already replied and gave you the answer I would have.  

Use a DPDT switch to switch the mic and PTT output of the intercom  

between com1 and com2. Take the headphone outputs from com1, com2,  

nav1, and nav2 (if they exist) and route them to the intercom input  

(the intercom should have a headphone level input that would  

ordinarily come from the audio panel headphone output) each through a  

100 ohm resistor. Now you can use the individual volume controls on  

the radios to select audio source.



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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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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