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ptt isolation

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nodak

Joined: 16 Nov 2015
Posts: 3

Posted: Tue Nov 17, 2015 5:36 am Post subject: ptt isolation

What relays are recommended for pilot copilot  ptt isolation on flightline

fl760 transceivers. Thousands of relays are shown on suppliers web sites

making it hard to pick out a suitable one.

Thanks in advance.

Eugene Pilipanko

user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Tue Nov 17, 2015 4:17 pm Post subject: Re: ptt isolation

Search Mouser or Digikey for these relay characteristics:

Non-latching, 12VDC nominal coil voltage (13 or 14 OK), SPDT or DPDT, 1 amp contact rating, price less than $5.

  A panel mounted switch can be used to disable the copilot PTT.  A relay is needed to connect either the pilot or copilot mic.  Both mics should not be connected to the radio at the same time.

_________________
Joe Gores

ChuckGauthier(at)comcast.
Guest

Posted: Wed Nov 18, 2015 5:10 am Post subject: ptt isolation

I had a conversation with the vendor and was told that relays are the only way to have PTT Cutout.

I am putting the FL 760 in my panel and I didn’t want to use relays so I developed a way to avoid using relays and still accomplish the same results.

It requires using DPDT Momentary Push Button Switches for both Pilot and Co-Pilot/Pax.  I paid about $20-$25 for each of the switches.

Caveat:  Buyer Beware!  I have not finished installing it in my panel yet so the circuitry hasn’t been tested and confirmed, however, I took the schematic to an avionics shop for their review and they confirmed that it should work.

 

I’m attaching the schematics and info on the DPDT switches I used.

 

Good Luck.

 

Chuck Gauthier

Cleanex  N183SX

(Sonex with a Corvair engine)

Cell:      (360) 901-7934

ChuckGauthier(at)comcast.net (ChuckGauthier(at)comcast.net)

FL760_wiring_with_PTT_-_no_relay_needed.pdf

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DPDT_Momentary_PB,_Staco,_30262-18-C18P_.docx

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Nov 18, 2015 7:13 am Post subject: ptt isolation

At 07:36 AM 11/17/2015, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "nodak" <epilipanko(at)comcast.net>



 What relays are recommended for pilot copilot  ptt isolation on flightline

 fl760 transceivers. Thousands of relays are shown on suppliers web sites

 making it hard to pick out a suitable one.

 Thanks in advance.

 Eugene Pilipanko 	


  Joe's advice is solid but I'm curious as to how

  these would be used in your system. Can you

  share a link to the wiring diagrams that show

  the relays?



 

   Bob . . .

nuckolls.bob(at)aeroelect
Guest

Posted: Wed Nov 18, 2015 12:37 pm Post subject: ptt isolation

At 07:36 AM 11/17/2015, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "nodak" <epilipanko(at)comcast.net>



 What relays are recommended for pilot copilot  ptt isolation on flightline

 fl760 transceivers. Thousands of relays are shown on suppliers web sites

 making it hard to pick out a suitable one.

 Thanks in advance.Eugene Pilipanko 	


   Gene,



   When you say PTT isolation, what functionality

   are you seeking? The radio has two microphone

   inputs that are simultaneously active. This supports

   the intercom functionality.



   When you push the pilot's ptt, are you wanting to

   quiet the copilot's mic, disable the copilot's

   ptt, or both.



   When the copilot's ptt is activated, do you want

   that source to have priority over the radio . . .

   in other words, disable the pilot's ptt, microphone

   or both?



   Are you intending to use the built in intercom

   function?



 

   Bob . . .

nodak

Joined: 16 Nov 2015
Posts: 3

Posted: Thu Nov 19, 2015 9:17 am Post subject: Re: ptt isolation

I was wanting to disable the copilots transmit function when the pilots

ptt was activated & disabling the pilots transmit function when the

copilots ptt was activated. What I am trying to accomplish is not have

 both mics on when only  one ptt is activated. The flightline wiring 

diagram  lists a isolation relay board which is no longer available.

Thanks for the replies

Eugene Pilipanko

user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Thu Nov 19, 2015 3:01 pm Post subject: Re: ptt isolation

Here is a link to a wiring diagram showing how MicroAir uses two relays to connect the mics.

http://tinyurl.com/Microair-PTT

Eugene, are you going to use the intercom function of the radio?

_________________
Joe Gores

nodak

Joined: 16 Nov 2015
Posts: 3

Posted: Thu Nov 19, 2015 5:53 pm Post subject: Re: ptt isolation

I was planning on using the intercom feature. I am trying to get some 

information on how to wire the unit before I install it. It will be 

couple of months before I will do the installation.

Eugene Pilipanko

nuckolls.bob(at)aeroelect
Guest

Posted: Fri Nov 20, 2015 5:56 am Post subject: ptt isolation

At 07:53 PM 11/19/2015, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "nodak" <epilipanko(at)comcast.net>



 I was planning on using the intercom feature. I am trying to get some 

 information on how to wire the unit before I install it. It will be 

 couple of months before I will do the installation. 	


   Okay, let's talk about it a bit. I'm packing to

   go to Wichita today . . . got a garage door

   opener to install. We'll pick up this thread

   tomorrow.



 

   Bob . . .

nuckolls.bob(at)aeroelect
Guest

Posted: Fri Nov 20, 2015 5:58 am Post subject: ptt isolation

At 11:17 AM 11/19/2015, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "nodak" <epilipanko(at)comcast.net>



 I was wanting to disable the copilots transmit function when the pilots

 ptt was activated & disabling the pilots transmit function when the

 copilots ptt was activated. What I am trying to accomplish is not have

  both mics on when only  one ptt is activated. The flightline wiring 

 diagram  lists a isolation relay board which is no longer available.

 Thanks for the replies 	


   I believe Chuck's suggestion earlier this

   thread accomplishes a talker-priority access

   to the transmitter. You might study that

   a bit and see if it's suited to your 

   planning.



 

 

   Bob . . .

user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Fri Nov 20, 2015 8:25 am Post subject: Re: ptt isolation

Attached is a PTT circuit using two DPDT relays.  Both mics are normally connected for intercom use.  If one pilot presses her PTT switch, the other pilot's mic is disabled.  A disadvantage of this circuit is that if both PTT switches are pressed, both mics will be disabled.  Of course the pilot will realize this when the side tone goes quiet.

PTT Relays..pdf

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_________________
Joe Gores

wrmaxwell(at)bigpond.com
Guest

Posted: Fri Nov 20, 2015 12:47 pm Post subject: ptt isolation

Bt leaves the intercom         function to be addressed, methinks...

         

         Bill

       

     On 21/11/2015 12:57 AM, Robert L.       Nuckolls, III wrote:

     

      	  Quote: 	
		         At 11:17 AM 11/19/2015, you wrote:

               	  Quote: 	
		  -->           AeroElectric-List message           posted by: "nodak" <epilipanko(at)comcast.net> (epilipanko(at)comcast.net)

           

           I was wanting to disable the copilots transmit function when           the           pilots

           ptt was activated & disabling the pilots transmit function           when           the

           copilots ptt was activated. What I am trying to accomplish is           not           have

            both mics on when only  one ptt is activated. The flightline           wiring 

           diagram  lists a isolation relay board which is no longer           available.

           Thanks for the replies 	
       

         I believe Chuck's suggestion earlier this

         thread accomplishes a talker-priority access

         to the transmitter. You might study that

         a bit and see if it's suited to your 

         planning.

       

       

                

             Bob . . .

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